Molecular fossils and sources of Cambrian heavy oil of Well Tadong-2 in theTarim Basin, Xinjiang, China
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.
作 者： TANG Youjun ZAN Ling 作者单位： TANG Youjun(Key Laboratory of Exploration Technologies for Oil and Gas Resources, Department of Geochemistry, Yangtze University, Jingzhou 434023, China;Faculty of Natural Resources & Information Technology, China University of Petroleum, Beijing 102249, China)ZAN Ling(Faculty of Natural Resources & Information Technology, China University of Petroleum, Beijing 102249, China)
刊 名： 中国地球化学学报（英文版） 英文刊名： CHINESE JOURNAL OF GEOCHEMISTRY 年，卷(期)： 2009 28(3) 分类号： P5 关键词： molecular fossil oil-source rock correlation thermal alteration heavy oil Tarim Basin