The dinoflagellate cyst Subtilisphaera from the Eocene of the Qaidam Basin,northwest China,and its implications for hydrocarbon exploration

作     者：Liming Ji~(a,b,c*),Fanwei Meng~d,Kui Yan~d,Zhiguang Song~c ~aKey Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China ~bBureau of Economic Geology,Jackson School of Geosciences,The University of Texas at Austin,Austin,TX 78713,USA ~cState Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China ~dState Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China 

会议名称：《中国科学院地质与地球物理研究所第11届（2011年度）学术年会》

会议日期：2012年

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the fund of the National Natural Science Foundation of China(No.40973033) the Earmarked Fund of the State Key Laboratory of Organic Geochemistry(No.OGL- 200917) the fund of the China Scholarship Council(No. 2007106304) 

关 键 词：Subtilisphaera Dinosterane source rock Xiaganchaigou Formation Qaidam Basin 

摘      要：Although an abundance of 4-methyl-sterane and dinosterane thought to derive from dinoflagellates,has been detected in the Palaeogene source rocks and crude oils in the Qaidam Basin,China,no unequivocal dinoflagellate cysts have been found previously in Cretaceous-Palaeogene terrestrial deposits in this basin, including the Xiaganchaigou *** study reports on a new discovery using detailed analysis of a dinoflagellate cyst assemblage,composed solely of Subtilisphaera,from the Xiaganchaigou Formation on the north margin of the Qaidam *** biomarkers 4-methylsterane and dinosterane in the corresponding fossil-bearing beds have also been detected,further validating the dependability of dinoflagellate *** fossils provide direct evidence of the dinoflagellate contribution to Palaeogene crude oil in the Qaidam Basin and fill a long-existing gap in oil-source correlation.