数字农科院2.0

Anaerobic hydrocarbon biodegradation by alkylotrophic methanogens in deep oil reservoirs

文献类型： 外文期刊

作者： Zhang, Cui-Jing;Zhou, Zhuo;Cha, Guihong;Li, Ling;Fu, Lin;Liu, Lai-Yan;Yang, Lu;Wegener, Gunter;Cheng, Lei;Li, Meng

作者机构：

关键词： methanogenic hydrocarbon biodegradation;oil reservoirs;Candidatus Methanoliparum;alkylotrophic methanogens;metagenomic

期刊名称： ISME JOURNAL

ISSN： 1751-7362

年卷期： 2024 年 18 卷 1 期

页码：

收录情况： SCIE（2024版）

摘要： In subsurface biodegraded oil reservoirs, methanogenic biodegradation of crude oil is a common process. This process was previously assigned to the syntrophy of hydrocarbon-degrading bacteria and methanogenic archaea. Recent studies showed that archaea of the Candidatus Methanoliparum named as alkylotrophic methanogens couple hydrocarbon degradation and methane production in a single archaeon. To assess the geochemical role of Ca. Methanoliparum, we analyzed the chemical and microbial composition and metabolites of 209 samples from 15 subsurface oil reservoirs across China. Gas chromatography-mass spectrometry analysis revealed that 92% of the tested samples were substantially degraded. Molecular analysis showed that 85% of the tested samples contained Ca. Methanoliparum, and 52% of the tested samples harbored multiple alkyl-coenzyme M derivatives, the intercellular metabolites of alkylotrophic archaea. According to metagenomic and metatranscriptomic analyses, Ca. Methanoliparum dominates hydrocarbon degradation in biodegraded samples from the Changqing, Jiangsu, and Shengli (SL) oilfields, and it is persistently present as shown in a 15-year-long sampling effort at the Shengli oilfield. Together, these findings demonstrate that Ca. Methanoliparum is a widely distributed oil degrader in reservoirs of China, suggesting that alkylotrophic methanogenesis by archaea plays a key role in the alteration of oil reservoirs, thereby expanding our understanding of biogeochemical process in the deep biosphere.

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