Molecular fossils and sources of Cambrian heavy oil of Well Tadong-2 in theTarim Basin,Xinjiang,China  

作　　者：TANG Youjun ZAN Ling 

机构地区：[1]Key Laboratory of Exploration Technologies for Oil and Gas Resources, Department of Geochemistry, Yangtze University, Jingzhou 434023, China [2]Faculty of Natural Resources ＆ Information Technology, China University of Petroleum, Beijing 102249, China

出　　处：《Chinese Journal Of Geochemistry》2009年第3期314-319,共6页中国地球化学学报

基　　金：funded by the National Natural Science Foundation of China (Grant No. 40773039)

摘　　要：Research on the molecular fossil characteristics of heavy oil from Well Tadong-2 is of great importance to constrain the source of marine crude oils in the Tarim Basin, Xinjiang, China. The authors synthetically applied the isotope mass spectrograph, chromatography and chromatography-mass spectrography to the studies of molecular fossil characteristics of heavy oil from Well Tadong-2 in the Tarim Basin, and the results obtained revealed that heavy oil from Well Tadong-2 is characterized by high gammacerane, high C28 sterane, low rearranged sterane and high C27-triaromatic steroid, these characteristics are similar to those of Cambrian-Lower Ordovician source rocks, demonstrating that Cambrian crude oils came from Cambrian-Lower Ordovician source rocks; condensed compounds (fluoranthene, pyrene, benzo[a]anthracene, bow, benzo fluoranthene, benzopyrene) of high abundance were detected in heavy oil from Well Tadong-2, and the carbon isotopic values of whole oil are evidently heavy, all the above characteristics revealed that hydrocarbons in the crude oils became densified in response to thermal alteration.Research on the molecular fossil characteristics of heavy oil from Well Tadong-2 is of great importance to constrain the source of marine crude oils in the Tarim Basin, Xinjiang, China. The authors synthetically applied the isotope mass spectrograph, chromatography and chromatography-mass spectrography to the studies of molecular fossil characteristics of heavy oil from Well Tadong-2 in the Tarim Basin, and the results obtained revealed that heavy oil from Well Tadong-2 is characterized by high gammacerane, high C28 sterane, low rearranged sterane and high C27-triaromatic steroid, these characteristics are similar to those of Cambrian-Lower Ordovician source rocks, demonstrating that Cambrian crude oils came from Cambrian-Lower Ordovician source rocks; condensed com- pounds （fluoranthene, pyrene, benzo[a]anthracene, bow, benzo fluoranthene, benzopyrene） of high abundance were detected in heavy oil from Well Tadong-2, and the carbon isotopic values of whole oil are evidently heavy, all the above characteristics revealed that hydrocarbons in the crude oils became densified in response to thermal alteration.

关 键 词：分子化石 重油 井塔 新疆 中国 m盆地 同位素质谱仪 塔里木盆地 

分 类 号：P532[天文地球—古生物学与地层学] TE626.25[天文地球—地质学]