乔雨, 宋党育, 刘惟庆,等.鄂尔多斯盆地东缘山西组煤系页岩孔隙结构特征及其演化规律研究[J].河南理工大学学报（自然科学版）,2024,43(5):53-66.

QIAO Y, SONG D Y, LIU W Q,et al.Pore structure characteristics and evolution laws of coal-measure shale in the Shanxi Formation，eastern the Ordos Basin[J].Journal of Henan Polytechnic University(Natural Science) ,2024,43(5):53-66.

鄂尔多斯盆地东缘山西组煤系页岩孔隙结构特征及其演化规律研究

乔雨1, 宋党育1,2, 刘惟庆1, 余震1

1.河南理工大学 资源环境学院，河南 焦作 454000;2.河南理工大学 中原经济区煤层（页岩）气河南省协同创新中心，河南 焦作 454000

摘要: 目的 为了解煤系页岩中孔隙结构特征及其演化规律，  方法 采用X射线衍射、岩石热解、扫描电镜、低压CO2/N2吸附和高压压汞等实验，对鄂尔多斯盆地东缘山西组煤系页岩不同岩相孔隙结构进行表征，分析成岩作用对各岩相孔隙演化的影响。  结果 结果表明，山西组主要发育富硅泥质页岩岩相（A-1）、泥质/硅质混合页岩岩相（M-2）和富黏土硅质页岩岩相（S-3）；介孔是储层孔容的主要来源，贡献度达65％以上，微孔是储层比表面积的主要来源，贡献度达62％以上；S-3页岩总孔容和总比表面积均较大，均值分别为0.036 2 cm³/g，35.15 cm²/g，A-1页岩总孔容和总比表面积均较小，均值分别为0.026 6 cm³/g，21.39 cm²/g；有机质通过控制微孔发育对页岩比表面积起控制作用，另外，黏土矿物对页岩比表面积有一定促进作用，黄铁矿对M-2页岩和S-3页岩孔隙结构均有一定促进作用；A-1页岩孔隙演化受压实作用、黏土矿物转化作用最为明显，S-3页岩孔隙受胶结作用、有机质生烃作用和溶蚀作用影响均较显著，M-2页岩孔隙兼具A-1和S-3页岩的成岩演化特点。  结论 研究结果可为鄂尔多斯盆地煤系页岩孔隙结构研究提供借鉴与参考。

关键词:岩相类型;孔隙结构;成岩作用;煤系页岩;鄂尔多斯盆地东缘

doi:10.16186/j.cnki.1673-9787.2022030039

基金项目:国家自然科学基金资助项目（U2003104，42272210）；河南省高校基本科研业务费专项项目（NSFRF240311，NSFRF-240319）；河南省高等学校重点科研项目（24A440010）

收稿日期:2022/03/15

修回日期:2022/04/18

出版日期:2024/07/31

Pore structure characteristics and evolution laws of coal-measure shale in the Shanxi Formation，eastern the Ordos Basin

QIAO Yu1, SONG Dangyu1,2, LIU Weiqing1, YU Zhen1

1.School of Resources and Environment，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region，Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract: Objectives In order to clarify the development and evolution laws of pores structure in coal-measure shale， Methods this study used X-ray diffraction，rock pyrolysis，scanning electron microscope，low-pressure CO2/N2 gas adsorption and high-pressure mercury intrusion experiments to characterize the pore structure of various lithofacies in Shanxi Formation coal-measure shale in the eastern Ordos Basin.  Results The research shows that the Shanxi Formation mainly develops silica-rich argillaceous shale lithofacies（A-1），siliceous/argillaceous mixed shale lithofacies（M-2），and clay-rich siliceous shale lithofacies（S-3）.Mesopores are the main origin of pore volume，with a contribution of more than 65%，while micropores are the main origin of reservoir specific surface area，with a contribution of more than 62%.The total pore volume and total specific surface area of the S-3 shale are larger，with an average value of 0.036 2 cm³/g and 35.15 cm²/g，respectively，while the total pore volume and total specific surface area of the A-1 shale are smaller，with an average value of 0.026 6 cm³/g and 21.39 cm²/g，respectively.Organic matter controls the specific surface area of the shale by controlling the development of micropores.In addition，Clay minerals have a certain positive effect on the specific surface area of the shale，while pyrite has a certain promoting effect on the pore structure of M-2 and S-3 shale.The pore evolution of A-1 shale is most obviously affected by compaction and clay mineral transformation，while the pores of S-3 shale are significantly influenced by cementation，organic hydrocarbon generation and dissolution.The pores of M-2 shale exhibit both the diagenetic evolution characteristics of A-1 pores and S-3 shale.  Conclusions The research results can provide reference and guidance for the study of pore structure of coal-measure shale in the Ordos Basin.

Key words:lithofacies type;pore structure;diagenesis;coal-measure shale;eastern Ordos Basin