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Co-evolution of paleo-environment and bio-precursors in a Permian alkaline lake,Mahu mega-oil province,Junggar Basin:Implications for oil sources

引用

Science China Earth Sciences 2022年第3期65卷 462-476页

作者： Liuwen XIA Jian CAO Lizeng BIAN Wenxuan HU Tingting WANG Dongming ZHI Yong TANG Erting LI Department of Earth Sciences Nanjing UniversityNanjing 210023China PetroChina Xinjiang Oilfield Company Karamay 834000China

The co-evolution of paleo-environment and bio-precursors in alkaline lakes is of significance to understand the extreme environment system and associated enigmatic hydrocarbon *** we used organic petrology and biomarker geochemistry to investigate the bio-precursors in a Permian alkaline paleo-lake in the Mahu mega-oil province within about a hundred miles of the Mahu Sag,Junggar Basin,China,and its effect on oil generation and *** general,the bioprecursors in the alkaline lacustrine source rocks of the Fengcheng Formation were mainly bacteria and algae,with a low abundance of higher ***,these source rocks were mainly prone to oil *** distinctive hydrocarbongenerating bio-precursors—Dunaliella-like algae and cyanobacteria—were *** addition to fossil evidence for these bio-precursors,the former results in a high C_(28)/C_(29)sterane ratio andβ-carotane abundance,and the latter results in the formation of medium-chain monomethyl alkanes in terms of *** nature of the bio-precursors varied with the sedimentary paleo-environment,and was controlled by the salinity and stratification of the ***-type source rocks were deposited in the central area of the alkaline lake,and cyanobacteria-type source rocks were formed around the lake *** crude oils in different parts of the Mahu mega-oil province within about a hundred miles have different *** bio-precursors in the saline lacustrine source rocks were jointly controlled by the age and water salinity of the source *** physiological synthesis of carotenoids and sterols by haloalkaliphilic green algae may have affected the evolution of ancient green algae.

关键词： Green algae Dunaliella Cyanobacteria Bio-precursors Saline lacustrine basin terrestrial petroleum Mahu Sag

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