Geochemical constraints on mixed source and hydrocarbon filling process in theYingjisu Sag, Tarim Basin, Xinjiang
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.
作 者： PANG Lingyun CHANG Xiangchun WANG Mingzhen YU Xinghe MA Lixin DUAN Yunge 作者单位： PANG Lingyun,YU Xinghe(College of Energy Resources, China University of Geosciences, Beijing 100083, China)CHANG Xiangchun,WANG Mingzhen,MA Lixin,DUAN Yunge(College of Geo-science and Technology, Shandong University of Science and Technology, Qingdao 266510, 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： Yingjisu Sag geochemistry oil-source correlation multiple accumulation process