Abstract The role of residual bitumen on the pore structure of organic-rich shales is related to maturity. However, the studies about the role of the soluble and insoluble residual bitumen on the pore structure of organic-rich shales from low to over mature are deficient. In this study, non-extracted and extracted organic-lean shale, organic-rich shale and coal samples after the hydrous pyrolysis are used to investigate the role of residual bitumen on the pore structure of the organic-rich shales from low to over mature. The specific surface areas of shale and coal samples from low to over mature increase after the solvent extraction. For the organic-lean shale samples from low to over mature and the organic-rich shale samples (lower than 1.51% Ro), the increments of the specific surface area are in proportion to the extractable organic matter (EOM) contents. For the coal samples from low to over mature and the organic-rich shale samples (higher than 1.51% Ro), there is no positive relationship between the increments of the specific surface area and the EOM contents. The increments of pore volumes are obvious in the organic-rich shale samples from mature to high mature and coal samples at wet gas and dry gas stage. The blocking of soluble residual bitumen on inorganic nano-pores depends on the EOM content and will reach the top at the maximum EOM content or the oil peak while the blocking of soluble residual bitumen on organic nano-pores does not depend on the EOM content and will reach the top at over mature. From low mature to mature, the soluble residual bitumen only blocks inorganic nano-pores. From high to over mature, the blocking on inorganic nano-pores gradually becomes weak while the blocking on organic nano-pores gradually increases. The scanning electron microscopy observations and the thermal evolutions of the specific surface area/pore volume of the non-extracted organic-rich shale and coal samples indicate that the organic nano-pores of the insoluble residual bitumen are undeveloped from low mature to mature and more and more developed from high to over mature.

中文翻译：

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残余沥青对低成熟到过成熟富有机质页岩孔隙结构的影响——对含水热解后页岩和煤样的洞察

摘要 残余沥青对富有机质页岩孔隙结构的影响与成熟度有关。然而，关于可溶性和不溶性残余沥青对低成熟到过成熟富有机质页岩孔隙结构的影响的研究还很缺乏。本研究利用含水热解后未提取和提取的贫有机页岩、富有机页岩和煤样，研究残余沥青对低成熟到过成熟富有机页岩孔隙结构的影响。溶剂萃取后页岩和煤样的比表面积从低成熟到过成熟增加。对于从低到过成熟的贫有机页岩样品和富有机质页岩样品（低于 1.51% Ro），比表面积的增加与可萃取有机物 (EOM) 的含量成正比。对于从低到过成熟的煤样和富含有机质页岩样品（高于 1.51% Ro），比表面积的增加与 EOM 含量之间没有正相关关系。从成熟到高成熟期的富有机质页岩样品以及湿气和干气阶段的煤样，孔隙体积增量明显。可溶性残余沥青对无机纳米孔的堵塞取决于EOM含量，将在最大EOM含量或油峰处达到顶峰，而可溶性残余沥青对有机纳米孔的堵塞不取决于EOM含量和将在过度成熟时达到顶峰。从低成熟到成熟，可溶性残留沥青只会堵塞无机纳米孔。从高到过成熟，对无机纳米孔的阻塞逐渐减弱，而对有机纳米孔的阻塞逐渐增强。扫描电镜观察和未提取的富含有机质页岩和煤样的比表面积/孔体积的热演化表明，不溶性残余沥青的有机纳米孔从低成熟到成熟多不发育并且更多地从高发展到过度成熟。