Hydrocarbon generation from lacustrine shales with retained oil during thermal maturation

作     者：Xin-He Shao Xiong-Qi Pang Mao-Wen Li Zhi-Ming Li Yi Zhao Xin-He Shao;Xiong-Qi Pang;Mao-Wen Li;Zhi-Ming Li;Yi Zhao

作者机构：State Key Laboratory of Petroleum Resources and ProspectingChina University of PetroleumBeijing 102249China College of GeosciencesChina University of PetroleumBeijing 102249China State Key Laboratory of Shale Oil and Shale Gas Resources and Eff ective DevelopmentSINOPEC Petroleum Exploration and Production Research InstituteBeijing 100083China SINOPEC Key Laboratory of Petroleum Accumulation MechanismsWuxi Institute of Petroleum GeologyWuxi 214126JiangsuChina 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2020年第17卷第6期

页      面：1478-1490页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 082002[工学-油气田开发工程] 

基　　金：funded by National Natural Science Foundation of China(No.41872148) China Major Research and Development Program for Oil and Gas(No.2017ZX05049001) financial supporting from China Scholarship Council and American Association of Petroleum Geologists(Norman H.Foster Memorial Grant) 

主　　题：MSSV pyrolysis Hydrocarbon generation Lacustrine shales Thermal maturation Retained oil 

摘      要：Thermal maturation in the shale oil/gas system is inherently complex due to the competitive interplays between hydrocarbon generation and retention *** study hydrocarbon generation characteristics from shales within different stages of thermal maturation under the influence of retained oil,we performed Micro-Scale Sealed Vessels(MSSV)pyrolysis on a set of artificially matured lacustrine shale s amples from the Shahejie Formation in the Dongpu Depression in Bohai B ay Basin,*** results show that hydrocarbon yields of shale samples with or without retained oil at various thermal maturities follow different evolution *** components(C15+)in samples crack at high temperatures and generally follow a sequence,where they first transform into C6-14 then to C2-5 and *** accounts for most of the gaseous products at high temperatures in all samples,with different *** cracking of C2-5 is the main methane-generating process in samples with retained oil,whereas the source of methane in samples without retained oil is *** the studied shales,retained oils at early-mature stage retard the transformation of liquid to gaseous hydrocarbon and prompt the cracking of C2-5 to C1 to some *** reaction related to gypsum in the studied samples is the primary reason that can explain the loss of hydrocarbon yields,especially at high *** addition,transformation of volatile hydrocarbons to gas and coke also accounts for the loss of generated hydrocarbon,as a secondary factor.