Molecular fossils and sources of Cambrian heavy oil of Well Tadong-2 in the Tarim Basin,Xinjiang, China |
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| Authors: | Youjun Tang Ling Zan |
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| Institution: | (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 |
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| Abstract: | 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, benzoa]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. |
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| Keywords: | molecular fossil oil-source rock correlation thermal alteration heavy oil Tarim Basin |
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