Characterization of Pore Structures of Jiulaodong Formation Shale in the Sichuan Basin by SEM with Ar-ion Milling
Microscopic pore structure is the key to studying shale gas reservoirs. Traditional Scanning Electron Microscope cannot be used to identify topographic irregularities caused by differential hardness of components during mechanical polishing. Microscopic pore structures of Jiulaodong formation shale...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Science Press, PR China
2015-05-01
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| Series: | Yankuang ceshi |
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| Online Access: | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.2015.03.003 |
| _version_ | 1811168509537812480 |
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| author | WANG Yu JIN Chan WANG Li-hua WANG Jian-qiang JIANG Zheng WANG Yan-fei PU Jie |
| author_facet | WANG Yu JIN Chan WANG Li-hua WANG Jian-qiang JIANG Zheng WANG Yan-fei PU Jie |
| author_sort | WANG Yu |
| collection | DOAJ |
| description | Microscopic pore structure is the key to studying shale gas reservoirs. Traditional Scanning Electron Microscope cannot be used to identify topographic irregularities caused by differential hardness of components during mechanical polishing. Microscopic pore structures of Jiulaodong formation shale in the Weiyuan area of the Sichuan basin were investigated using scanning electron microscope coupled with an Ar-ion milling technique. Three types of pores were identified: (1) mineral matrix pores (pore diameters are mostly 100-500 nm), mainly including interparticle pores and intraplatelet pores within clay aggregates, and intercrystalline pores within pyrite/anatase and biological pores; (2) organic matter pores (pore diameters range from tens of nanometers to several micrometers), either controlled by thermal evolution of kerogen or clay minerals coated by organic matter; (3) micro fractures (with length of dozens of micrometers and width of a few micrometers), including shrinkage fracture, tectonic fracture, overpressure fracture and artificial fracture. In conclusion, micro-nano pores in Jiulaodong shale are mainly composed of mineral matrix pores and micro fractures which provide the main storage space and flow channel for shale gas. |
| first_indexed | 2024-04-10T16:27:25Z |
| format | Article |
| id | doaj.art-e11bfb5fb1d347e5b0dee2ee09cd4f63 |
| institution | Directory Open Access Journal |
| issn | 0254-5357 |
| language | English |
| last_indexed | 2024-04-10T16:27:25Z |
| publishDate | 2015-05-01 |
| publisher | Science Press, PR China |
| record_format | Article |
| series | Yankuang ceshi |
| spelling | doaj.art-e11bfb5fb1d347e5b0dee2ee09cd4f632023-02-09T01:42:38ZengScience Press, PR ChinaYankuang ceshi0254-53572015-05-0134327828510.15898/j.cnki.11-2131/td.2015.03.003ykcs-34-3-278Characterization of Pore Structures of Jiulaodong Formation Shale in the Sichuan Basin by SEM with Ar-ion MillingWANG Yu0JIN Chan1WANG Li-hua2WANG Jian-qiang3JIANG Zheng4WANG Yan-fei5PU Jie6Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, ChinaKey Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, ChinaKey Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, ChinaKey Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, ChinaKey Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, ChinaInstitute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, ChinaMicroscopic pore structure is the key to studying shale gas reservoirs. Traditional Scanning Electron Microscope cannot be used to identify topographic irregularities caused by differential hardness of components during mechanical polishing. Microscopic pore structures of Jiulaodong formation shale in the Weiyuan area of the Sichuan basin were investigated using scanning electron microscope coupled with an Ar-ion milling technique. Three types of pores were identified: (1) mineral matrix pores (pore diameters are mostly 100-500 nm), mainly including interparticle pores and intraplatelet pores within clay aggregates, and intercrystalline pores within pyrite/anatase and biological pores; (2) organic matter pores (pore diameters range from tens of nanometers to several micrometers), either controlled by thermal evolution of kerogen or clay minerals coated by organic matter; (3) micro fractures (with length of dozens of micrometers and width of a few micrometers), including shrinkage fracture, tectonic fracture, overpressure fracture and artificial fracture. In conclusion, micro-nano pores in Jiulaodong shale are mainly composed of mineral matrix pores and micro fractures which provide the main storage space and flow channel for shale gas.http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.2015.03.003microscopic pore structurear-ion millingscanning electron microscopesichuan basinjiulaodong formation shale |
| spellingShingle | WANG Yu JIN Chan WANG Li-hua WANG Jian-qiang JIANG Zheng WANG Yan-fei PU Jie Characterization of Pore Structures of Jiulaodong Formation Shale in the Sichuan Basin by SEM with Ar-ion Milling Yankuang ceshi microscopic pore structure ar-ion milling scanning electron microscope sichuan basin jiulaodong formation shale |
| title | Characterization of Pore Structures of Jiulaodong Formation Shale in the Sichuan Basin by SEM with Ar-ion Milling |
| title_full | Characterization of Pore Structures of Jiulaodong Formation Shale in the Sichuan Basin by SEM with Ar-ion Milling |
| title_fullStr | Characterization of Pore Structures of Jiulaodong Formation Shale in the Sichuan Basin by SEM with Ar-ion Milling |
| title_full_unstemmed | Characterization of Pore Structures of Jiulaodong Formation Shale in the Sichuan Basin by SEM with Ar-ion Milling |
| title_short | Characterization of Pore Structures of Jiulaodong Formation Shale in the Sichuan Basin by SEM with Ar-ion Milling |
| title_sort | characterization of pore structures of jiulaodong formation shale in the sichuan basin by sem with ar ion milling |
| topic | microscopic pore structure ar-ion milling scanning electron microscope sichuan basin jiulaodong formation shale |
| url | http://www.ykcs.ac.cn/en/article/doi/10.15898/j.cnki.11-2131/td.2015.03.003 |
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