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An Improved Method for Evaluating Hydrocarbon Generation of Shale:A Case Study of the Lower Cretaceous Qingshankou Formation Shale in the Songliao Basin

查看全文 作　　者：ZHANG [1,2]Yuchen;WANG [1,2]Min;LI [1,2]Jinbu;ZHAO [1,2]Chen;YAN [1,2]Yu;XU [3]Liang;DENG [1,2]Zixiao 高影响力作者 机构地区：[1]National Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao,Shandong 266580,China;[2]School of Geosciences,China University of Petroleum(East China),Qingdao,Shandong 266580,China;[3]Exploration and Development Research Institute of PetroChina Daqing Oilfield Company,Daqing,Heilongjiang 163712,China高影响力机构 出　　处：《Acta Geologica Sinica(English Edition)》索引2023年第97卷第6期,共11页高影响力期刊 基　　金：funded by the National Natural Science Foundation of China(Grant No.42072147);the Qingdao Postdoctoral Science Foundation(Grant No.ZX20210070)。 摘　　要：Because of the influence of hydrocarbons,especially adsorbed hydrocarbons,on the detection of cracked hydrocarbon(S2)and total organic carbon(TOC),the hydrogen index(HI)-based hydrocarbon generation model deviates from actual practice.In this study,the shale in the first member of the Qingshankou Formation in the central depression of the Songliao Basin,where in northeastern China,was taken as the research object and a correction method for S2 and TOC was established.By correcting the experimental results of different maturity samples,the actual hydrocarbon generation model has been revealed,the differences before and after correction compared,and the evolutionary characteristics of the adsorbed hydrocarbon content were clarified.The results show that the organic matter enters the hydrocarbon generation threshold at R_(o)-0.5% and reaches the hydrocarbon generation peak at R_(o)-1.0% and that the hydrocarbon generation process ends at R_(o)-1.3%.The hydrocarbon generation model established based on the measured values has a‘lag effect’compared to actual values,and this extends the hydrocarbon generation window of organic matter and delays the hydrocarbon generation peak.With the increase of maturity,adsorbed hydrocarbon content shows the characteristics of‘first increasing,then stabilizing,and then decreasing’,and reache s the most abundant stage at Roof 0.9%-1.3%. 关 键 词：hydrocarbon generation hydrogen index correction adsorbed hydrocarbon shale oil Qingshankou Formation Heilongjiang Province
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