TY  - JOUR
AU  - Stojanović, Ksenija A.
AU  - Jovančićević, Branimir
AU  - Šajnović, Aleksandra
AU  - Sabo, Tibor
AU  - Vitorović, Dragomir K.
AU  - Schwarzbauer, Jan
AU  - Golovko, Anatoly
PY  - 2009
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/598
AB  - This paper is aimed at investigating the origin and geological history of the biodegraded Gaj (Serbia) crude oil, based on comparison of biomarkers, particularly alkylaromatics, in crude oil maltene fraction, with those in the liquid raw asphaltene pyrolysis products. The content of asphaltenes in crude oils being generally very low, expecting a higher yield of pyrolysate, pyrolysis of raw asphaltenes was also carried out in the presence of Pt(IV)- and Ru(III)-ions. The used metal ions demonstrated positive effects on the yields of total liquid pyrolysate and corresponding hydrocarbons. Occluded maltene and asphaltene pyrolysis products showed that metal ions had considerably stronger effect on maturation changes in naphthalene and phenanthrene rings than in polycyclic alkanes. The values of maturity parameters observed in maltenes and pyrolysates suggested this crude oil to have been expelled from the source before the "oil window" maximum. The investigated sample of the Gaj crude oil was shown to be in the 4th stage of bio-degradation scale and to have originated from source rocks poor in clays, most probably carbonates, with significant contribution of algae to oil precursor biomass, deposited under a stratified saline water column. (C) 2008 Elsevier Ltd. All rights reserved.
PB  - Elsevier Sci Ltd, Oxford
T2  - Fuel
T1  - Pyrolysis and Pt(IV)- and Ru(III)-ion catalyzed pyrolysis of asphaltenes in organic geochemical investigation of a biodegraded crude oil (Gaj, Serbia)
VL  - 88
IS  - 2
SP  - 287
EP  - 296
DO  - 10.1016/j.fuel.2008.09.014
ER  - 

@article{
author = "Stojanović, Ksenija A. and Jovančićević, Branimir and Šajnović, Aleksandra and Sabo, Tibor and Vitorović, Dragomir K. and Schwarzbauer, Jan and Golovko, Anatoly",
year = "2009",
abstract = "This paper is aimed at investigating the origin and geological history of the biodegraded Gaj (Serbia) crude oil, based on comparison of biomarkers, particularly alkylaromatics, in crude oil maltene fraction, with those in the liquid raw asphaltene pyrolysis products. The content of asphaltenes in crude oils being generally very low, expecting a higher yield of pyrolysate, pyrolysis of raw asphaltenes was also carried out in the presence of Pt(IV)- and Ru(III)-ions. The used metal ions demonstrated positive effects on the yields of total liquid pyrolysate and corresponding hydrocarbons. Occluded maltene and asphaltene pyrolysis products showed that metal ions had considerably stronger effect on maturation changes in naphthalene and phenanthrene rings than in polycyclic alkanes. The values of maturity parameters observed in maltenes and pyrolysates suggested this crude oil to have been expelled from the source before the "oil window" maximum. The investigated sample of the Gaj crude oil was shown to be in the 4th stage of bio-degradation scale and to have originated from source rocks poor in clays, most probably carbonates, with significant contribution of algae to oil precursor biomass, deposited under a stratified saline water column. (C) 2008 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Fuel",
title = "Pyrolysis and Pt(IV)- and Ru(III)-ion catalyzed pyrolysis of asphaltenes in organic geochemical investigation of a biodegraded crude oil (Gaj, Serbia)",
volume = "88",
number = "2",
pages = "287-296",
doi = "10.1016/j.fuel.2008.09.014"
}

Stojanović, K. A., Jovančićević, B., Šajnović, A., Sabo, T., Vitorović, D. K., Schwarzbauer, J.,& Golovko, A.. (2009). Pyrolysis and Pt(IV)- and Ru(III)-ion catalyzed pyrolysis of asphaltenes in organic geochemical investigation of a biodegraded crude oil (Gaj, Serbia). in Fuel
Elsevier Sci Ltd, Oxford., 88(2), 287-296.
https://doi.org/10.1016/j.fuel.2008.09.014

Stojanović KA, Jovančićević B, Šajnović A, Sabo T, Vitorović DK, Schwarzbauer J, Golovko A. Pyrolysis and Pt(IV)- and Ru(III)-ion catalyzed pyrolysis of asphaltenes in organic geochemical investigation of a biodegraded crude oil (Gaj, Serbia). in Fuel. 2009;88(2):287-296.
doi:10.1016/j.fuel.2008.09.014 .

Stojanović, Ksenija A., Jovančićević, Branimir, Šajnović, Aleksandra, Sabo, Tibor, Vitorović, Dragomir K., Schwarzbauer, Jan, Golovko, Anatoly, "Pyrolysis and Pt(IV)- and Ru(III)-ion catalyzed pyrolysis of asphaltenes in organic geochemical investigation of a biodegraded crude oil (Gaj, Serbia)" in Fuel, 88, no. 2 (2009):287-296,
https://doi.org/10.1016/j.fuel.2008.09.014 . .

TY  - JOUR
AU  - Šolević-Knudsen, Tatjana
AU  - Stojanović, Ksenija A.
AU  - Bojesen-Koefoed, J.
AU  - Nytoft, Hans Peter
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
PY  - 2008
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/920
AB  - Twenty five crude oil samples from Velebit oil-gas field (SE Pannonian Basin, Serbia) were investigated in order to define the depositional environment, lithology, thermal maturity and depth of burial of the corresponding source rocks. Saturated biomarkers (n-alkanes, isoprenoids, steranes and triterpanes) were determined using gas chromatography (GC) and gas chromatography-mass spectrometry-mass spectrometry (GC MS-MS). Source and maturity parameters were calculated from the distribution and abundance of biomarker compounds and principal component analysis (PCA) was used to interpret their relationships. The Velebit crude oils were generated from siliciclastic source rocks containing a mixture of terrestrial and marine organic matter that was deposited under a predominantly reducing environment, probably in the distal marine portion of a delta. Maturation parameters indicated significant thermal maturity corresponding to peak oil generation. Age-diagnostic biomarker ratios suggest that the source of Velebit oils may be Upper Cretaceous, older than most oils in the Pannonian Basin, which are generated from Tertiary sources. These source rocks are thought to be at a present-day depth of approximately 3000 m, within or in close proximity to, the oil field. (c) 2007 Elsevier Ltd. All rights reserved.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Organic Geochemistry
T1  - Origin of oils in the Velebit oil-gas field, SE Pannonian Basin, Serbia - Source rocks characterization based on biological marker distributions
VL  - 39
IS  - 1
SP  - 118
EP  - 134
DO  - 10.1016/j.orggeochem.2007.09.003
ER  - 

@article{
author = "Šolević-Knudsen, Tatjana and Stojanović, Ksenija A. and Bojesen-Koefoed, J. and Nytoft, Hans Peter and Jovančićević, Branimir and Vitorović, Dragomir K.",
year = "2008",
abstract = "Twenty five crude oil samples from Velebit oil-gas field (SE Pannonian Basin, Serbia) were investigated in order to define the depositional environment, lithology, thermal maturity and depth of burial of the corresponding source rocks. Saturated biomarkers (n-alkanes, isoprenoids, steranes and triterpanes) were determined using gas chromatography (GC) and gas chromatography-mass spectrometry-mass spectrometry (GC MS-MS). Source and maturity parameters were calculated from the distribution and abundance of biomarker compounds and principal component analysis (PCA) was used to interpret their relationships. The Velebit crude oils were generated from siliciclastic source rocks containing a mixture of terrestrial and marine organic matter that was deposited under a predominantly reducing environment, probably in the distal marine portion of a delta. Maturation parameters indicated significant thermal maturity corresponding to peak oil generation. Age-diagnostic biomarker ratios suggest that the source of Velebit oils may be Upper Cretaceous, older than most oils in the Pannonian Basin, which are generated from Tertiary sources. These source rocks are thought to be at a present-day depth of approximately 3000 m, within or in close proximity to, the oil field. (c) 2007 Elsevier Ltd. All rights reserved.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Organic Geochemistry",
title = "Origin of oils in the Velebit oil-gas field, SE Pannonian Basin, Serbia - Source rocks characterization based on biological marker distributions",
volume = "39",
number = "1",
pages = "118-134",
doi = "10.1016/j.orggeochem.2007.09.003"
}

Šolević-Knudsen, T., Stojanović, K. A., Bojesen-Koefoed, J., Nytoft, H. P., Jovančićević, B.,& Vitorović, D. K.. (2008). Origin of oils in the Velebit oil-gas field, SE Pannonian Basin, Serbia - Source rocks characterization based on biological marker distributions. in Organic Geochemistry
Pergamon-Elsevier Science Ltd, Oxford., 39(1), 118-134.
https://doi.org/10.1016/j.orggeochem.2007.09.003

Šolević-Knudsen T, Stojanović KA, Bojesen-Koefoed J, Nytoft HP, Jovančićević B, Vitorović DK. Origin of oils in the Velebit oil-gas field, SE Pannonian Basin, Serbia - Source rocks characterization based on biological marker distributions. in Organic Geochemistry. 2008;39(1):118-134.
doi:10.1016/j.orggeochem.2007.09.003 .

Šolević-Knudsen, Tatjana, Stojanović, Ksenija A., Bojesen-Koefoed, J., Nytoft, Hans Peter, Jovančićević, Branimir, Vitorović, Dragomir K., "Origin of oils in the Velebit oil-gas field, SE Pannonian Basin, Serbia - Source rocks characterization based on biological marker distributions" in Organic Geochemistry, 39, no. 1 (2008):118-134,
https://doi.org/10.1016/j.orggeochem.2007.09.003 . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Vrvić, Miroslav M.
AU  - Schwarzbauer, Jan
AU  - Wehner, Hermann
AU  - Scheeder, Georg
AU  - Vitorović, Dragomir K.
PY  - 2007
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/842
AB  - A review is given in this paper of the up-to-date results observed in differentiation and transformation studies on petroleum-type pollutants in underground and surface waters. Water and particulate matter derived from the locality of Pancevo Petroleum Refinery, Serbia (River Danube alluvial formations). It was shown that distributions of n-alkanes, steranes and triterpanes, and delta C-13(PDB) values of n-alkanes may successfully be used for qualitatively differentiating the petroleum-type pollutants from native organic matter in recent sedimentary formations. In underground waters, a petroleum-type pollutant is exposed to microbiological degradation which is manifested through relatively fast degradation of n-alkanes. Following an almost complete degradation of crude oil n-alkanes in underground water, the biosynthesis of novel, even carbon-number C-16-C-30 n-alkanes may be observed. It is shown that the n-alkane distribution observed in a petroleum-type pollutant may depend on the intensity of its previous interaction with water. The fate of petroleum-type pollutants in environmental waters may be predicted through laboratory simulative microbiological degradation experiments by using microorganism consortiums similar to those observed under relevant natural conditions, as well as on corresponding nutrient base.
PB  - Springer, Dordrecht
T2  - Water Air and Soil Pollution
T1  - Organic-geochemical differentiation of petroleum-type pollutants and study of their fate in Danube alluvial sediments and corresponding water (Pancevo Oil Refinery, Serbia)
VL  - 183
IS  - 1-4
SP  - 225
EP  - 238
DO  - 10.1007/s11270-007-9371-7
ER  - 

