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Journal Article

Pristine biomarker compositions recovered from biodegraded oil samples using MSSV-Hy

Authors
/persons/resource/shyang

Yang,  Shengyu
3.2 Organic Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Horsfield,  Brian
External Organizations;

/persons/resource/kama

Mangelsdorf,  Kai
3.2 Organic Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

di Primio,  Rolando
External Organizations;

Rinna,  Joachim
External Organizations;

Hartwig,  Alexander
External Organizations;

Martín-Monge,  Antonio
External Organizations;

Tocco,  Rafael Antonio
External Organizations;

Elias,  Rouven
External Organizations;

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Citation

Yang, S., Horsfield, B., Mangelsdorf, K., di Primio, R., Rinna, J., Hartwig, A., Martín-Monge, A., Tocco, R. A., Elias, R. (2024): Pristine biomarker compositions recovered from biodegraded oil samples using MSSV-Hy. - Marine and Petroleum Geology, 162, 106713.
https://doi.org/10.1016/j.marpetgeo.2024.106713


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5027021
Abstract
Oil-source and oil-oil correlations are challenging when the primary chemical composition of petroleum was altered or destroyed by biodegradation. Biomarkers that are bound to macromolecular matrices rather than being in a free form are largely protected from alteration and may therefore offer a solution to the challenges. Using Microscale Sealed Vessel Catalytic Hydrogenation (MSSV-Hy), the bound biomarkers of two North Sea and two Barents Sea oil samples, with varying levels of biodegradation, were released from their respective asphaltenes. Despite biodegradation having changed the relative concentrations of steranes (C27–C30 steranes) and hopanes (C29–C30 hopanes) in the free biomarker fraction to varying degrees, the asphaltene-bound biomarkers were protected and show pristine ratios unaffected by biodegradation, e.g., the relative content of C27–C29 steranes, the C30/C29 sterane ratio, and the C29/C30 hopane ratio. Empirical calibration then allows these bound biomarkers to be converted into regular biomarker ratios. The MSSV-Hy technique has been shown to be an efficient and effective tool for releasing asphaltene-bound biomarkers from biodegraded oil and revealing genetic information when free biomarkers are altered by biodegradation.