首页|The contribution of bacteria to organic matter in coal-measure source rocks

The contribution of bacteria to organic matter in coal-measure source rocks

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  • 国家科技期刊平台
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On the basis of GC-MS analysis,a suite of nine coal-measure source rocks (Ro 0.51％-0.63％) from the southern margin of Junggar basin was found to contain many biomarkers for bacterially-generated hydrocarbons:hopane,sesquiterpene,C23+ monomethyl alkanes (even carbon predominance),and C24+ alkyl cyclohexane.Rock-eval and microscope analysis indicate that vitrinite (especially desmocollinite and homocollinite) plays a significant role in the generation of hydrocarbons in coalmeasure source rocks.Vitrinite performs this role by absorbing ultramicroscopic organic matter,generally in the form of resins or bacterial plastids.C23+ monomethyl alkanes (even carbon predominance) and C24+ alkyl cyclohexane series compounds are derived from bacterial metabolites of higher plants.The ultramicro organic matter adsorbed by vitrinite source rocks in the study area is probably ultramicro bacterial plastids.Because the organic matter of higher plants with low hydrogen content has been transformed into organic matter rich in hydrogen by bacteria,the hydrocarbon generation capacity of source rocks is greatly improved.In other words,in coal-measure source rocks,bacteria play an important role in hydrocarbon generation.

Coal-measure source rocksOrganic matter typeBacteriaMonomethyl alkanesAlkyl cyclohexane

Qingsong Cheng、Min Zhang、Guanghui Huang、Wenjun Zhang

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College of Resources and Environment, Yangtze University,Wuhan 430100, China

Key Laboratory of Exploration Technology for Oil & Gas Research(Yangtze University), Ministry of Education,Wuhan 430100, China

Bohai Petroleum Research Institute, CNOOC(China)Co.,Ltd., Tianjin Branch, Tianjin 300452, China

This research was financially supported by the National Natural Science Foundation of Chinaand National Science and Technology Major Project

417721242016ZX05007001-002

2019

地球化学学报(英文版)
中国科学院地球化学研究所

地球化学学报(英文版)

CSCDEI
影响因子：0.33
ISSN：2096-0956
年,卷(期)：2019.38(3)
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