@article{
author = "Jovančićević, Branimir and Vrvić, Miroslav M. and Schwarzbauer, Jan and Wehner, Hermann and Scheeder, Georg and Vitorović, Dragomir K.",
year = "2007",
abstract = "A review is given in this paper of the up-to-date results observed in differentiation and transformation studies on petroleum-type pollutants in underground and surface waters. Water and particulate matter derived from the locality of Pancevo Petroleum Refinery, Serbia (River Danube alluvial formations). It was shown that distributions of n-alkanes, steranes and triterpanes, and delta C-13(PDB) values of n-alkanes may successfully be used for qualitatively differentiating the petroleum-type pollutants from native organic matter in recent sedimentary formations. In underground waters, a petroleum-type pollutant is exposed to microbiological degradation which is manifested through relatively fast degradation of n-alkanes. Following an almost complete degradation of crude oil n-alkanes in underground water, the biosynthesis of novel, even carbon-number C-16-C-30 n-alkanes may be observed. It is shown that the n-alkane distribution observed in a petroleum-type pollutant may depend on the intensity of its previous interaction with water. The fate of petroleum-type pollutants in environmental waters may be predicted through laboratory simulative microbiological degradation experiments by using microorganism consortiums similar to those observed under relevant natural conditions, as well as on corresponding nutrient base.",
publisher = "Springer, Dordrecht",
journal = "Water Air and Soil Pollution",
title = "Organic-geochemical differentiation of petroleum-type pollutants and study of their fate in Danube alluvial sediments and corresponding water (Pancevo Oil Refinery, Serbia)",
volume = "183",
number = "1-4",
pages = "225-238",
doi = "10.1007/s11270-007-9371-7"
}

Jovančićević, B., Vrvić, M. M., Schwarzbauer, J., Wehner, H., Scheeder, G.,& Vitorović, D. K.. (2007). Organic-geochemical differentiation of petroleum-type pollutants and study of their fate in Danube alluvial sediments and corresponding water (Pancevo Oil Refinery, Serbia). in Water Air and Soil Pollution
Springer, Dordrecht., 183(1-4), 225-238.
https://doi.org/10.1007/s11270-007-9371-7

Jovančićević B, Vrvić MM, Schwarzbauer J, Wehner H, Scheeder G, Vitorović DK. Organic-geochemical differentiation of petroleum-type pollutants and study of their fate in Danube alluvial sediments and corresponding water (Pancevo Oil Refinery, Serbia). in Water Air and Soil Pollution. 2007;183(1-4):225-238.
doi:10.1007/s11270-007-9371-7 .

Jovančićević, Branimir, Vrvić, Miroslav M., Schwarzbauer, Jan, Wehner, Hermann, Scheeder, Georg, Vitorović, Dragomir K., "Organic-geochemical differentiation of petroleum-type pollutants and study of their fate in Danube alluvial sediments and corresponding water (Pancevo Oil Refinery, Serbia)" in Water Air and Soil Pollution, 183, no. 1-4 (2007):225-238,
https://doi.org/10.1007/s11270-007-9371-7 . .

TY  - JOUR
AU  - Stojanović, Ksenija A.
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
AU  - Golovko, Yulia
AU  - Pevneva, Galina
AU  - Golovko, Anatoly
PY  - 2007
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/903
AB  - Twenty three crude oils from the Serbian part of the Pannonian Basin (14 from the Vojvodina Province and 9 from the Drmno Depression) were investigated, aimed at an evaluation of oil-oil maturity correlation parameters based on the distribution and abundance of saturated biomarkers and alkylarene constituents. Factor and cluster analyses were used for this purpose. Factor analyses using varimax rotation were first run separately, i.e., of maturity parameters based on the abundance of (a) n-alkanes and isoprenoids, (b) steranes and triterpanes, (c) alkylnaphthalenes, and (d) alkylphenanthrenes. These analyses yielded 9 important "maturity factors". Eight of them, showing higher than 30 % of variance, were further involved in another factor analysis, as well as in cluster analysis using the Ward method. In this way, all maturity parameters based on saturated biomarkers and alkylarenes were evaluated and ranged, considering the fact that the observed factors represented their linear combinations. The results showed that in the correlation of crude oils from the Serbian part of the Pannonian Basin, the most important were maturity parameters based on isomerization reactions involving one methyl group in thermodynamically less stable alpha-methylnaphthalenes, ethylnaphthalenes, dimethylnaphthalenes and methylphenanthrenes, and their change into more stable isomers with the methyl group in the beta-position in the aromatic ring. Processes constituting high loadings factor 2 and factor 3 parameters were also defined. Hierarchy between the "factors" and parameters were controlled, and approved, by cluster analysis using the Ward method. Finally, the investigated crude oils were correlated by factor and cluster analyses, using all the important "maturity factors". Differences in maturity were observed between the Vojvodina and Drmno Depression crude oils, as well as between oils originating from South Banat, North Banat and the Velebit oil field (Vojvodina locality).
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Evaluation of saturated and aromatic hydrocarbons oil-oil maturity correlation parameters (SE Pannonian Basin, Serbia)
VL  - 72
IS  - 12
SP  - 1237
EP  - 1254
DO  - 10.2298/JSC0712237S
ER  - 

@article{
author = "Stojanović, Ksenija A. and Jovančićević, Branimir and Vitorović, Dragomir K. and Golovko, Yulia and Pevneva, Galina and Golovko, Anatoly",
year = "2007",
abstract = "Twenty three crude oils from the Serbian part of the Pannonian Basin (14 from the Vojvodina Province and 9 from the Drmno Depression) were investigated, aimed at an evaluation of oil-oil maturity correlation parameters based on the distribution and abundance of saturated biomarkers and alkylarene constituents. Factor and cluster analyses were used for this purpose. Factor analyses using varimax rotation were first run separately, i.e., of maturity parameters based on the abundance of (a) n-alkanes and isoprenoids, (b) steranes and triterpanes, (c) alkylnaphthalenes, and (d) alkylphenanthrenes. These analyses yielded 9 important "maturity factors". Eight of them, showing higher than 30 % of variance, were further involved in another factor analysis, as well as in cluster analysis using the Ward method. In this way, all maturity parameters based on saturated biomarkers and alkylarenes were evaluated and ranged, considering the fact that the observed factors represented their linear combinations. The results showed that in the correlation of crude oils from the Serbian part of the Pannonian Basin, the most important were maturity parameters based on isomerization reactions involving one methyl group in thermodynamically less stable alpha-methylnaphthalenes, ethylnaphthalenes, dimethylnaphthalenes and methylphenanthrenes, and their change into more stable isomers with the methyl group in the beta-position in the aromatic ring. Processes constituting high loadings factor 2 and factor 3 parameters were also defined. Hierarchy between the "factors" and parameters were controlled, and approved, by cluster analysis using the Ward method. Finally, the investigated crude oils were correlated by factor and cluster analyses, using all the important "maturity factors". Differences in maturity were observed between the Vojvodina and Drmno Depression crude oils, as well as between oils originating from South Banat, North Banat and the Velebit oil field (Vojvodina locality).",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Evaluation of saturated and aromatic hydrocarbons oil-oil maturity correlation parameters (SE Pannonian Basin, Serbia)",
volume = "72",
number = "12",
pages = "1237-1254",
doi = "10.2298/JSC0712237S"
}

Stojanović, K. A., Jovančićević, B., Vitorović, D. K., Golovko, Y., Pevneva, G.,& Golovko, A.. (2007). Evaluation of saturated and aromatic hydrocarbons oil-oil maturity correlation parameters (SE Pannonian Basin, Serbia). in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 72(12), 1237-1254.
https://doi.org/10.2298/JSC0712237S

Stojanović KA, Jovančićević B, Vitorović DK, Golovko Y, Pevneva G, Golovko A. Evaluation of saturated and aromatic hydrocarbons oil-oil maturity correlation parameters (SE Pannonian Basin, Serbia). in Journal of the Serbian Chemical Society. 2007;72(12):1237-1254.
doi:10.2298/JSC0712237S .

Stojanović, Ksenija A., Jovančićević, Branimir, Vitorović, Dragomir K., Golovko, Yulia, Pevneva, Galina, Golovko, Anatoly, "Evaluation of saturated and aromatic hydrocarbons oil-oil maturity correlation parameters (SE Pannonian Basin, Serbia)" in Journal of the Serbian Chemical Society, 72, no. 12 (2007):1237-1254,
https://doi.org/10.2298/JSC0712237S . .

TY  - JOUR
AU  - Stojanović, Ksenija A.
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
AU  - Pevneva, G. S.
AU  - Golovko, Ju. A.
AU  - Golovko, A. K.
PY  - 2007
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/864
AB  - Aiming at improved classification of crude oils, naphthalene and phenanthrene isomerization and dealkylation processes were considered in detail as a possible basis to select new maturation parameters. Crude oils originating from the Banat depression (Southeastern Pannonian Basin, Serbia) were used as objects of our study. Four new maturation parameters are proposed in this paper. Two of them are based on dimethylnaphthalene (DMN) and trimethylnaphthalene (TMN) isomerization reactions: DNx = (1,3-DMN + 1,6-DMN)/(1,4-DMN + 1,5-DMN) and TNy = (1,3,6-TMN + 1,3,7-TMN)/(1,3,5-TMN + 1,4,6-TMN). The other two are based on demethylation of dimethyl-and trimethylphenanthrenes (DMP and TMP) into corresponding methylphenanthrenes (MP): MDR = Sigma MP/Sigma DMP and MTR = Sigma MP/Sigma TMP. The new parameters' advantageous applicability was demonstrated by factor analysis, comparing them with maturation parameters known from literature.
PB  - Maik Nauka/Interperiodica/Springer, New York
T2  - Geochemistry International
T1  - New maturation parameters based on naphthalene and phenanthrene isomerization and dealkylation processes aimed at improved classification of crude oils (Southeastern Pannonian Basin, Serbia)
VL  - 45
IS  - 8
SP  - 781
EP  - 797
DO  - 10.1134/S0016702907080058
ER  - 

@article{
author = "Stojanović, Ksenija A. and Jovančićević, Branimir and Vitorović, Dragomir K. and Pevneva, G. S. and Golovko, Ju. A. and Golovko, A. K.",
year = "2007",
abstract = "Aiming at improved classification of crude oils, naphthalene and phenanthrene isomerization and dealkylation processes were considered in detail as a possible basis to select new maturation parameters. Crude oils originating from the Banat depression (Southeastern Pannonian Basin, Serbia) were used as objects of our study. Four new maturation parameters are proposed in this paper. Two of them are based on dimethylnaphthalene (DMN) and trimethylnaphthalene (TMN) isomerization reactions: DNx = (1,3-DMN + 1,6-DMN)/(1,4-DMN + 1,5-DMN) and TNy = (1,3,6-TMN + 1,3,7-TMN)/(1,3,5-TMN + 1,4,6-TMN). The other two are based on demethylation of dimethyl-and trimethylphenanthrenes (DMP and TMP) into corresponding methylphenanthrenes (MP): MDR = Sigma MP/Sigma DMP and MTR = Sigma MP/Sigma TMP. The new parameters' advantageous applicability was demonstrated by factor analysis, comparing them with maturation parameters known from literature.",
publisher = "Maik Nauka/Interperiodica/Springer, New York",
journal = "Geochemistry International",
title = "New maturation parameters based on naphthalene and phenanthrene isomerization and dealkylation processes aimed at improved classification of crude oils (Southeastern Pannonian Basin, Serbia)",
volume = "45",
number = "8",
pages = "781-797",
doi = "10.1134/S0016702907080058"
}

Stojanović, K. A., Jovančićević, B., Vitorović, D. K., Pevneva, G. S., Golovko, Ju. A.,& Golovko, A. K.. (2007). New maturation parameters based on naphthalene and phenanthrene isomerization and dealkylation processes aimed at improved classification of crude oils (Southeastern Pannonian Basin, Serbia). in Geochemistry International
Maik Nauka/Interperiodica/Springer, New York., 45(8), 781-797.
https://doi.org/10.1134/S0016702907080058

Stojanović KA, Jovančićević B, Vitorović DK, Pevneva GS, Golovko JA, Golovko AK. New maturation parameters based on naphthalene and phenanthrene isomerization and dealkylation processes aimed at improved classification of crude oils (Southeastern Pannonian Basin, Serbia). in Geochemistry International. 2007;45(8):781-797.
doi:10.1134/S0016702907080058 .

