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Molecular fossils and oil-source rock correlations in Tarim Basin, NW China

Molecular fossils and oil-source rock correlations in Tarim Basin, NW China

作     者:ZHANG Shuichang LIANG Digang LI Maowen XIAO Zhongyao HE Zhonghua 

作者机构:Key Laboratory of Petroleum GeochemistryResearch Institute of Petroleum Exploration and DevelopmentChina National Petroleum CorporationBeijing 100083China Geological Survey of Canada3303-33 st.NW CalgaryAlberta T2L 2A7Canada Research Institute of Petroleum Exploration and DevelopmentTarim OilfieldKuerle 841000China 

出 版 物:《Chinese Science Bulletin》 (Chin. Sci. Bull.)

年 卷 期:2002年第47卷第S1期

页      面:20-27页

核心收录:

学科分类:081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基  金:国家科技攻关项目 

主  题:molecular fossils dinosterane triaromatic dinosterane 24-norcholestane dinoflagellate Cambrian Upper Ordovician Tarim Basin. 

摘      要:The distribution of molecular fossils (bio-markers) of steroid compounds in extracts from some spe-cific geologic age in the Tarim Basin have been analyzed andare used as the fingerprints for the oil-source rock correla-tion. Having been affected by maturation, migration, phasefractionation and biodegradation, not any molecular fossilsrelated to source and environment can be used as the finger-prints for oil-source rock correlation. Some special bio-markers widely existed in the extracts from Cambrian andOrdovician rocks in the Tarim Basin and showed obviousdifference in each stratum, including dinosteranes (C30),4-methyl-24-ethyl-cholestanes (C30) and their aromatizedsteroids, C24-norcholestanes and C28 steranes originated fromdinoflagellates and diatom. Few oils such as the heavy oildrilled in the Cambrian reservoir from Tadong 2 well (TD2)correlated well with the extracts from the Cambrian. Theamazing similarity of the relative contents of these com-pounds between the marine oils produced in Tazhong andTabei uplifts and the extracts from the Upper Ordoviciansuggests that the Middle-Upper Ordovician is the very likelymain source for the marine oils.

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