Molecular geochemical characteristics of gas source rocks from the Upper Triassic Xujiahe Formation indicate transgression events in the Sichuan Basin

查看全文 作　　者：ZHANG [1,2]Min;HUANG [1,2]GuangHui;LI [1,2]HongBo;HU [3]GuoYi;ZHANG [3]ShuiChang

机构地区：[1]Department of Geochemistry,Yangtze University,Jingzhou 434023,China;[2]Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Jingzhou 434023,China,;[3]Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China

出　　处：《Science China Earth Sciences》索引2012年第55卷第8期,共9页

基　　金：supported by National Science and Technology Major Pro-jects(Grant No.2008ZX05007-001);National Natural Science Foun-dation of China (Grant No.40973041) 摘　　要：The geochemical characteristics of saturated and aromatic hydrocarbons from different formations and lithologies provide ob-vious evidence for transgressions that occurred during Upper Triassic Xujiahe stage in Sichuan Basin with a great impact on the source input and depositional environment.A clear dual peak distribution for normal alkanes and obvious abundant com-pounds sourced from bacteria and algae in whole oil gas chromatogram indicates the abundance of lower organisms input.The ratio of Pr/Ph is low,ranging from 0.33 to 0.86 with an average of 0.60,quite different from Pr/Ph >2.0 for coal measures in swamp environment,representing source rocks from saline lake or marine facies.In the gas source rocks extracts,abundant β-carotane,-carotane,and their degradated series were detected in the whole oil chromatogram,indicating a reducing envi-ronment.The concentrations of methyl steranes and dinosteranes are high.The content of polycyclic aromatic sulfur heterocy-cles(PASH) is relatively higher in aromatic fraction and the assemblage of fluorene,dibenzofuran,and dibenzothiophene is different from the typical saline lake and the regular swamp facies source rocks,manifesting the transgression effects on gas source rocks. 关键词：分子地球化学须家河组上三叠统四川盆地气源岩海侵事件特征表海相烃源岩

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Molecular geochemical characteristics of gas source rocks from the Upper Triassic Xujiahe Formation indicate transgression events in the Sichuan Basin

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