Stojanović, Ksenija A., Jovančićević, Branimir, Vitorović, Dragomir K., Pevneva, G. S., Golovko, Ju. A., Golovko, A. K., "New maturation parameters based on naphthalene and phenanthrene isomerization and dealkylation processes aimed at improved classification of crude oils (Southeastern Pannonian Basin, Serbia)" in Geochemistry International, 45, no. 8 (2007):781-797,
https://doi.org/10.1134/S0016702907080058 . .

TY  - JOUR
AU  - Stojanović, Ksenija A.
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
AU  - Golovko, Julia
AU  - Pevneva, Galina
AU  - Golovko, Anatoly
PY  - 2007
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/822
AB  - Hierarchy of triterpane, sterane, naphthalene and phenanthrene maturation parameters in oil-source rock correlations (Drinno depression, southeastern part of the Pannonian Basin, Serbia and Montenegro) was evaluated. Different triterpane and sterane parameters were found to be very similar in all investigated samples. Phenanthrene and naphthalene maturation parameters demonstrated much less uniformity, and thus higher applicability. In order to establish a detailed hierarchy of these maturation parameters, the factor analysis was used. Parameters based on isomerization reactions (alpha - gt beta) of methylnaphthatenes and methylphenanthrenes, having high loadings, defined the statistically most significant factor 1. Parameters based on dealkylation processes of dimethyl- and trimethylphenanthrenes into methylphenanthrenes, having extremely high loadings values, determined factor 2. In the last significant, factor 3, high loadings were observed with triterpane and sterane parameters. The factor analysis involving just the phenanthrene and naphthalene isomerization parameters, classified methylphenanthrene isomerization parameters into factor 1. Among the naphthalene isomerization maturation parameters a certain hierarchy was also observed, which depended on whether the parameters represented isomer ratios which differed on the position of one or two alkyl groups. General conclusion based on factor analysis is in agreement with theoretical presumptions concerning the transformations of phenanthrene and naphthalene isomers. (c) 2006 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Petroleum Science and Engineering
T1  - Hierarchy of maturation parameters in oil-source rock correlations. case study: Drmno depression, southeastern Pannonian Basin, Serbia and Montenegro
VL  - 55
IS  - 3-4
SP  - 237
EP  - 251
DO  - 10.1016/j.petrol.2006.07.009
ER  - 

@article{
author = "Stojanović, Ksenija A. and Jovančićević, Branimir and Vitorović, Dragomir K. and Golovko, Julia and Pevneva, Galina and Golovko, Anatoly",
year = "2007",
abstract = "Hierarchy of triterpane, sterane, naphthalene and phenanthrene maturation parameters in oil-source rock correlations (Drinno depression, southeastern part of the Pannonian Basin, Serbia and Montenegro) was evaluated. Different triterpane and sterane parameters were found to be very similar in all investigated samples. Phenanthrene and naphthalene maturation parameters demonstrated much less uniformity, and thus higher applicability. In order to establish a detailed hierarchy of these maturation parameters, the factor analysis was used. Parameters based on isomerization reactions (alpha - gt beta) of methylnaphthatenes and methylphenanthrenes, having high loadings, defined the statistically most significant factor 1. Parameters based on dealkylation processes of dimethyl- and trimethylphenanthrenes into methylphenanthrenes, having extremely high loadings values, determined factor 2. In the last significant, factor 3, high loadings were observed with triterpane and sterane parameters. The factor analysis involving just the phenanthrene and naphthalene isomerization parameters, classified methylphenanthrene isomerization parameters into factor 1. Among the naphthalene isomerization maturation parameters a certain hierarchy was also observed, which depended on whether the parameters represented isomer ratios which differed on the position of one or two alkyl groups. General conclusion based on factor analysis is in agreement with theoretical presumptions concerning the transformations of phenanthrene and naphthalene isomers. (c) 2006 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Petroleum Science and Engineering",
title = "Hierarchy of maturation parameters in oil-source rock correlations. case study: Drmno depression, southeastern Pannonian Basin, Serbia and Montenegro",
volume = "55",
number = "3-4",
pages = "237-251",
doi = "10.1016/j.petrol.2006.07.009"
}

Stojanović, K. A., Jovančićević, B., Vitorović, D. K., Golovko, J., Pevneva, G.,& Golovko, A.. (2007). Hierarchy of maturation parameters in oil-source rock correlations. case study: Drmno depression, southeastern Pannonian Basin, Serbia and Montenegro. in Journal of Petroleum Science and Engineering
Elsevier Science Bv, Amsterdam., 55(3-4), 237-251.
https://doi.org/10.1016/j.petrol.2006.07.009

Stojanović KA, Jovančićević B, Vitorović DK, Golovko J, Pevneva G, Golovko A. Hierarchy of maturation parameters in oil-source rock correlations. case study: Drmno depression, southeastern Pannonian Basin, Serbia and Montenegro. in Journal of Petroleum Science and Engineering. 2007;55(3-4):237-251.
doi:10.1016/j.petrol.2006.07.009 .

Stojanović, Ksenija A., Jovančićević, Branimir, Vitorović, Dragomir K., Golovko, Julia, Pevneva, Galina, Golovko, Anatoly, "Hierarchy of maturation parameters in oil-source rock correlations. case study: Drmno depression, southeastern Pannonian Basin, Serbia and Montenegro" in Journal of Petroleum Science and Engineering, 55, no. 3-4 (2007):237-251,
https://doi.org/10.1016/j.petrol.2006.07.009 . .

TY  - JOUR
AU  - Šolević-Knudsen, Tatjana
AU  - Stojanović, Ksenija A.
AU  - Jovančićević, Branimir
AU  - Mandić, Gorica
AU  - Schwarzbauer, Jan
AU  - Vitorović, Dragomir K.
PY  - 2006
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/812
AB  - Twenty-five crude oils originating from the Velebit oil field (SE Pannonian Basin), the most important oil field in Serbia, were investigated. Saturated biomarkers (n-alkanes, isoprenoids, steranes and triterpanes) were analyzed by gas chromatography-mass spectrometry (GC-MS). Based on the distribution and abundance of these compounds, a large number of source and maturation parameters were calculated, particularly those most often used in correlation studies of oils. The examined samples were classified according to their origin and level of thermal maturity using factor, cluster and discriminant analyses. According to the source and maturation parameters, combined factor and cluster analyses using the Ward method enabled the categorization of the investigated oils into three groups. The cluster Ward analysis was shown to be of greater susceptibility and reliability. However, in addition to the two aforementioned methods, K-Means cluster analysis and discriminant analysis were shown to be necessary for a more precise and detailed categorization in the case of a large number of samples in one group. Consequently, it was concluded that factor and cluster K-Means and Ward analyses can generally be used for the interpretation of saturated biomarkers in correlation studies of oils, but the observed results have to be checked, i.e., confirmed by discriminant analysis.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Multivariate statistical methods applied to interpretation of saturated biomarkers (Velebit oil field, SE Pannonian Basin, Serbia)
VL  - 71
IS  - 7
SP  - 745
EP  - 769
DO  - 10.2298/JSC0607745S
ER  - 

@article{
author = "Šolević-Knudsen, Tatjana and Stojanović, Ksenija A. and Jovančićević, Branimir and Mandić, Gorica and Schwarzbauer, Jan and Vitorović, Dragomir K.",
year = "2006",
abstract = "Twenty-five crude oils originating from the Velebit oil field (SE Pannonian Basin), the most important oil field in Serbia, were investigated. Saturated biomarkers (n-alkanes, isoprenoids, steranes and triterpanes) were analyzed by gas chromatography-mass spectrometry (GC-MS). Based on the distribution and abundance of these compounds, a large number of source and maturation parameters were calculated, particularly those most often used in correlation studies of oils. The examined samples were classified according to their origin and level of thermal maturity using factor, cluster and discriminant analyses. According to the source and maturation parameters, combined factor and cluster analyses using the Ward method enabled the categorization of the investigated oils into three groups. The cluster Ward analysis was shown to be of greater susceptibility and reliability. However, in addition to the two aforementioned methods, K-Means cluster analysis and discriminant analysis were shown to be necessary for a more precise and detailed categorization in the case of a large number of samples in one group. Consequently, it was concluded that factor and cluster K-Means and Ward analyses can generally be used for the interpretation of saturated biomarkers in correlation studies of oils, but the observed results have to be checked, i.e., confirmed by discriminant analysis.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Multivariate statistical methods applied to interpretation of saturated biomarkers (Velebit oil field, SE Pannonian Basin, Serbia)",
volume = "71",
number = "7",
pages = "745-769",
doi = "10.2298/JSC0607745S"
}

Šolević-Knudsen, T., Stojanović, K. A., Jovančićević, B., Mandić, G., Schwarzbauer, J.,& Vitorović, D. K.. (2006). Multivariate statistical methods applied to interpretation of saturated biomarkers (Velebit oil field, SE Pannonian Basin, Serbia). in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 71(7), 745-769.
https://doi.org/10.2298/JSC0607745S

Šolević-Knudsen T, Stojanović KA, Jovančićević B, Mandić G, Schwarzbauer J, Vitorović DK. Multivariate statistical methods applied to interpretation of saturated biomarkers (Velebit oil field, SE Pannonian Basin, Serbia). in Journal of the Serbian Chemical Society. 2006;71(7):745-769.
doi:10.2298/JSC0607745S .

Šolević-Knudsen, Tatjana, Stojanović, Ksenija A., Jovančićević, Branimir, Mandić, Gorica, Schwarzbauer, Jan, Vitorović, Dragomir K., "Multivariate statistical methods applied to interpretation of saturated biomarkers (Velebit oil field, SE Pannonian Basin, Serbia)" in Journal of the Serbian Chemical Society, 71, no. 7 (2006):745-769,
https://doi.org/10.2298/JSC0607745S . .

