Geochemical characteristics and origin of reservoir bitumens from Well Zhong 1 in the Katake Uplift,Tarim Basin  

作　　者：TANG Youjun ZAN Ling 

机构地区：[1]Department of Geochemistry, Key Laboratory of Exploration Technologies for Oil and Gas Resources, Yangtze University, Jingzhou 434023, China [2]Faculty of Natural Resources & Information Technology, China University of Petroleum, Beijing 102249, China

出　　处：《Chinese Journal Of Geochemistry》2011年第3期398-404,共7页中国地球化学学报

基　　金：funded by the National Natural Science Foundation of China(Grant No.40773039);the Open Fund(Grant No.DMSM 200806) of Key Laboratory of Depositional Mineralization & Sedimentary Mineral(Shandong University of Science and Technology);Shandong Province,and Natural Science Foundation of Hubei Province of China(Grant No.2010CDB04306);CNPC Innovation Foundation the Open Fund(Grant No.2010D-5006-0105);also funded by the open fund(Grant No.2009005) of the State Key Laboratory of Petroleum Resource and Prospecting

摘　　要：The source of marine crude oils from Tarim Basin is still disputed.However,research on the reservoir bitumens may provide a piece of new evidence to elucidate oil source.Geochemical characteristics of reservoir bitumens from different strata from Well Zhong 1 in the Katake Uplift were discussed here in detail.Pr/Ph ratios of reservoir bitumen from Well Zhong 1 range from 1.14 to 1.39,CPI ratios from 1.01 to 1.08,which indicates no odd-even predominance of normal alkanes,with OEP ratios ranging from 0.98 to 1.05.The contents of gammacerane and C28 sterane of reservoir bitumen from Well Zhong 1 are low,while dibenzothiophene series are abundant.Ster-ane isomerization maturity parameter and Ts/(Ts+Tm) ratio indicate that the reservoir bitumen from Well Zhong1 is mature to highly mature.Based on the differences in biomarker distribution,it is concluded that reservoir bitumen from Well Zhong 1,of which molecular parameters are contrary to those in Cambrian oil from Well Tadong 2,origi-nated from the Upper Ordovician source rocks.The source of marine crude oils from Tarim Basin is still disputed. However, research on the reservoir bitumens may provide a piece of new evidence to elucidate oil source. Geochemical characteristics of reservoir bitumens from different strata from Well Zhong 1 in the Katake Uplift were discussed here in detail. Pr/Ph ratios of reservoir bitumen from Well Zhong 1 range from 1. 14 to 1.39, CPI ratios from 1.01 to 1.08, which indicates no odd-even predominance of normal alkanes, with OEP ratios ranging from 0.98 to 1.05. The contents of gammacerane and C28 sterane of reservoir bitumen from Well Zhong 1 are low, while dibenzothiophene series are abundant. Sterane isomerization maturity parameter and Ts/（Ts＋Tm） ratio indicate that the reservoir bitumen from Well Zhongl is mature to highly mature. Based on the differences in biomarker distribution, it is concluded that reservoir bitumen from Well Zhong 1, of which molecular parameters are contrary to those in Cambrian oil from Well Tadong 2, originated from the Upper Ordovician source rocks.

关 键 词：地球化学特征 塔里木盆地 储层沥青 隆起 起源 成熟度参数 二苯并噻吩 生物标志物 

分 类 号：P618.51[天文地球—矿床学] P618.130.1[天文地球—地质学]