成果归属作者：

肖贤明 ; 高平

成果归属机构：

能源学院

作者：

Liu, Wei ; Xiao, Xianming ; Gao, Ping ; Zhao, Yanming ; Xing, Yijie ; Fan, Qizhang ; Meng, Guangming ; Li, Jinku ; Zhou, Qin ; Li, Tengfei ; Liu, Siyi

单位：

China Univ Geosci Beijing, Sch Energy Resources, Beijing 100083, Peoples R China;China Univ Geosci Beijing, Frontiers Sci Ctr Deep Time Digital Earth, Beijing 100083, Peoples R China;Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China

关键词：

PORE STRUCTURE CHARACTERIZATION; CARBON-DIOXIDE; ORGANIC-MATTER; SICHUAN BASIN; NIUTITANG FORMATION; FRACTAL CHARACTERISTICS; ELECTRON-MICROSCOPY; SIZE DISTRIBUTIONS; LONGMAXI FORMATION; YANGTZE PLATFORM

摘要：

CO2 displacement technology is considered as a dual beneficial strategy for enhancing shale gas recovery and achieving CO2 geological storage, holding particular practical significance for the development of low-pressure shale gas reservoirs. The pore characteristics of shales, particularly the connectivity and heterogeneity of nanopores, constitute key factors governing CO2 storage and displacement efficiency. In this study, the nanopore structure, connectivity and heterogeneity of shale samples from the Lower Cambrian shale gas reservoirs with low pressure in the Yichang area of western Hubei, China were investigated using the integrated method of lowpressure gas adsorption, field-emission scanning electron microscope and multiple fractal theory to assess the suitability for CO2-enhanced gas recovery and geological storage. The results show that the Lower Cambrian shales can be divided into two intervals according to lithological characteristics: the Lower interval dominated by siliceous shale and the upper interval primarily composed of mixed shale. Compared to the mixed shale, the siliceous shales exhibit higher porosity, more developed nanopores, superior pore connectivity and lower heterogeneity. The TOC content has a dominant control on the pore structure, connectivity and heterogeneity. The mineral composition mainly influences the connectivity and heterogeneity of non-micropores. By integrating the pore characteristics with the mineral reactivities, the siliceous shale with a high gas content is suitable for the CO2 displacement, whereas the mixed shale with a low gas content shows potential for CO2 geological storage. This work provides a basis of reservoir evaluation and lithofacies selection for implementing CO2 displacement to enhance shale gas recovery and achieve CO2 storage for the Lower Cambrian shale reservoirs in the Yichang area as well as other low-pressure shale gas reservoirs.

基金：

National Natural Science Foundation of China [42330811, 42030804, 42373051]; Science and Technology Leading Talents Team Funds for the Central Universities; Frontiers Science Center for Deep-time Digital Earth, China University of Geosciences (Beijing) (Fundamental Research Funds for the Central Universities [2652023001]

语种：

英文

DOI：

10.1016/j.fuel.2025.137047

来源：

FUEL,2026():.

出版日期：

2026-02-15

提交日期：

2025-11-15

引用参考：

Liu, Wei; Xiao, Xianming; Gao, Ping; Zhao, Yanming; Xing, Yijie; Fan, Qizhang; Meng, Guangming; Li, Jinku; Zhou, Qin; Li, Tengfei; Liu, Siyi. Nanopore characteristics of lower Cambrian shale based on gas adsorption and multifractal analysis: Implications for gas development and CO2 storage[J]. FUEL,2026():.