TY  - JOUR
AU  - Sainovic, A
AU  - Stojanović, Ksenija A.
AU  - Filopovic, I
AU  - Cvetković, Olga
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
PY  - 2004
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/665
AB  - The factor analysis, used in this work for the interpretation of maturation parameters observed in an exploration study of a group of surface sediments of diverse age originating from different localities in Serbia, resulted in two significant factors. Factor 1 involved parameters related mainly to maturation changes within the aliphatic chains of the organic matter and factor 2 involved parameters based mainly on changes in the terpane and sterane rings. A statistically significant inversely proportional linear dependence between factors 1 and 2 was observed with older, in contrast to younger sediments, suggesting that the reactions of the aliphatic chains in the older sediments did not occur simultaneously with the reactions in the rings and, also, that the older surface sediments examined in this study may be characterized by a degree of thermal maturity corresponding to changes in the biomarker sterane and terpane rings, while the younger sediments by intensive changes in the aliphatic chains.
AB  - U ovom radu faktorska analiza je primenjena za interpretaciju osam maturacionih parametara izračunatih u okviru eksploracionog istraživanja trinaest uzoraka površinskih sedimenata različite starosti, uzetih sa različitih lokaliteta u Srbiji. Analizom su utvrđena dva značajna faktora. Faktor 1 je obuhvatio parametre zasnovane pretežno na maturacionim promenama alifatičnih nizova, a faktor 2 parametre zasnovane uglavnom na promenama u terpanskim i steranskim prstenovima. Statistički značajna, obrnuto proporcionalna, linearna zavisnost između faktora 1 i 2 utvrđena je kod starijih, za razliku od mlađih sedimenata.Na osnovu toga pretpostavljeno je da se kod starih sedimenata reakcije u alifatičnom nizu i prstenu nisu odigravale istovremeno, i takođe, da se stariji sedimenti ispitivani u ovom radu mogu okarakterisati stepenom termičke zrelosti koji odgovara promenama u biomarkerskim steranskim i terpanskim prstenovima, a mlađi intenzivnim promenama u alifatičnim nizovima.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Interpretation of Serbian surface sediments' maturation parameters based on factor analysis
T1  - Primena faktorske analize u interpretaciji maturacionih parametara površinskih sedimenata Srbije
VL  - 69
IS  - 8-9
SP  - 611
EP  - 624
DO  - 10.2298/JSC0409611S
ER  - 

@article{
author = "Sainovic, A and Stojanović, Ksenija A. and Filopovic, I and Cvetković, Olga and Jovančićević, Branimir and Vitorović, Dragomir K.",
year = "2004",
abstract = "The factor analysis, used in this work for the interpretation of maturation parameters observed in an exploration study of a group of surface sediments of diverse age originating from different localities in Serbia, resulted in two significant factors. Factor 1 involved parameters related mainly to maturation changes within the aliphatic chains of the organic matter and factor 2 involved parameters based mainly on changes in the terpane and sterane rings. A statistically significant inversely proportional linear dependence between factors 1 and 2 was observed with older, in contrast to younger sediments, suggesting that the reactions of the aliphatic chains in the older sediments did not occur simultaneously with the reactions in the rings and, also, that the older surface sediments examined in this study may be characterized by a degree of thermal maturity corresponding to changes in the biomarker sterane and terpane rings, while the younger sediments by intensive changes in the aliphatic chains., U ovom radu faktorska analiza je primenjena za interpretaciju osam maturacionih parametara izračunatih u okviru eksploracionog istraživanja trinaest uzoraka površinskih sedimenata različite starosti, uzetih sa različitih lokaliteta u Srbiji. Analizom su utvrđena dva značajna faktora. Faktor 1 je obuhvatio parametre zasnovane pretežno na maturacionim promenama alifatičnih nizova, a faktor 2 parametre zasnovane uglavnom na promenama u terpanskim i steranskim prstenovima. Statistički značajna, obrnuto proporcionalna, linearna zavisnost između faktora 1 i 2 utvrđena je kod starijih, za razliku od mlađih sedimenata.Na osnovu toga pretpostavljeno je da se kod starih sedimenata reakcije u alifatičnom nizu i prstenu nisu odigravale istovremeno, i takođe, da se stariji sedimenti ispitivani u ovom radu mogu okarakterisati stepenom termičke zrelosti koji odgovara promenama u biomarkerskim steranskim i terpanskim prstenovima, a mlađi intenzivnim promenama u alifatičnim nizovima.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Interpretation of Serbian surface sediments' maturation parameters based on factor analysis, Primena faktorske analize u interpretaciji maturacionih parametara površinskih sedimenata Srbije",
volume = "69",
number = "8-9",
pages = "611-624",
doi = "10.2298/JSC0409611S"
}

Sainovic, A., Stojanović, K. A., Filopovic, I., Cvetković, O., Jovančićević, B.,& Vitorović, D. K.. (2004). Interpretation of Serbian surface sediments' maturation parameters based on factor analysis. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 69(8-9), 611-624.
https://doi.org/10.2298/JSC0409611S

Sainovic A, Stojanović KA, Filopovic I, Cvetković O, Jovančićević B, Vitorović DK. Interpretation of Serbian surface sediments' maturation parameters based on factor analysis. in Journal of the Serbian Chemical Society. 2004;69(8-9):611-624.
doi:10.2298/JSC0409611S .

Sainovic, A, Stojanović, Ksenija A., Filopovic, I, Cvetković, Olga, Jovančićević, Branimir, Vitorović, Dragomir K., "Interpretation of Serbian surface sediments' maturation parameters based on factor analysis" in Journal of the Serbian Chemical Society, 69, no. 8-9 (2004):611-624,
https://doi.org/10.2298/JSC0409611S . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Wehner, H.
AU  - Scheeder, G
AU  - Stojanović, Ksenija A.
AU  - Sainovic, A
AU  - Cvetković, Olga
AU  - Ercegovac, M
AU  - Vitorović, Dragomir K.
PY  - 2002
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/507
AB  - In a search for source rocks of the crude oils of the Drmno depression (Southern part of the Pannonian Basin, Serbia), based on bulk and specific organic geochemical parameters, six out of eight Sirakovo, Bubusinac and Bradarac sedimentary core samples were found to possess typical source rock characteristics. By comparing the results observed for these sedimentary samples with the corresponding propel-ties of the crude oils from the Sirakovo and Bradarac oil-gas fields, a positive organic geochemical oil-source rock correlation was experienced for the first time within this basin. This finding may be considered as an important step towards the ultimate organic geochemical/geological interpretation of the Drmno depression.
AB  - Ispitivani su sedimenti iz bušotina koje pripadaju lokacijama Sirakovo Bubušinac i Bradarac (depresija Drmno). Primenjene su organsko-geohemijske metode (određivanje sadržaja organskog ugljenika, bitumena i ugljovodonika, kao i određivanje raspodele i obilnosti bioloških markera tipa n-alkana izoprenoidnih alifatičnih alkana, triterpana i sterana) sa ciljem da se proceni njihova naftna potencijalnost. Za šest uzoraka utvrđen je visok stepen maturisanosti organske supstance, pripadnost "oil generation" fazi (Rr = 0,70 – 0,80 %), tercijarna starost i pretežno terestrijalno poreklo. Poređenjem sa sirovim naftama iz već otkrivenih naftnih ležišta bliskog lokaliteta (Sirakovo i Bradarac) utvrđena je značajna sličnost i prema maturisanosti i prema poreklu, na osnovu čega je između ispitivanih uzoraka sedimenata i nafti, prvi put kada je u pitanju depresija Drmno, definisana pozitivna korelacija nafta-izvorna stena.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Search for source rocks of the crude oils of the Drmno depression (southern part of the Pannonian Basin, Serbia)
T1  - Traganje za izvornim stenama nafti depresije Drmno, južni deo Panonskog basena, Srbija
VL  - 67
IS  - 8-9
SP  - 553
EP  - 566
DO  - 10.2298/JSC0209553J
ER  - 

@article{
author = "Jovančićević, Branimir and Wehner, H. and Scheeder, G and Stojanović, Ksenija A. and Sainovic, A and Cvetković, Olga and Ercegovac, M and Vitorović, Dragomir K.",
year = "2002",
abstract = "In a search for source rocks of the crude oils of the Drmno depression (Southern part of the Pannonian Basin, Serbia), based on bulk and specific organic geochemical parameters, six out of eight Sirakovo, Bubusinac and Bradarac sedimentary core samples were found to possess typical source rock characteristics. By comparing the results observed for these sedimentary samples with the corresponding propel-ties of the crude oils from the Sirakovo and Bradarac oil-gas fields, a positive organic geochemical oil-source rock correlation was experienced for the first time within this basin. This finding may be considered as an important step towards the ultimate organic geochemical/geological interpretation of the Drmno depression., Ispitivani su sedimenti iz bušotina koje pripadaju lokacijama Sirakovo Bubušinac i Bradarac (depresija Drmno). Primenjene su organsko-geohemijske metode (određivanje sadržaja organskog ugljenika, bitumena i ugljovodonika, kao i određivanje raspodele i obilnosti bioloških markera tipa n-alkana izoprenoidnih alifatičnih alkana, triterpana i sterana) sa ciljem da se proceni njihova naftna potencijalnost. Za šest uzoraka utvrđen je visok stepen maturisanosti organske supstance, pripadnost "oil generation" fazi (Rr = 0,70 – 0,80 %), tercijarna starost i pretežno terestrijalno poreklo. Poređenjem sa sirovim naftama iz već otkrivenih naftnih ležišta bliskog lokaliteta (Sirakovo i Bradarac) utvrđena je značajna sličnost i prema maturisanosti i prema poreklu, na osnovu čega je između ispitivanih uzoraka sedimenata i nafti, prvi put kada je u pitanju depresija Drmno, definisana pozitivna korelacija nafta-izvorna stena.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Search for source rocks of the crude oils of the Drmno depression (southern part of the Pannonian Basin, Serbia), Traganje za izvornim stenama nafti depresije Drmno, južni deo Panonskog basena, Srbija",
volume = "67",
number = "8-9",
pages = "553-566",
doi = "10.2298/JSC0209553J"
}

Jovančićević, B., Wehner, H., Scheeder, G., Stojanović, K. A., Sainovic, A., Cvetković, O., Ercegovac, M.,& Vitorović, D. K.. (2002). Search for source rocks of the crude oils of the Drmno depression (southern part of the Pannonian Basin, Serbia). in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 67(8-9), 553-566.
https://doi.org/10.2298/JSC0209553J

Jovančićević B, Wehner H, Scheeder G, Stojanović KA, Sainovic A, Cvetković O, Ercegovac M, Vitorović DK. Search for source rocks of the crude oils of the Drmno depression (southern part of the Pannonian Basin, Serbia). in Journal of the Serbian Chemical Society. 2002;67(8-9):553-566.
doi:10.2298/JSC0209553J .

