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Paleo-biodegradation and hydrocarbon mixing in a major hybrid petroleum reservoir

Some of the parental material for hydrocarbons produced from low-permeability reservoirs in Western Canada corresponds to thermal products from biodegraded oil. This has been proved by the occurrence of framboidal pyrite, which is often formed during microbial sulfate reduction (MSR). In addition, t...

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Autores principales: Cesar, Jaime, Ardakani, Omid H., Watt, Elizabeth, Song, Yishu, Kingston, Andrew, Ahad, Jason M. E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
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Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10020580/
https://www.ncbi.nlm.nih.gov/pubmed/36927775
http://dx.doi.org/10.1038/s41598-023-31350-z
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author Cesar, Jaime
Ardakani, Omid H.
Watt, Elizabeth
Song, Yishu
Kingston, Andrew
Ahad, Jason M. E.
author_facet Cesar, Jaime
Ardakani, Omid H.
Watt, Elizabeth
Song, Yishu
Kingston, Andrew
Ahad, Jason M. E.
author_sort Cesar, Jaime
collection PubMed
description Some of the parental material for hydrocarbons produced from low-permeability reservoirs in Western Canada corresponds to thermal products from biodegraded oil. This has been proved by the occurrence of framboidal pyrite, which is often formed during microbial sulfate reduction (MSR). In addition, the identified pyrite framboids are associated with the presence of phosphorus (P). Phosphorus (as phosphate) is a key nutrient and energy carrier for sulfate-reducing bacteria. The pyrite-P assemblage occurs embedded in solid bitumen (thermal residue), which confirms that migrated hydrocarbons provided the environment for microbial growth. Molecular products of severe biodegradation such as 17-nortricyclic terpanes were also detected. Biodegradation effects have been masked not only by thermal degradation of biodegraded oil during maximum burial, but also due to hydrocarbon mixing with late gas-condensate charges. Suitable conditions for biodegradation (< 80 °C, basin uplift) occurred during the Early Cretaceous. The confirmation of paleo-biodegradation means that there was a significant hydrocarbon loss that we have not accounted for. Likewise, MSR and Early Cretaceous seawater sulfate might have played an important role in the generation of the hydrogen sulfide (H(2)S) detected today.
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spelling pubmed-100205802023-03-18 Paleo-biodegradation and hydrocarbon mixing in a major hybrid petroleum reservoir Cesar, Jaime Ardakani, Omid H. Watt, Elizabeth Song, Yishu Kingston, Andrew Ahad, Jason M. E. Sci Rep Article Some of the parental material for hydrocarbons produced from low-permeability reservoirs in Western Canada corresponds to thermal products from biodegraded oil. This has been proved by the occurrence of framboidal pyrite, which is often formed during microbial sulfate reduction (MSR). In addition, the identified pyrite framboids are associated with the presence of phosphorus (P). Phosphorus (as phosphate) is a key nutrient and energy carrier for sulfate-reducing bacteria. The pyrite-P assemblage occurs embedded in solid bitumen (thermal residue), which confirms that migrated hydrocarbons provided the environment for microbial growth. Molecular products of severe biodegradation such as 17-nortricyclic terpanes were also detected. Biodegradation effects have been masked not only by thermal degradation of biodegraded oil during maximum burial, but also due to hydrocarbon mixing with late gas-condensate charges. Suitable conditions for biodegradation (< 80 °C, basin uplift) occurred during the Early Cretaceous. The confirmation of paleo-biodegradation means that there was a significant hydrocarbon loss that we have not accounted for. Likewise, MSR and Early Cretaceous seawater sulfate might have played an important role in the generation of the hydrogen sulfide (H(2)S) detected today. Nature Publishing Group UK 2023-03-16 /pmc/articles/PMC10020580/ /pubmed/36927775 http://dx.doi.org/10.1038/s41598-023-31350-z Text en © Crown 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Cesar, Jaime
Ardakani, Omid H.
Watt, Elizabeth
Song, Yishu
Kingston, Andrew
Ahad, Jason M. E.
Paleo-biodegradation and hydrocarbon mixing in a major hybrid petroleum reservoir
title Paleo-biodegradation and hydrocarbon mixing in a major hybrid petroleum reservoir
title_full Paleo-biodegradation and hydrocarbon mixing in a major hybrid petroleum reservoir
title_fullStr Paleo-biodegradation and hydrocarbon mixing in a major hybrid petroleum reservoir
title_full_unstemmed Paleo-biodegradation and hydrocarbon mixing in a major hybrid petroleum reservoir
title_short Paleo-biodegradation and hydrocarbon mixing in a major hybrid petroleum reservoir
title_sort paleo-biodegradation and hydrocarbon mixing in a major hybrid petroleum reservoir
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10020580/
https://www.ncbi.nlm.nih.gov/pubmed/36927775
http://dx.doi.org/10.1038/s41598-023-31350-z
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