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Microscopic oil occurrence in high-maturity lacustrine shales:Qingshankou Formation,Gulong Sag,Songliao Basin

Petroleum Science 2023年第5期20卷 2726-2746页

作者： Jing-Ya Zhang Ru-Kai Zhu Song-Tao Wu Xiao-Hua Jiang Chang Liu Yi Cai Su-Rong Zhang Tian-Shu Zhang Research Institute of Petroleum Exploration and Development PetroChinaBeijing100083China

occurrence and mobility of shale oil are prerequisites for evaluating shale oil reserves and prioritizing exploration targets,particularly for heterogeneous lacustrine *** Qingshankou Formation in the Gulong Sag,Songliao Basin is a classic lacustrine pure shale reservoir that contains abundant shale oil *** predicted geological reserves of the shale are 1.268×10^(9) *** this study,field emission scanning electron microscope(FE-SEM),the modular automated processing system(MAPS),pyrolysisgas chromatography(Py-GC),low-pressure nitrogen gas adsorption(LPNA),Soxhlet extraction,pyrolysis,and 2-D nuclear magnetic resonance(NMR)were integrated to describe the shale oil components,microscopic occurrence,mobility,and the effective pore size ***,the related controlling factors are *** shale oil in the Qingshankou Fm exists dominantly in the matrix pores of the clay minerals,with small amounts distributed in the intergranular pores of terrigenous clastic grains,intercrystalline pores of pyrite,intragranular pores of ostracod shells,and *** oil is distributed in the pore spaces of variable sizes in different *** clay mineral-laminated shales are characterized by the broadest range of pore size and largest volume of pore spaces with shale oil distribution,while the ostracod-laminated shales have limited pore spaces retaining ***,the proposed integrated analysis evaluates the shale oil molecules existing in two states:movable,and adsorbed oil,*** result illustrates that movable oil takes up 30.6%e79.4%of the total residual ***,mineral composition,and pore structures of the shale joint together to control the states and mobility of the shale *** values are positively correlated with the quantities of shale oil regardless of the state of *** mineral components significantly impact the state of shale *** differences in the states of oil were observed following

关键词： Shale oil content occurrence states Micro-oil distribution Effective pore spaces Controlling factors Gulong sag

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