Jovančićević, Branimir, Wehner, H., Scheeder, G, Stojanović, Ksenija A., Sainovic, A, Cvetković, Olga, Ercegovac, M, Vitorović, Dragomir K., "Search for source rocks of the crude oils of the Drmno depression (southern part of the Pannonian Basin, Serbia)" in Journal of the Serbian Chemical Society, 67, no. 8-9 (2002):553-566,
https://doi.org/10.2298/JSC0209553J . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Šainović, Aleksandar M.
AU  - Cvetković, Olga 
AU  - Filipović, Ivan T.
AU  - Ašanin, Petar M.
AU  - Vitorović, Dragomir K.
PY  - 2002
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/85
AB  - Samples of surface sediments originating from different localities in Serbia which contained more than 0.5 % organic matter were investigated in this paper. According to age, these samples were classified into two groups sediments of pretertiary age and sediments of tertiary age. Bulk and specific organic geochemical parameters were determined for their methylene chloride-methanol extracts, aimed at controling the relationship between the age of the sediment and the maturity of its organic substance. In this sense a general direct proportionality was observed. However, a better linear dependence of the bulk parameters was observed in the case of younger, tertiary sediments. That is to say, with samples of pretertiary age the organic matter maturity was approaching a definite limiting value contributing to an inferior linear dependence of their bulk maturation parameters. Nevertheless, the dependence was found to be preserved with specific maturation parameters (e.g., CPI; Fit/n-C18), the changes of which are generally more intensive at higher maturity degrees.
AB  - U ovom radu ispitivani su uzorci površinskih sedimenata sa različitih lokaliteta Srbije i sadržajem od preko 0,5% organske supstance, koji su se prema starosti mogli svrstati u dve grupe: sedimentne stene pretercijarne i sedimentne stene tercijarne starosti. U njihovim metilen-hlorid metanolskim ekstraktima određeni su grupni i specifični organsko-geohemijski maturacioni parametri da bi se proučilo da li postoji veza između starosti sedimenata i maturisanosti njihove organske supstance. U tom smislu, utvrđeno je da postoji opšta direktna propordonalnost. Međutim, nađeno je da grupni maturacioni parametri pokazuju bolju linearnu zavisnost kod mlađih, tercijarnih sedimenata. Naime, kod uzoraka pretercijarne starosti maturisanost organske supstance u većoj meri se približavala određenoj graničnoj vrednosti što je doprinosilo smanjenju očekivane linearne zavisnosti njihovih grupnih maturacionih parametara. Ipak, ta zavisnost je sačuvana kod specifičnih maturacionih parametara (na primer: CPI; Fit/n-C18) koji se izrazitije menjaju na višim stepenima maturisanosti.
T2  - Hemijska industrija
T1  - Investigation of pretertiary and tertiary surface sediments from Serbia: Organic geochemical interpretation
T1  - Ispitivanje pretercijarnih i tercijarnih površinskih sedimenata Srbije - organsko-geohemijska interpretacija
VL  - 56
IS  - 1
SP  - 25
EP  - 29
DO  - 10.2298/HEMIND0201025J
ER  - 

@article{
author = "Jovančićević, Branimir and Šainović, Aleksandar M. and Cvetković, Olga  and Filipović, Ivan T. and Ašanin, Petar M. and Vitorović, Dragomir K.",
year = "2002",
abstract = "Samples of surface sediments originating from different localities in Serbia which contained more than 0.5 % organic matter were investigated in this paper. According to age, these samples were classified into two groups sediments of pretertiary age and sediments of tertiary age. Bulk and specific organic geochemical parameters were determined for their methylene chloride-methanol extracts, aimed at controling the relationship between the age of the sediment and the maturity of its organic substance. In this sense a general direct proportionality was observed. However, a better linear dependence of the bulk parameters was observed in the case of younger, tertiary sediments. That is to say, with samples of pretertiary age the organic matter maturity was approaching a definite limiting value contributing to an inferior linear dependence of their bulk maturation parameters. Nevertheless, the dependence was found to be preserved with specific maturation parameters (e.g., CPI; Fit/n-C18), the changes of which are generally more intensive at higher maturity degrees., U ovom radu ispitivani su uzorci površinskih sedimenata sa različitih lokaliteta Srbije i sadržajem od preko 0,5% organske supstance, koji su se prema starosti mogli svrstati u dve grupe: sedimentne stene pretercijarne i sedimentne stene tercijarne starosti. U njihovim metilen-hlorid metanolskim ekstraktima određeni su grupni i specifični organsko-geohemijski maturacioni parametri da bi se proučilo da li postoji veza između starosti sedimenata i maturisanosti njihove organske supstance. U tom smislu, utvrđeno je da postoji opšta direktna propordonalnost. Međutim, nađeno je da grupni maturacioni parametri pokazuju bolju linearnu zavisnost kod mlađih, tercijarnih sedimenata. Naime, kod uzoraka pretercijarne starosti maturisanost organske supstance u većoj meri se približavala određenoj graničnoj vrednosti što je doprinosilo smanjenju očekivane linearne zavisnosti njihovih grupnih maturacionih parametara. Ipak, ta zavisnost je sačuvana kod specifičnih maturacionih parametara (na primer: CPI; Fit/n-C18) koji se izrazitije menjaju na višim stepenima maturisanosti.",
journal = "Hemijska industrija",
title = "Investigation of pretertiary and tertiary surface sediments from Serbia: Organic geochemical interpretation, Ispitivanje pretercijarnih i tercijarnih površinskih sedimenata Srbije - organsko-geohemijska interpretacija",
volume = "56",
number = "1",
pages = "25-29",
doi = "10.2298/HEMIND0201025J"
}

Jovančićević, B., Šainović, A. M., Cvetković, O., Filipović, I. T., Ašanin, P. M.,& Vitorović, D. K.. (2002). Investigation of pretertiary and tertiary surface sediments from Serbia: Organic geochemical interpretation. in Hemijska industrija, 56(1), 25-29.
https://doi.org/10.2298/HEMIND0201025J

Jovančićević B, Šainović AM, Cvetković O, Filipović IT, Ašanin PM, Vitorović DK. Investigation of pretertiary and tertiary surface sediments from Serbia: Organic geochemical interpretation. in Hemijska industrija. 2002;56(1):25-29.
doi:10.2298/HEMIND0201025J .

Jovančićević, Branimir, Šainović, Aleksandar M., Cvetković, Olga , Filipović, Ivan T., Ašanin, Petar M., Vitorović, Dragomir K., "Investigation of pretertiary and tertiary surface sediments from Serbia: Organic geochemical interpretation" in Hemijska industrija, 56, no. 1 (2002):25-29,
https://doi.org/10.2298/HEMIND0201025J . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Wehner, H.
AU  - Scheeder, G
AU  - Plecas, D
AU  - Ercegovac, M
AU  - Vitorović, Dragomir K.
PY  - 2001
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/456
AB  - The results of an investigation of crude oils originating from the Sirakovo and Bradarac-Maljurevac localities (southern part of the Pannonian Basin) are reported in this paper. The aim was to estimate the organic geochemical similarity of the crude oils fi om the DI mno (Kostolac) depression oil fields. The nine selected samples originated from reservoir. rocks of various depths. Reliable source and organic geochemical maturation parameters served as the basis for the correlation studies. The similar origin of the investigated DI mno depression crude oils was corroborated, characterized by a significant participation of terrestrial precursor biomass. They were shown to be of relatively low maturity and to have been formed during the earlier stages of the diagenet- ic-catagenetic sequence of processes leading to the formation of crude oils, most probably in source rocks of Tertiary age, corresponding to vitrinite reflectances between Ro = 0.70 % and Ro = 0.80%. The crude oils from Bradarac-Maljurevac seemed to be somewhat less homogeneous with respect to organic geochemical parameters compared to Sirakovo crude oils.
AB  - U ovom radu ispitivani su uzorci sirovih nafti depresije Drmno (Kostolac) sa lokaliteta Sirakovo i Bradarac-Maljurevac. Cilj rada bio je da se proceni organsko-geohemijska ujednačenost nafti naftnih polja depresije Drmno. Izabrani su uzorci koji potiču iz rezervoarskih stena sa različitih dubina i u njima su određeni grupni i specifični izvorni i maturacioni organsko-geohemijski parametri. Potvrđeno je da ispitivani uzorci depresije Drmno imaju slično poreklo koje karakteriše veći udeo terestrijalne prekursorske biomase. Ispitivane nafte su nešto nižeg stepena maturisanosti i nastale su u ranijim fazama dijagenetsko-katagenetske sekvencije formiranja nafte kojima odgovaraju vrednosti refleksije vitrinita između Ro = 0,70 % i Ro = 0,80 %. Najverovatnije su nastale u izvornim stenama tercijarne starosti. Nafte sa lokaliteta Bradarac-Maljurevac karakteriše nešto niži nivo organsko-geohemijske homogenosti nego nafte sa lokaliteta Sirakovo.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - An organic geochemical correlation study of some Drmno depresssion crude oils (southern part of the Pannonian Basin, Yugoslavia)
T1  - Organsko-geohemijska korelacija nekih nafti depresije Drmno (južni deo panonskog basena, Jugoslavija)
VL  - 66
IS  - 5
SP  - 297
EP  - 308
UR  - https://hdl.handle.net/21.15107/rcub_cherry_456
ER  - 

@article{
author = "Jovančićević, Branimir and Wehner, H. and Scheeder, G and Plecas, D and Ercegovac, M and Vitorović, Dragomir K.",
year = "2001",
abstract = "The results of an investigation of crude oils originating from the Sirakovo and Bradarac-Maljurevac localities (southern part of the Pannonian Basin) are reported in this paper. The aim was to estimate the organic geochemical similarity of the crude oils fi om the DI mno (Kostolac) depression oil fields. The nine selected samples originated from reservoir. rocks of various depths. Reliable source and organic geochemical maturation parameters served as the basis for the correlation studies. The similar origin of the investigated DI mno depression crude oils was corroborated, characterized by a significant participation of terrestrial precursor biomass. They were shown to be of relatively low maturity and to have been formed during the earlier stages of the diagenet- ic-catagenetic sequence of processes leading to the formation of crude oils, most probably in source rocks of Tertiary age, corresponding to vitrinite reflectances between Ro = 0.70 % and Ro = 0.80%. The crude oils from Bradarac-Maljurevac seemed to be somewhat less homogeneous with respect to organic geochemical parameters compared to Sirakovo crude oils., U ovom radu ispitivani su uzorci sirovih nafti depresije Drmno (Kostolac) sa lokaliteta Sirakovo i Bradarac-Maljurevac. Cilj rada bio je da se proceni organsko-geohemijska ujednačenost nafti naftnih polja depresije Drmno. Izabrani su uzorci koji potiču iz rezervoarskih stena sa različitih dubina i u njima su određeni grupni i specifični izvorni i maturacioni organsko-geohemijski parametri. Potvrđeno je da ispitivani uzorci depresije Drmno imaju slično poreklo koje karakteriše veći udeo terestrijalne prekursorske biomase. Ispitivane nafte su nešto nižeg stepena maturisanosti i nastale su u ranijim fazama dijagenetsko-katagenetske sekvencije formiranja nafte kojima odgovaraju vrednosti refleksije vitrinita između Ro = 0,70 % i Ro = 0,80 %. Najverovatnije su nastale u izvornim stenama tercijarne starosti. Nafte sa lokaliteta Bradarac-Maljurevac karakteriše nešto niži nivo organsko-geohemijske homogenosti nego nafte sa lokaliteta Sirakovo.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "An organic geochemical correlation study of some Drmno depresssion crude oils (southern part of the Pannonian Basin, Yugoslavia), Organsko-geohemijska korelacija nekih nafti depresije Drmno (južni deo panonskog basena, Jugoslavija)",
volume = "66",
number = "5",
pages = "297-308",
url = "https://hdl.handle.net/21.15107/rcub_cherry_456"
}

Jovančićević, B., Wehner, H., Scheeder, G., Plecas, D., Ercegovac, M.,& Vitorović, D. K.. (2001). An organic geochemical correlation study of some Drmno depresssion crude oils (southern part of the Pannonian Basin, Yugoslavia). in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 66(5), 297-308.
https://hdl.handle.net/21.15107/rcub_cherry_456

Jovančićević B, Wehner H, Scheeder G, Plecas D, Ercegovac M, Vitorović DK. An organic geochemical correlation study of some Drmno depresssion crude oils (southern part of the Pannonian Basin, Yugoslavia). in Journal of the Serbian Chemical Society. 2001;66(5):297-308.
https://hdl.handle.net/21.15107/rcub_cherry_456 .

