Correlation between the Stretching Vibrations of Aliphatic Groups and the Structural and Geochemical Properties of Crude Oils of the Same Genetic Type Using the Case of the Turija-Sever Oil Field, Pannonian Basin, Serbia
Abstract
The paper describes an investigation of structural and geochemical properties of genetically similar crude oils from the Turija-sever field located in the South-Eastern Pannonian Basin, Serbia. Samples from 56 wells were examined by infrared spectroscopy (IR) and gas chromatography (GC). The IR spectral region of 2800– 3000 cm–1 was modeled by the sum of Lorentzian functions to reveal the contributions of aliphatic stretching vibrations, from which the alkane branching factor was evaluated. Being dependent on the aliphatic chain branching, the CH2 absorption peaks shifted by 3–4 cm–1 towards high frequencies when passing from the least-branched to the most-branched oil samples. This is associated with an increase in the fraction of gauche-conformations in polymethylene fragments. GC data shows the similarity of Turija-sever oils in thermal maturity, corresponding to to the early stage of liquid hydrocarbon generation and revealing a mixed aquatic-terrigenous origin of the precursor org...anic matter (OM) generated in a transitional reducing to weakly oxidizing depositional environment. In view of a significant correlation revealed between the alkane branching and the geochemistry, the samples were readily divided into two groups. Specifically, oils of Group I have a higher contribution of algae to the precursor OM and were generated under more reducing conditions than oils of Group II. The obtained data demonstrates in practice the advantage of the GC-IR combination to explain the structural and geochemical properties of sedimentary OM.
Keywords:
Turija-sever oil field / infrared spectroscopy / spectral modeling / aliphatic chain branching / n-alkanes / isoprenoidsSource:
Petroleum Chemistry, 2021, 61, 9, 1002-1010Publisher:
- Springer
Funding / projects:
- Ministry of Science, Technological Development and Innovation of the Republic of Serbia, institutional funding - 200168 (University of Belgrade, Faculty of Chemistry) (RS-MESTD-inst-2020-200168)
Note:
- Supplementary material: https://cherry.chem.bg.ac.rs/handle/123456789/4822
- Peer-reviewed manuscript: https://cherry.chem.bg.ac.rs/handle/123456789/4853
Related info:
- Referenced by
https://cherry.chem.bg.ac.rs/handle/123456789/4822
DOI: 10.1134/S0965544121090024
ISSN: 0965-5441
WoS: 000694560600002
Scopus: 2-s2.0-85114638834
Collections
Institution/Community
Hemijski fakultet / Faculty of ChemistryTY - JOUR AU - Stevanović, Jelena AU - Rakitin, A. R. AU - Stojanović, Ksenija A. PY - 2021 UR - http://cherry.chem.bg.ac.rs/handle/123456789/4821 AB - The paper describes an investigation of structural and geochemical properties of genetically similar crude oils from the Turija-sever field located in the South-Eastern Pannonian Basin, Serbia. Samples from 56 wells were examined by infrared spectroscopy (IR) and gas chromatography (GC). The IR spectral region of 2800– 3000 cm–1 was modeled by the sum of Lorentzian functions to reveal the contributions of aliphatic stretching vibrations, from which the alkane branching factor was evaluated. Being dependent on the aliphatic chain branching, the CH2 absorption peaks shifted by 3–4 cm–1 towards high frequencies when passing from the least-branched to the most-branched oil samples. This is associated with an increase in the fraction of gauche-conformations in polymethylene fragments. GC data shows the similarity of Turija-sever oils in thermal maturity, corresponding to to the early stage of liquid hydrocarbon generation and revealing a mixed aquatic-terrigenous origin of the precursor organic matter (OM) generated in a transitional reducing to weakly oxidizing depositional environment. In view of a significant correlation revealed between the alkane branching and the geochemistry, the samples were readily divided into two groups. Specifically, oils of Group I have a higher contribution of algae to the precursor OM and were generated under more reducing conditions than oils of Group II. The obtained data demonstrates in practice the advantage of the GC-IR combination to explain the structural and geochemical properties of sedimentary OM. PB - Springer T2 - Petroleum Chemistry T1 - Correlation between the Stretching Vibrations of Aliphatic Groups and the Structural and Geochemical Properties of Crude Oils of the Same Genetic Type Using the Case of the Turija-Sever Oil Field, Pannonian Basin, Serbia VL - 61 IS - 9 SP - 1002 EP - 1010 DO - 10.1134/S0965544121090024 ER -
@article{ author = "Stevanović, Jelena and Rakitin, A. R. and Stojanović, Ksenija A.", year = "2021", abstract = "The paper describes an investigation of structural and geochemical properties of genetically similar crude oils from the Turija-sever field located in the South-Eastern Pannonian Basin, Serbia. Samples from 56 wells were examined by infrared spectroscopy (IR) and gas chromatography (GC). The IR spectral region of 2800– 3000 cm–1 was modeled by the sum of Lorentzian functions to reveal the contributions of aliphatic stretching vibrations, from which the alkane branching factor was evaluated. Being dependent on the aliphatic chain branching, the CH2 absorption peaks shifted by 3–4 cm–1 towards high frequencies when passing from the least-branched to the most-branched oil samples. This is associated with an increase in the fraction of gauche-conformations in polymethylene fragments. GC data shows the similarity of Turija-sever oils in thermal maturity, corresponding to to the early stage of liquid hydrocarbon generation and revealing a mixed aquatic-terrigenous origin of the precursor organic matter (OM) generated in a transitional reducing to weakly oxidizing depositional environment. In view of a significant correlation revealed between the alkane branching and the geochemistry, the samples were readily divided into two groups. Specifically, oils of Group I have a higher contribution of algae to the precursor OM and were generated under more reducing conditions than oils of Group II. The obtained data demonstrates in practice the advantage of the GC-IR combination to explain the structural and geochemical properties of sedimentary OM.", publisher = "Springer", journal = "Petroleum Chemistry", title = "Correlation between the Stretching Vibrations of Aliphatic Groups and the Structural and Geochemical Properties of Crude Oils of the Same Genetic Type Using the Case of the Turija-Sever Oil Field, Pannonian Basin, Serbia", volume = "61", number = "9", pages = "1002-1010", doi = "10.1134/S0965544121090024" }
Stevanović, J., Rakitin, A. R.,& Stojanović, K. A.. (2021). Correlation between the Stretching Vibrations of Aliphatic Groups and the Structural and Geochemical Properties of Crude Oils of the Same Genetic Type Using the Case of the Turija-Sever Oil Field, Pannonian Basin, Serbia. in Petroleum Chemistry Springer., 61(9), 1002-1010. https://doi.org/10.1134/S0965544121090024
Stevanović J, Rakitin AR, Stojanović KA. Correlation between the Stretching Vibrations of Aliphatic Groups and the Structural and Geochemical Properties of Crude Oils of the Same Genetic Type Using the Case of the Turija-Sever Oil Field, Pannonian Basin, Serbia. in Petroleum Chemistry. 2021;61(9):1002-1010. doi:10.1134/S0965544121090024 .
Stevanović, Jelena, Rakitin, A. R., Stojanović, Ksenija A., "Correlation between the Stretching Vibrations of Aliphatic Groups and the Structural and Geochemical Properties of Crude Oils of the Same Genetic Type Using the Case of the Turija-Sever Oil Field, Pannonian Basin, Serbia" in Petroleum Chemistry, 61, no. 9 (2021):1002-1010, https://doi.org/10.1134/S0965544121090024 . .