河南理工大学学报（自然科学版）2024，Vol.43Issue(5)：53-66,14.DOI:10.16186/j.cnki.1673-9787.2022030039
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
Pore structure characteristics and evolution laws of coal-measure shale in the Shanxi Formation,eastern the Ordos Basin
摘要
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).Meso-pores 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 cer-tain 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 com-paction and clay mineral transformation,while the pores of S-3 shale are significantly influenced by cemen-tation,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 refer-ence and guidance for the study of pore structure of coal-measure shale in the Ordos Basin.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Key words
lithofacies type/pore structure/diagenesis/coal-measure shale/eastern Ordos Basin分类
天文与地球科学引用本文复制引用
乔雨,宋党育,刘惟庆,余震..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):53-66,14.基金项目
国家自然科学基金资助项目(U2003104,42272210) （U2003104,42272210）
河南省高校基本科研业务费专项项目(NSFRF240311,NSFRF-240319) （NSFRF240311,NSFRF-240319）
河南省高等学校重点科研项目(24A440010) （24A440010）