Jovančićević, Branimir, Wehner, H., Scheeder, G, Plecas, D, Ercegovac, M, Vitorović, Dragomir K., "An organic geochemical correlation study of some Drmno depresssion crude oils (southern part of the Pannonian Basin, Yugoslavia)" in Journal of the Serbian Chemical Society, 66, no. 5 (2001):297-308,
https://hdl.handle.net/21.15107/rcub_cherry_456 .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Polić, Predrag S.
AU  - Vitorović, Dragomir K.
AU  - Scheeder, G
AU  - Teschner, M
AU  - Wehner, H.
PY  - 2001
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/457
AB  - The fate of oil-type pollutants in ground waters from the Danube River (Yugoslavia) alluvion tin the area of an oil refinery) was being surveyed during a long period of time. Based on detailed analyses of extracts (group composition, GC analysis of n-alkanes and isoprenoid aliphatic alkanes, and GC-MS analysis of polycyclic alkanes) isolated from the ground water samples taken five times from the same borehole during a period of approximately two years (beginning with the winter '97/'98 up to the winter '00), gradual but intensive microbiological degradation of oil-type pollutants has been asserted. However, following an almost complete degradation of,,crude oil" n-alkanes, formation of ,,new" n-alkanes was observed in the examined ground waters. The distribution of newly formed n-alkanes suggested that they most probably represent a product of metabolic processes of micro-organisms which might have participated hi the degradation of hydrocarbons originating from oil-type pollutants.
PB  - Inst Lebensmitteltechnologie Analytische Chemie, Freising-Weihenstephan
T2  - Fresenius Environmental Bulletin
T1  - Biodegradation of oil-type pollutants in Danube alluvial sediments (Yugoslavia)
VL  - 10
IS  - 2
SP  - 178
EP  - 182
UR  - https://hdl.handle.net/21.15107/rcub_cherry_457
ER  - 

@article{
author = "Jovančićević, Branimir and Polić, Predrag S. and Vitorović, Dragomir K. and Scheeder, G and Teschner, M and Wehner, H.",
year = "2001",
abstract = "The fate of oil-type pollutants in ground waters from the Danube River (Yugoslavia) alluvion tin the area of an oil refinery) was being surveyed during a long period of time. Based on detailed analyses of extracts (group composition, GC analysis of n-alkanes and isoprenoid aliphatic alkanes, and GC-MS analysis of polycyclic alkanes) isolated from the ground water samples taken five times from the same borehole during a period of approximately two years (beginning with the winter '97/'98 up to the winter '00), gradual but intensive microbiological degradation of oil-type pollutants has been asserted. However, following an almost complete degradation of,,crude oil" n-alkanes, formation of ,,new" n-alkanes was observed in the examined ground waters. The distribution of newly formed n-alkanes suggested that they most probably represent a product of metabolic processes of micro-organisms which might have participated hi the degradation of hydrocarbons originating from oil-type pollutants.",
publisher = "Inst Lebensmitteltechnologie Analytische Chemie, Freising-Weihenstephan",
journal = "Fresenius Environmental Bulletin",
title = "Biodegradation of oil-type pollutants in Danube alluvial sediments (Yugoslavia)",
volume = "10",
number = "2",
pages = "178-182",
url = "https://hdl.handle.net/21.15107/rcub_cherry_457"
}

Jovančićević, B., Polić, P. S., Vitorović, D. K., Scheeder, G., Teschner, M.,& Wehner, H.. (2001). Biodegradation of oil-type pollutants in Danube alluvial sediments (Yugoslavia). in Fresenius Environmental Bulletin
Inst Lebensmitteltechnologie Analytische Chemie, Freising-Weihenstephan., 10(2), 178-182.
https://hdl.handle.net/21.15107/rcub_cherry_457

Jovančićević B, Polić PS, Vitorović DK, Scheeder G, Teschner M, Wehner H. Biodegradation of oil-type pollutants in Danube alluvial sediments (Yugoslavia). in Fresenius Environmental Bulletin. 2001;10(2):178-182.
https://hdl.handle.net/21.15107/rcub_cherry_457 .

Jovančićević, Branimir, Polić, Predrag S., Vitorović, Dragomir K., Scheeder, G, Teschner, M, Wehner, H., "Biodegradation of oil-type pollutants in Danube alluvial sediments (Yugoslavia)" in Fresenius Environmental Bulletin, 10, no. 2 (2001):178-182,
https://hdl.handle.net/21.15107/rcub_cherry_457 .

TY  - JOUR
AU  - Ašanin, Petar M.
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
PY  - 2000
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/241
AB  - The paper presents the results of the organic geochemical investigation of crude oil and oil-gas fields of the southeastern part of the Pannonian Basin in Serbia (22 fields and 88 crude oil samples). The observed bulk and specific correlation parameters are discussed. Based on the analyses of biological markers (n-alkanes and polycyclic alkanes of the sterane and terpane type), the investigated oils were classified according to origin. Three genetic types of Serbian crude oils were also geologically interpreted. An attempt was made to contribute to a more efficient planning of further investigations (on the basis of geochemical-geological analyses of crude oils) within the entire Basin.
AB  - U radu su nafte jugoistočnog dela Panonskog basena na teritoriji Srbije (22 naftna i naftno-gasna polja i 88 uzoraka sirovih nafti) klasifikovane u genetske tipove na osnovu grupnih i specifičnih organsko-geohemijskih korelacionih, parametara. Za procenu porekla nafti od najveće koristi bili su rezultati analize bioloških markera tipa n-alkana i policikličnih alkana tipa sterana i triterpana. Postojanje tri genetska tipa nafte na teritoriji Srbije tumačeno je i sa geološkog aspekta. Učinjen je pokušaj da se na osnovu geohemijsko-geološkog tumačenja sirovih nafti iz već pronađenih aktivnih, bušotina doprinese efikasnijem planiranju daljeg istraživanja celog basena.
T2  - Energija, ekonomija, ekologija
T1  - Korelacija sirovih nafti jugoistočnog dela Panonskog basena na teritoriji Srbije - organsko-geohemijsko i geološko tumačenje
VL  - 5
IS  - 1-2
SP  - 97
EP  - 100
UR  - https://hdl.handle.net/21.15107/rcub_cherry_241
ER  - 

@article{
author = "Ašanin, Petar M. and Jovančićević, Branimir and Vitorović, Dragomir K.",
year = "2000",
abstract = "The paper presents the results of the organic geochemical investigation of crude oil and oil-gas fields of the southeastern part of the Pannonian Basin in Serbia (22 fields and 88 crude oil samples). The observed bulk and specific correlation parameters are discussed. Based on the analyses of biological markers (n-alkanes and polycyclic alkanes of the sterane and terpane type), the investigated oils were classified according to origin. Three genetic types of Serbian crude oils were also geologically interpreted. An attempt was made to contribute to a more efficient planning of further investigations (on the basis of geochemical-geological analyses of crude oils) within the entire Basin., U radu su nafte jugoistočnog dela Panonskog basena na teritoriji Srbije (22 naftna i naftno-gasna polja i 88 uzoraka sirovih nafti) klasifikovane u genetske tipove na osnovu grupnih i specifičnih organsko-geohemijskih korelacionih, parametara. Za procenu porekla nafti od najveće koristi bili su rezultati analize bioloških markera tipa n-alkana i policikličnih alkana tipa sterana i triterpana. Postojanje tri genetska tipa nafte na teritoriji Srbije tumačeno je i sa geološkog aspekta. Učinjen je pokušaj da se na osnovu geohemijsko-geološkog tumačenja sirovih nafti iz već pronađenih aktivnih, bušotina doprinese efikasnijem planiranju daljeg istraživanja celog basena.",
journal = "Energija, ekonomija, ekologija",
title = "Korelacija sirovih nafti jugoistočnog dela Panonskog basena na teritoriji Srbije - organsko-geohemijsko i geološko tumačenje",
volume = "5",
number = "1-2",
pages = "97-100",
url = "https://hdl.handle.net/21.15107/rcub_cherry_241"
}

Ašanin, P. M., Jovančićević, B.,& Vitorović, D. K.. (2000). Korelacija sirovih nafti jugoistočnog dela Panonskog basena na teritoriji Srbije - organsko-geohemijsko i geološko tumačenje. in Energija, ekonomija, ekologija, 5(1-2), 97-100.
https://hdl.handle.net/21.15107/rcub_cherry_241

Ašanin PM, Jovančićević B, Vitorović DK. Korelacija sirovih nafti jugoistočnog dela Panonskog basena na teritoriji Srbije - organsko-geohemijsko i geološko tumačenje. in Energija, ekonomija, ekologija. 2000;5(1-2):97-100.
https://hdl.handle.net/21.15107/rcub_cherry_241 .

Ašanin, Petar M., Jovančićević, Branimir, Vitorović, Dragomir K., "Korelacija sirovih nafti jugoistočnog dela Panonskog basena na teritoriji Srbije - organsko-geohemijsko i geološko tumačenje" in Energija, ekonomija, ekologija, 5, no. 1-2 (2000):97-100,
https://hdl.handle.net/21.15107/rcub_cherry_241 .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Polić, Predrag S.
AU  - Vitorović, Dragomir K.
PY  - 1998
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/377
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Organic geochemical investigation of crude oils. The southeastern part of the Pannonian Basin in Yugoslavia
VL  - 63
IS  - 6
SP  - 397
EP  - 418
UR  - https://hdl.handle.net/21.15107/rcub_cherry_377
ER  - 

@article{
author = "Jovančićević, Branimir and Polić, Predrag S. and Vitorović, Dragomir K.",
year = "1998",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Organic geochemical investigation of crude oils. The southeastern part of the Pannonian Basin in Yugoslavia",
volume = "63",
number = "6",
pages = "397-418",
url = "https://hdl.handle.net/21.15107/rcub_cherry_377"
}

Jovančićević, B., Polić, P. S.,& Vitorović, D. K.. (1998). Organic geochemical investigation of crude oils. The southeastern part of the Pannonian Basin in Yugoslavia. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 63(6), 397-418.
https://hdl.handle.net/21.15107/rcub_cherry_377

Jovančićević B, Polić PS, Vitorović DK. Organic geochemical investigation of crude oils. The southeastern part of the Pannonian Basin in Yugoslavia. in Journal of the Serbian Chemical Society. 1998;63(6):397-418.
https://hdl.handle.net/21.15107/rcub_cherry_377 .

Jovančićević, Branimir, Polić, Predrag S., Vitorović, Dragomir K., "Organic geochemical investigation of crude oils. The southeastern part of the Pannonian Basin in Yugoslavia" in Journal of the Serbian Chemical Society, 63, no. 6 (1998):397-418,
https://hdl.handle.net/21.15107/rcub_cherry_377 .

