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The abnormal distribution of the molecular fossils in the pre-Cambrian and Cambrian:its biological significance

Science China Earth Sciences 2002年第3期45卷 193-200页

作者：张水昌 J.Michael Moldowan Maowen Li 边立曾张保民王飞宇何忠华王大锐 Research Institute of Petroleum Exploration and Development of China Beijing 100083 China Key Laboratory of Petroleum Geochemistry China National Petroleum Corporation Beijing 100083 China

Dinosteranes and 4-methyl-24-ethylcholestanes are usually to be thought of as biomarkers for dinoflagellates, and 24-norcholestanes and C28 steranes for diatom. Therefore, the highest concentrations of these compounds are typically found in strata deposited since the beginning of the Mesozoic. However these compounds appeared widely and abundantly in extracts from organic-rich sediments in the Sinian and Cambrian of the Tarim Basin. This suggests that some of the planktonic algae such as dinoflagellates and diatoms have an earlier origin than the Mesozoic. Some of the remarkable algal fossils observed in the Cambrian, in both well He 4 and the outcrop section of Xiao-Er-Bulak, Tarim Basin, provide possible biological evidence for this kind of inference.

关键词： dinosteranes, triaromatic dinosteroids, 24-norcholestane, dinoflagellate, diatom, Cambrian, Tarim Basin.

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

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Chinese Science Bulletin 2002年第S1期47卷 20-27页

作者： ZHANG Shuichang LIANG Digang LI Maowen XIAO Zhongyao HE Zhonghua Key Laboratory of Petroleum Geochemistry Research Institute of Petroleum Exploration and DevelopmentChina National Petroleum CorporationBeijing 100083China Geological Survey of Canada 3303-33 st.NW CalgaryAlberta T2L 2A7Canada Research Institute of Petroleum Exploration and Development Tarim OilfieldKuerle 841000China

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.

关键词： molecular fossils dinosterane triaromatic dinosterane 24-norcholestane dinoflagellate Cambrian Upper Ordovician Tarim Basin.

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Typical end-member oil derived from Cambrian-Lower Ordovician source rocks in the Tarim Basin, NW China

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Petroleum Exploration and Development 2018年第6期45卷 1177-1188页

作者： BAO Jianping ZHU Cuishan WANG Zhifeng Key Laboratory of Oil & Gas Resource and Exploration Technology Geochemistry Department Yangtze University

Based on GC-MS data of saturate and aromatic hydrocarbon fractions in crude oils from Well TD 2 and the Yingmaili and Tazhong area in the Tarim Basin, the end-member oil derived from Cambrian-Lower Ordovician source rocks was determined. The analytical results show that the crude oil from Well TD2 is rich in 3-6 ring polycyclic aromatic hydrocarbons without alkyl group, suggesting that this oil was altered by an abnormally thermal event. It contains a complete series of normal alkanes and 25-norhopanes,

关键词： biomarkers triaromatic steroids polycyclic aromatic hydrocarbons end-member oil Tarim Basin

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