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Pedentchouk, Nikolai 
ORCID: https://orcid.org/0000-0002-2923-966X, Bennett, Barry and Larter, Steve
(2021)
δ13C and δD values of n-alkanes from in-reservoir biodegraded oils: Implications for understanding the mechanisms of biodegradation and for petroleum exploration.
Geosciences, 11 (9).
ISSN 2076-3263
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Abstract
This study investigates the magnitude and direction of stable C and H isotope shifts of n-C 15–30 alkanes from biodegraded oils sourced from Type II (Oil suite S) and Type II/III (Oil suite H) kerogens. Compound-specific isotope data show a 2.0‰ 13C-enrichment and no D-enrichment of n-alkanes in the most biodegraded oil from sample suite S. Similarly, there is a 1.5–2.5‰ 13C-enrichment and no D-enrichment in Oil suite H. Overall, there is a <2.5‰ δ 13C and <20‰ δD variability among individual n-alkanes in the whole sequence of biodegradation. N-alkanes from the least biodegraded Oil H samples are 2–4‰ 13C-enriched in comparison with the least biodegraded Oil S. However, there are no differences in the δD values of n-alkanes in these samples. Our indirect isotopic evidence suggests (1) a site-specific biodegradation process, most likely at position C-2 and/or C-3 or another site-specific process, and (2) a significant D/H exchange between organic compounds in the source rock and isotopically similar marine formation waters. We conclude that, unlike δD methodology, investigation of δ 13C composition of n-alkanes has strong potential as a supplementary tool for oil–oil and oil–source-rock correlation even in biodegraded oils when n-alkanes are present.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | carbon,correlation,hydrogen,isotopes,n-alkanes,oil biodegradation,earth and planetary sciences(all),sdg 14 - life below water ,/dk/atira/pure/subjectarea/asjc/1900 |
| Faculty \ School: | Faculty of Science > School of Environmental Sciences |
| UEA Research Groups: | Faculty of Science > Research Groups > Environmental Biology Faculty of Science > Research Groups > Geosciences |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 16 Sep 2021 11:17 |
| Last Modified: | 23 Oct 2022 03:01 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/81440 |
| DOI: | 10.3390/geosciences11090365 |
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