TY  - JOUR
AU  - Zujovic, Z
AU  - Srejic, R
AU  - Vucelic, D
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
PY  - 1998
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/380
AB  - Parallel proton and cross-polarization/magic-angle spinning (CP/MAS) nuclear magnetic resonance (NMR) relaxation measurements are reported on Aleksinac oil shale kerogen concentrate and pyrite-free kerogen concentrate. Possible relaxation mechanisms considered include proton-proton and C-13-proton interactions. The influence of depyritization on relaxation parameters is estimated. Depyritization prolongs the T-1H relaxation time constant by about five times. However, depyritization has no significant influence on relaxation in the rotating frame ( lt 5%). The probable explanation is that there is a certain motion of structural units with spectral density in the kHz region, which averages dipolar interactions between protons and pyrite. The repetition delay is found to be 150 ms for kerogen concentrate and 1-2 s for depyritized kerogen concentrate. The favourable value of contact time is identical for both samples, i.e., 1 ms. At the same time there are no significant changes observed in the CP/ MAS spectra of Aleksinac oil shale kerogen due to depyritization treatment, except for a small band (approximate to 60 ppm) assigned to alcoholic groups which appeared as a result of the partial reduction of carbonyl groups. Use of the pyrite-containing Bg sample in solid-state NMR investigations is found to be more favourable because of its shorter T-1H relaxation time and, consequently, shorter (by a factor of about five) experimental time. (C) 1998 Elsevier Science Ltd. All rights reserved.
PB  - Elsevier Sci Ltd, Oxford
T2  - Fuel
T1  - Influence of depyritization on NMR relaxation parameters of Aleksinac oil shale kerogen
VL  - 77
IS  - 9-10
SP  - 1001
EP  - 1003
UR  - https://hdl.handle.net/21.15107/rcub_cherry_380
ER  - 

@article{
author = "Zujovic, Z and Srejic, R and Vucelic, D and Jovančićević, Branimir and Vitorović, Dragomir K.",
year = "1998",
abstract = "Parallel proton and cross-polarization/magic-angle spinning (CP/MAS) nuclear magnetic resonance (NMR) relaxation measurements are reported on Aleksinac oil shale kerogen concentrate and pyrite-free kerogen concentrate. Possible relaxation mechanisms considered include proton-proton and C-13-proton interactions. The influence of depyritization on relaxation parameters is estimated. Depyritization prolongs the T-1H relaxation time constant by about five times. However, depyritization has no significant influence on relaxation in the rotating frame ( lt 5%). The probable explanation is that there is a certain motion of structural units with spectral density in the kHz region, which averages dipolar interactions between protons and pyrite. The repetition delay is found to be 150 ms for kerogen concentrate and 1-2 s for depyritized kerogen concentrate. The favourable value of contact time is identical for both samples, i.e., 1 ms. At the same time there are no significant changes observed in the CP/ MAS spectra of Aleksinac oil shale kerogen due to depyritization treatment, except for a small band (approximate to 60 ppm) assigned to alcoholic groups which appeared as a result of the partial reduction of carbonyl groups. Use of the pyrite-containing Bg sample in solid-state NMR investigations is found to be more favourable because of its shorter T-1H relaxation time and, consequently, shorter (by a factor of about five) experimental time. (C) 1998 Elsevier Science Ltd. All rights reserved.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Fuel",
title = "Influence of depyritization on NMR relaxation parameters of Aleksinac oil shale kerogen",
volume = "77",
number = "9-10",
pages = "1001-1003",
url = "https://hdl.handle.net/21.15107/rcub_cherry_380"
}

Zujovic, Z., Srejic, R., Vucelic, D., Jovančićević, B.,& Vitorović, D. K.. (1998). Influence of depyritization on NMR relaxation parameters of Aleksinac oil shale kerogen. in Fuel
Elsevier Sci Ltd, Oxford., 77(9-10), 1001-1003.
https://hdl.handle.net/21.15107/rcub_cherry_380

Zujovic Z, Srejic R, Vucelic D, Jovančićević B, Vitorović DK. Influence of depyritization on NMR relaxation parameters of Aleksinac oil shale kerogen. in Fuel. 1998;77(9-10):1001-1003.
https://hdl.handle.net/21.15107/rcub_cherry_380 .

Zujovic, Z, Srejic, R, Vucelic, D, Jovančićević, Branimir, Vitorović, Dragomir K., "Influence of depyritization on NMR relaxation parameters of Aleksinac oil shale kerogen" in Fuel, 77, no. 9-10 (1998):1001-1003,
https://hdl.handle.net/21.15107/rcub_cherry_380 .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Tasić, L.Z.
AU  - Polić, Predrag S.
AU  - Nedeljković, J.M.
AU  - Golovko, A.K.
AU  - Vitorović, Dragomir K.
PY  - 1996
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/62
AB  - GC-MS was applied in order to determine the effects of biodegradation on steranes and terpanes in crude oils. Sterane and tcrpane maturation parameters were correlated in 36 crude oils, biodegraded to various degrees (28 samples originate from the SE part of the Pannonian Basin, Yugoslavia, and X samples were obtained from the oil fields of Eastern Russia). The absence of any correlation between terpane maturation parameters indicated that terpane isomers are highly altered during biodegradation. On the other hand, satisfactory correlation between sterane parameters indicated that their abundance and distribution is less affected by microbial activity, and it can be concluded that sterane parameters represent more reliable maturation parameters.
T2  - Journal of the Serbian Chemical Society
T1  - GC-MS in crude oil correlation studies - Effects of biodegradation on sterane and terpane maturation parameters
VL  - 61
IS  - 9
SP  - 817
EP  - 821
UR  - https://hdl.handle.net/21.15107/rcub_cherry_62
ER  - 

@article{
author = "Jovančićević, Branimir and Tasić, L.Z. and Polić, Predrag S. and Nedeljković, J.M. and Golovko, A.K. and Vitorović, Dragomir K.",
year = "1996",
abstract = "GC-MS was applied in order to determine the effects of biodegradation on steranes and terpanes in crude oils. Sterane and tcrpane maturation parameters were correlated in 36 crude oils, biodegraded to various degrees (28 samples originate from the SE part of the Pannonian Basin, Yugoslavia, and X samples were obtained from the oil fields of Eastern Russia). The absence of any correlation between terpane maturation parameters indicated that terpane isomers are highly altered during biodegradation. On the other hand, satisfactory correlation between sterane parameters indicated that their abundance and distribution is less affected by microbial activity, and it can be concluded that sterane parameters represent more reliable maturation parameters.",
journal = "Journal of the Serbian Chemical Society",
title = "GC-MS in crude oil correlation studies - Effects of biodegradation on sterane and terpane maturation parameters",
volume = "61",
number = "9",
pages = "817-821",
url = "https://hdl.handle.net/21.15107/rcub_cherry_62"
}

Jovančićević, B., Tasić, L.Z., Polić, P. S., Nedeljković, J.M., Golovko, A.K.,& Vitorović, D. K.. (1996). GC-MS in crude oil correlation studies - Effects of biodegradation on sterane and terpane maturation parameters. in Journal of the Serbian Chemical Society, 61(9), 817-821.
https://hdl.handle.net/21.15107/rcub_cherry_62

Jovančićević B, Tasić L, Polić PS, Nedeljković J, Golovko A, Vitorović DK. GC-MS in crude oil correlation studies - Effects of biodegradation on sterane and terpane maturation parameters. in Journal of the Serbian Chemical Society. 1996;61(9):817-821.
https://hdl.handle.net/21.15107/rcub_cherry_62 .

Jovančićević, Branimir, Tasić, L.Z., Polić, Predrag S., Nedeljković, J.M., Golovko, A.K., Vitorović, Dragomir K., "GC-MS in crude oil correlation studies - Effects of biodegradation on sterane and terpane maturation parameters" in Journal of the Serbian Chemical Society, 61, no. 9 (1996):817-821,
https://hdl.handle.net/21.15107/rcub_cherry_62 .

TY  - JOUR
AU  - Ẑujović, Z.
AU  - Srejić, R.
AU  - Vučelić, D.
AU  - Vitorović, Dragomir K.
AU  - Jovančićević, Branimir
PY  - 1995
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/64
AB  - A sample of kerogen from Aleksinac oil shale was examined by high-resolution solid-state 13C n.m.r. spectroscopy. The presence and relative proportions of kerogen structural units were estimated using a combination of NQS and T1ρ{variant}C methods with a peak-synthesis technique applied to the 13C CP-MAS spectrum. Relaxation parameters from these experiments were used to estimate differences in relative 'mobility' of various structural units. The kerogen was found to be highly aliphatic and to contain ∼ 79% long-chain aliphatic plus alicyclic structures, as well as ∼ 9% aromatic structures. These findings are in good agreement with the characterization of the same kerogen from its oxidation products. © 1995.
T2  - Fuel
T1  - Structural analysis of Aleksinac oil shale kerogen by high-resolution solid-state 13C n.m.r. spectroscopy
VL  - 74
IS  - 12
SP  - 1903
EP  - 1909
DO  - 10.1016/0016-2361(95)80026-E
ER  - 

@article{
author = "Ẑujović, Z. and Srejić, R. and Vučelić, D. and Vitorović, Dragomir K. and Jovančićević, Branimir",
year = "1995",
abstract = "A sample of kerogen from Aleksinac oil shale was examined by high-resolution solid-state 13C n.m.r. spectroscopy. The presence and relative proportions of kerogen structural units were estimated using a combination of NQS and T1ρ{variant}C methods with a peak-synthesis technique applied to the 13C CP-MAS spectrum. Relaxation parameters from these experiments were used to estimate differences in relative 'mobility' of various structural units. The kerogen was found to be highly aliphatic and to contain ∼ 79% long-chain aliphatic plus alicyclic structures, as well as ∼ 9% aromatic structures. These findings are in good agreement with the characterization of the same kerogen from its oxidation products. © 1995.",
journal = "Fuel",
title = "Structural analysis of Aleksinac oil shale kerogen by high-resolution solid-state 13C n.m.r. spectroscopy",
volume = "74",
number = "12",
pages = "1903-1909",
doi = "10.1016/0016-2361(95)80026-E"
}

Ẑujović, Z., Srejić, R., Vučelić, D., Vitorović, D. K.,& Jovančićević, B.. (1995). Structural analysis of Aleksinac oil shale kerogen by high-resolution solid-state 13C n.m.r. spectroscopy. in Fuel, 74(12), 1903-1909.
https://doi.org/10.1016/0016-2361(95)80026-E

Ẑujović Z, Srejić R, Vučelić D, Vitorović DK, Jovančićević B. Structural analysis of Aleksinac oil shale kerogen by high-resolution solid-state 13C n.m.r. spectroscopy. in Fuel. 1995;74(12):1903-1909.
doi:10.1016/0016-2361(95)80026-E .

Ẑujović, Z., Srejić, R., Vučelić, D., Vitorović, Dragomir K., Jovančićević, Branimir, "Structural analysis of Aleksinac oil shale kerogen by high-resolution solid-state 13C n.m.r. spectroscopy" in Fuel, 74, no. 12 (1995):1903-1909,
https://doi.org/10.1016/0016-2361(95)80026-E . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Vučelić, D.
AU  - Šaban, M.
AU  - Wehner, H.
AU  - Vitorović, Dragomir K.
PY  - 1993
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/31
AB  - Evidence for catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale kerogen was found by investigating the liquid products obtained in the Micro Activity Test (MAT) pyrolysis of raw shale and its demineralized substrates. By comparing the corresponding fragmentograms of a demineralized sample with those of a substrate containing only silicate minerals, differences in the side-chain isomerisation of the steranes and triterpanes, and in the side-chain cleavage of the triaromatic steroids were observed. These findings corroborated the previous conclusion, based on MAT parameters and TG weight losses, that the catalytic effect of the indigenous mineral components during the pyrolysis of Aleksinac oil shale kerogen is very low. © 1993.
T2  - Organic Geochemistry
T1  - Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates
VL  - 20
IS  - 1
SP  - 69
EP  - 76
DO  - 10.1016/0146-6380(93)90082-M
ER  - 

@article{
author = "Jovančićević, Branimir and Vučelić, D. and Šaban, M. and Wehner, H. and Vitorović, Dragomir K.",
year = "1993",
abstract = "Evidence for catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale kerogen was found by investigating the liquid products obtained in the Micro Activity Test (MAT) pyrolysis of raw shale and its demineralized substrates. By comparing the corresponding fragmentograms of a demineralized sample with those of a substrate containing only silicate minerals, differences in the side-chain isomerisation of the steranes and triterpanes, and in the side-chain cleavage of the triaromatic steroids were observed. These findings corroborated the previous conclusion, based on MAT parameters and TG weight losses, that the catalytic effect of the indigenous mineral components during the pyrolysis of Aleksinac oil shale kerogen is very low. © 1993.",
journal = "Organic Geochemistry",
title = "Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates",
volume = "20",
number = "1",
pages = "69-76",
doi = "10.1016/0146-6380(93)90082-M"
}

Jovančićević, B., Vučelić, D., Šaban, M., Wehner, H.,& Vitorović, D. K.. (1993). Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates. in Organic Geochemistry, 20(1), 69-76.
https://doi.org/10.1016/0146-6380(93)90082-M

Jovančićević B, Vučelić D, Šaban M, Wehner H, Vitorović DK. Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates. in Organic Geochemistry. 1993;20(1):69-76.
doi:10.1016/0146-6380(93)90082-M .

