Geochemical constraints on mixed source and hydrocarbon filling process in the Yingjisu Sag,Tarim Basin,Xinjiang |
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Authors: | Lingyun Pang Xiangchun Chang Mingzhen Wang Xinghe Yu Lixin Ma Yunge Duan |
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Institution: | (1) College of Energy Resources, China University of Geosciences, Beijing, 100083, China;(2) College of Geo-science and Technology, Shandong University of Science and Technology, Qingdao, 266510, China |
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Abstract: | The Yingjisu Sag was petroliferous for normal oil, condensate oil, reservoir bitumen and natural gases. Geochemical studies
showed that natural gases in the Yingjisu Sag were a gas mixture consisting mainly of Cambrian pyrolysis gas, Jurassic condensate
oil in well Yingnan 2 and normal oil in well Tadong 2, reflecting the characteristics of marine-phase gases and oils, while
crude oils in well Longkou 1 demonstrated the characteristics of both marine and terrestrial oils, which were derived from
lower algae and higher plants. Jurassic oils from wells Longkou 1 and Huayingcan 1 and Cambrian crude oils from well Tadong
2 were derived mainly from Cambrian-Lower Ordovician source rocks. Jurassic and Silurian reservoir bitumens from well Yingnan
2 were biodegradated, suggesting they are of marine and terrestrial origins. The bitumens have similar geochemical characteristics,
which are correlated well with Ordovician crude oils from well Tadong 2 and Jurassic condensate oil from well Yingnan 2. Based
on the characteristics of tectonic evolution in this area and the analysis of hydrocarbon accumulation, the constraints on
the mixed source and hydrocarbon filling process in the Yingjisu Sag were brought forward. |
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Keywords: | Yingjisu Sag geochemistry oil-source correlation multiple accumulation process |
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