Effect of Composition on the Micropore Structure of Non-Marine Coal-Bearing Shale: A Case Study of Permian Strata in the Qinshui Basin, China

被引:1
作者
Yu, Kun [1 ,2 ]
Ju, Yiwen [1 ]
Yang, Yanhui [3 ,4 ]
Qiao, Peng [1 ]
Li, Wuyang [1 ]
Ju, Liting [1 ]
Zhu, Hongjian [1 ]
Huang, Cheng [1 ]
Feng, Hongye [1 ]
机构
[1] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
[2] China Univ Min & Technol, Key Lab Coalbed Methane Resources & Reservoir For, Minist Educ, Xuzhou 221008, Jiangsu, Peoples R China
[3] China Natl Petr Corp, Coal Bed Methane Explorat & Dev Pilot Test Base, Renqiu 062552, Peoples R China
[4] PetroChina, PetroChina Huabei Oilfield Co, Renqiu 062552, Peoples R China
关键词
Composition; Clay Minerals; Micropore; Non-Marine Shale; Coal; PORE-SIZE DISTRIBUTION; FRACTAL CHARACTERISTICS; ORGANIC-MATTER; SICHUAN BASIN; GAS-STORAGE; MATRIX PERMEABILITY; MIGRATION PATHWAYS; ORDOS BASIN; BIB-SEM; ADSORPTION;
D O I
10.1166/jnn.2021.18563
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The nanopore network in organic-rich shale plays a key role in shale gas storage and migration, and micropores are an important structural unit in connecting the migration channel. In this study, we selected six non-marine coal-bearing shales from the Qinshui Basin to investigate the effect of composition on micropore structure using X-ray diffraction, total organic carbon (TOC), vitrinite reflectance, and CO2 adsorption methods. The results indicate that non-marine shale with higher TOC content possesses more micropores, leading to a more complex pore structure and improving the heterogeneity of shale reservoirs. With the increase in TOC content, the micropore surface area and micropore volume clearly increases, which greatly improves the gas storage space in shale reservoirs. The thermal evolution of organic matter promotes the development of micropores to a certain extent in non-marine shale. Clay minerals possess a rough surface and develop more micropores, and their influence on the micropore structure of non-marine shale is relatively strong, while terrestrial quartz exhibits significant micropore development. The obviously positive correlations between micropore volume and kaolinite, chlorite contents in the non-marine shale suggest that kaolinite and chlorite make a certain contribution to micropore volume. The characteristics of micropore structures in coal mainly depend on lithotypes, TOC content, and ash content, while clay content, quartz content, and TOC content are the key factors controlling the formation of micropores in non-marine shale.
引用
收藏
页码:741 / 749
页数:9
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