Jovančićević, Branimir, Vučelić, D., Šaban, M., Wehner, H., Vitorović, Dragomir K., "Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates" in Organic Geochemistry, 20, no. 1 (1993):69-76,
https://doi.org/10.1016/0146-6380(93)90082-M . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
AU  - Šaban, M.
AU  - Wehner, H.
PY  - 1992
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/27
AB  - In order to evaluate the adsorption and catalytic effects of indigenous carbonates and silicates on the organic matter of Aleksinac oil shale, the free and the bound bitumens were isolated and analyzed by organic geochemical methods. The differences in the gross compositions indicated an adsorption effect of both the carbonates and silicates in the examined oil shale. The maturation parameters, based on n-alkanes and isoprenoid alkanes pristane and phytane, indicated that bitumen 3 was of the highest, and bitumen 1 of the lowest, apparent maturity. The silicates were shown to have had a thermocatalytic effect on the organic matter of this sediment. Clay minerals had a catalytic effect primarily on sterane aromatization, rearrangement of steranes into diasteranes and their (20R) → (20S) isomerization. All evidence obtained by analysis of steranes and aromatic steroids suggested that the differences in bitumen compositions should be explained by the effect of clay minerals rather than by variations in the origin of the precursor biomass. © 1992.
T2  - Organic Geochemistry
T1  - Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens
VL  - 18
IS  - 4
SP  - 511
EP  - 519
DO  - 10.1016/0146-6380(92)90114-D
ER  - 

@article{
author = "Jovančićević, Branimir and Vitorović, Dragomir K. and Šaban, M. and Wehner, H.",
year = "1992",
abstract = "In order to evaluate the adsorption and catalytic effects of indigenous carbonates and silicates on the organic matter of Aleksinac oil shale, the free and the bound bitumens were isolated and analyzed by organic geochemical methods. The differences in the gross compositions indicated an adsorption effect of both the carbonates and silicates in the examined oil shale. The maturation parameters, based on n-alkanes and isoprenoid alkanes pristane and phytane, indicated that bitumen 3 was of the highest, and bitumen 1 of the lowest, apparent maturity. The silicates were shown to have had a thermocatalytic effect on the organic matter of this sediment. Clay minerals had a catalytic effect primarily on sterane aromatization, rearrangement of steranes into diasteranes and their (20R) → (20S) isomerization. All evidence obtained by analysis of steranes and aromatic steroids suggested that the differences in bitumen compositions should be explained by the effect of clay minerals rather than by variations in the origin of the precursor biomass. © 1992.",
journal = "Organic Geochemistry",
title = "Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens",
volume = "18",
number = "4",
pages = "511-519",
doi = "10.1016/0146-6380(92)90114-D"
}

Jovančićević, B., Vitorović, D. K., Šaban, M.,& Wehner, H.. (1992). Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens. in Organic Geochemistry, 18(4), 511-519.
https://doi.org/10.1016/0146-6380(92)90114-D

Jovančićević B, Vitorović DK, Šaban M, Wehner H. Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens. in Organic Geochemistry. 1992;18(4):511-519.
doi:10.1016/0146-6380(92)90114-D .

Jovančićević, Branimir, Vitorović, Dragomir K., Šaban, M., Wehner, H., "Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens" in Organic Geochemistry, 18, no. 4 (1992):511-519,
https://doi.org/10.1016/0146-6380(92)90114-D . .

TY  - JOUR
AU  - Vučelić, D.
AU  - Marković, Violeta
AU  - Vučelić, V.
AU  - Spiridonović, D.
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
PY  - 1992
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/30
AB  - The catalytic effect of indigenous minerals in the pyrolysis of Aleksinac (Yugoslavia) oil shale was studied in this paper. The substrates were prepared by gradual removal of the mineral constituents (carbonates, silicates, pyrite) and the free and bound bitumens. The substrates were analyzed by chemical methods, X-ray diffraction, porosimetry, thermal analysis, 13C NMR, and standard ASTM Micro Activity Test (MAT) designed for the investigation of cracking catalysts. The liquid pyrolysis products were analyzed by organic geochemical techniques as well. Based on the yields of gaseous and liquid products and the coke, conversion degrees, GC analyses (MAT parameters) and weight losses (TG parameter), the catalytic effect of indigenous mineral components in the pyrolysis of Aleksinac oil shale organic matter was found to be very low. The results suggested that principal organic matter changes should be attributed to thermal rather than to catalytic cracking. © 1992.
T2  - Organic Geochemistry
T1  - Investigation of catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale organic matter
VL  - 19
IS  - 4-6
SP  - 445
EP  - 453
DO  - 10.1016/0146-6380(92)90011-L
ER  - 

@article{
author = "Vučelić, D. and Marković, Violeta and Vučelić, V. and Spiridonović, D. and Jovančićević, Branimir and Vitorović, Dragomir K.",
year = "1992",
abstract = "The catalytic effect of indigenous minerals in the pyrolysis of Aleksinac (Yugoslavia) oil shale was studied in this paper. The substrates were prepared by gradual removal of the mineral constituents (carbonates, silicates, pyrite) and the free and bound bitumens. The substrates were analyzed by chemical methods, X-ray diffraction, porosimetry, thermal analysis, 13C NMR, and standard ASTM Micro Activity Test (MAT) designed for the investigation of cracking catalysts. The liquid pyrolysis products were analyzed by organic geochemical techniques as well. Based on the yields of gaseous and liquid products and the coke, conversion degrees, GC analyses (MAT parameters) and weight losses (TG parameter), the catalytic effect of indigenous mineral components in the pyrolysis of Aleksinac oil shale organic matter was found to be very low. The results suggested that principal organic matter changes should be attributed to thermal rather than to catalytic cracking. © 1992.",
journal = "Organic Geochemistry",
title = "Investigation of catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale organic matter",
volume = "19",
number = "4-6",
pages = "445-453",
doi = "10.1016/0146-6380(92)90011-L"
}

Vučelić, D., Marković, V., Vučelić, V., Spiridonović, D., Jovančićević, B.,& Vitorović, D. K.. (1992). Investigation of catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale organic matter. in Organic Geochemistry, 19(4-6), 445-453.
https://doi.org/10.1016/0146-6380(92)90011-L

Vučelić D, Marković V, Vučelić V, Spiridonović D, Jovančićević B, Vitorović DK. Investigation of catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale organic matter. in Organic Geochemistry. 1992;19(4-6):445-453.
doi:10.1016/0146-6380(92)90011-L .

Vučelić, D., Marković, Violeta, Vučelić, V., Spiridonović, D., Jovančićević, Branimir, Vitorović, Dragomir K., "Investigation of catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale organic matter" in Organic Geochemistry, 19, no. 4-6 (1992):445-453,
https://doi.org/10.1016/0146-6380(92)90011-L . .

TY  - JOUR
AU  - Šaban, M.
AU  - Jovančićević, Branimir
AU  - Saračević, S.
AU  - Hollerbach, A.
AU  - Vitorović, Dragomir K.
PY  - 1988
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4
AB  - Several crude oils from the southeastern Yugoslav part of the Pannonian Basin are correlated for the first time on the basis of many bulk and specific parameters. The investigations involved 15 oils from oil-gas fields A and B and oil field C from the Banat depression and oil field D from South Bačka depression, and four oils from recently discovered oil shows E (the Kostolac depression). On the basis of structural group analysis and other bulk parameters such as API gravity, contents of asphaltenes and sulfur, as well as content of n-alkanes and pristane to phytane ratio, the examined oils are classified into four groups. However, the distributions and relative abundances of n-alkanes, isoprenoids (C19, C20), steranes, tricyclic terpanes and pentacyclic triterpanes, obtained by capillary GC and computerized GC-MS analysis, suggest classification of the examined oils into only two genetic types: A-D and E1-E4. The oils are of relatively high maturity. They are not biodegraded, except for both oils from field D and the oil A9. © 1987.
T2  - Organic Geochemistry
T1  - Correlative geochemical study of crude oils from southeastern and southern parts of the Pannonian Basin
VL  - 13
IS  - 1-3
SP  - 325
EP  - 333
DO  - 10.1016/0146-6380(88)90052-6
ER  - 

@article{
author = "Šaban, M. and Jovančićević, Branimir and Saračević, S. and Hollerbach, A. and Vitorović, Dragomir K.",
year = "1988",
abstract = "Several crude oils from the southeastern Yugoslav part of the Pannonian Basin are correlated for the first time on the basis of many bulk and specific parameters. The investigations involved 15 oils from oil-gas fields A and B and oil field C from the Banat depression and oil field D from South Bačka depression, and four oils from recently discovered oil shows E (the Kostolac depression). On the basis of structural group analysis and other bulk parameters such as API gravity, contents of asphaltenes and sulfur, as well as content of n-alkanes and pristane to phytane ratio, the examined oils are classified into four groups. However, the distributions and relative abundances of n-alkanes, isoprenoids (C19, C20), steranes, tricyclic terpanes and pentacyclic triterpanes, obtained by capillary GC and computerized GC-MS analysis, suggest classification of the examined oils into only two genetic types: A-D and E1-E4. The oils are of relatively high maturity. They are not biodegraded, except for both oils from field D and the oil A9. © 1987.",
journal = "Organic Geochemistry",
title = "Correlative geochemical study of crude oils from southeastern and southern parts of the Pannonian Basin",
volume = "13",
number = "1-3",
pages = "325-333",
doi = "10.1016/0146-6380(88)90052-6"
}

Šaban, M., Jovančićević, B., Saračević, S., Hollerbach, A.,& Vitorović, D. K.. (1988). Correlative geochemical study of crude oils from southeastern and southern parts of the Pannonian Basin. in Organic Geochemistry, 13(1-3), 325-333.
https://doi.org/10.1016/0146-6380(88)90052-6

Šaban M, Jovančićević B, Saračević S, Hollerbach A, Vitorović DK. Correlative geochemical study of crude oils from southeastern and southern parts of the Pannonian Basin. in Organic Geochemistry. 1988;13(1-3):325-333.
doi:10.1016/0146-6380(88)90052-6 .

Šaban, M., Jovančićević, Branimir, Saračević, S., Hollerbach, A., Vitorović, Dragomir K., "Correlative geochemical study of crude oils from southeastern and southern parts of the Pannonian Basin" in Organic Geochemistry, 13, no. 1-3 (1988):325-333,
https://doi.org/10.1016/0146-6380(88)90052-6 . .