The geochemical characteristics and origin of crude oils in the Kekeya Oilfield,Xinjiang, China |
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| Authors: | Youjun Tang Ling Zan Dujie Hou Zhongyao Xiao |
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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]State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China [3]Department of Petroleum Geology, China University of Geosciences, Beijing 100083, China [4]Exploration andDevelopment Research Institute ofTarim Oilfield Company, Petrochina, Korla 841000, China |
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| Abstract: | GC/MS and GC/MS/MS techniques were employed to describe the characteristics of biomarker assem-blages in two sets of hydrocarbon source rocks,Jurassic and Permian,in southwestern Tarim,and the parameters for the classification of the two sets of hydrocarbon source rocks have been established. It is found that diahopane and C30-unknown terpane are abundant in Permian samples,the contents of diahopane in Jurassic samples are relatively low,and terpenoids have been detected in Jurassic samples but not in Permian source rock samples. Kekeya crude oils are abundant in diahopane and C30-unknown terpane. The results of fine oil-rock correlation indicated that Kekeya crude oils were derived mainly from the Permian hydrocarbon source rocks. However,a small amount of diterpenoid was detected in the crude oils,indicating that the Jurassic hydrocarbon source rocks also made a certain contribution to Kekeya crude oils. |
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| Keywords: | biomarker assemblage oil-rock correlation Kekeya Oilfield |
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