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  4. 中国科学院页岩气与地质工程重点实验室
Multiscale characterization of pore structure and connectivity of Wufeng-Longmaxi shale in Sichuan Basin, China

文献类型：期刊论文

作者Wu, Jianguo3,4; Yuan, Yuan3,4; Niu, Suyun3,4; Wei, Xiangfeng1; Yang, Jijin2,3,4
刊名MARINE AND PETROLEUM GEOLOGY
出版日期2020-10-01
卷号120页码:19
关键词Shale Wufeng-longmaxi Pore structure Connectivity Multiscale
ISSN号0264-8172
DOI10.1016/j.marpetgeo.2020.104514
英文摘要By combining the micro-CT, SEM, FIB-SEM and FIB-HIM, a multiscale characterization method was explored to study the pores in Wufeng-Longmaxi shale, Sichuan Basin, China. This method extends the previous test scale so that the sub-10 nm pores can be visualized in both 2D and 3D. In order to consider the homogeneity or heterogeneity and verify the representativeness of samples, REV and REA (representative elementary volume and area) was determined. Pores in shale were classified as organic pore, inorganic pore and micro-fracture based on SEM, and their surface porosity and pore size distribution were calculated. By 3D reconstruction of FIB-SEM and FIB-HIM, the pore networks were visualized down to sub-10 nm, and the connect patterns of pores through throats were carefully investigated. Results show that, REV and REA are different at different scale. The cube and square growing pattern, grain size, feature distribution and imaging accuracy can affect REV and REA in different degree. SEM quantification results indicate that, the surface porosities of OM particles (phi(S) (OM)) of two 1st member of Longmaxi samples are larger than those of Wufeng samples, indicating the organic pores of 1st member of Longmaxi samples are more developed than Wufeng samples. The size of inorganic pores of Wufeng samples are larger than those of Longmaxi samples. The permeability shows a positive correlation with surface density of micro-fractures. The 3D pore network analysis of FIB-SEM further shows the interconnectivity of 1st member of Longmaxi samples are better than Wufeng samples. The interconnected pores are mainly between 10 and 30 nm, and the throats are concentrated between 0 and 30 nm for both 1st member of Longmaxi samples and Wufeng samples. This is further refined by FIB-HIM, in which, the interconnected pores and throats are concentrated below 10 nm. FIB-HIM also provides clear 3D images of how organic pores can be connected by throats, which is a great progress in shale pore characterization.
WOS关键词HIGH THERMAL MATURITY ; GAS-ADSORPTION ; GEOCHEMICAL CHARACTERISTICS ; SCALE PORES ; FIB-SEM ; NANO-CT ; FE-SEM ; MARINE ; CLASSIFICATION ; TOMOGRAPHY
资助项目Chinese National Science and Technology Major Project[2017ZX05035] ; Chinese National Science and Technology Major Project[2016ZX05034] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB10050100] ; Chinese National Natural Science Foundation of China[U1562215]
WOS研究方向Geology
语种英语
WOS记录号WOS:000569006200003
出版者ELSEVIER SCI LTD
资助机构Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China ; Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China ; Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China ; Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Chinese National Science and Technology Major Project ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China ; Chinese National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/98245]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Yang, Jijin
作者单位1.SINOPEC Explorat Co, Chengdu 610041, Sichuan, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Wu, Jianguo,Yuan, Yuan,Niu, Suyun,et al. Multiscale characterization of pore structure and connectivity of Wufeng-Longmaxi shale in Sichuan Basin, China[J]. MARINE AND PETROLEUM GEOLOGY,2020,120:19.
APA Wu, Jianguo,Yuan, Yuan,Niu, Suyun,Wei, Xiangfeng,&Yang, Jijin.(2020).Multiscale characterization of pore structure and connectivity of Wufeng-Longmaxi shale in Sichuan Basin, China.MARINE AND PETROLEUM GEOLOGY,120,19.
MLA Wu, Jianguo,et al."Multiscale characterization of pore structure and connectivity of Wufeng-Longmaxi shale in Sichuan Basin, China".MARINE AND PETROLEUM GEOLOGY 120(2020):19.

入库方式： OAI收割

来源：地质与地球物理研究所

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