Study on the Formation Mechanism of Shale Roof, Floor Sealing, and Shale Self-Sealing: A Case of Member I of the Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation in the Yangtze Region
Similar to North America, China has abundant shale resources. Significant progress has been made in the exploration and exploitation of shale gas in China since 2009. As the geological theory of unconventional oil and gas was proposed, scientists have started researching conditions for shale gas pre...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2021-12-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2021.764287/full |
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| author | Ziya Zhang Ziya Zhang Ziya Zhang Kun Zhang Kun Zhang Kun Zhang Kun Zhang Yan Song Yan Song Zhenxue Jiang Zhenxue Jiang Shu Jiang Shu Jiang Pengfei Wang Yong Li Xiangdong Yin Xiangdong Yin Xiangdong Yin Zhiyuan Chen Zhengwei Li Xuejiao Yuan Xuejiao Yuan Pei Liu Pei Liu Fengli Han Fengli Han Liangyi Tang Liangyi Tang Yiming Yang Yiming Yang Yao Zeng Yao Zeng |
| author_facet | Ziya Zhang Ziya Zhang Ziya Zhang Kun Zhang Kun Zhang Kun Zhang Kun Zhang Yan Song Yan Song Zhenxue Jiang Zhenxue Jiang Shu Jiang Shu Jiang Pengfei Wang Yong Li Xiangdong Yin Xiangdong Yin Xiangdong Yin Zhiyuan Chen Zhengwei Li Xuejiao Yuan Xuejiao Yuan Pei Liu Pei Liu Fengli Han Fengli Han Liangyi Tang Liangyi Tang Yiming Yang Yiming Yang Yao Zeng Yao Zeng |
| author_sort | Ziya Zhang |
| collection | DOAJ |
| description | Similar to North America, China has abundant shale resources. Significant progress has been made in the exploration and exploitation of shale gas in China since 2009. As the geological theory of unconventional oil and gas was proposed, scientists have started researching conditions for shale gas preservation. The shale roof and floor sealing and the shale self-sealing are the critical objects of such research, which, however, are still in the initial stage. This article studies the formation mechanism of shale roof and floor sealing and shale self-sealing by taking marine shales from Member I of the upper Ordovician Wufeng Formation–lower Longmaxi Formation in the upper Yangtze region as the research object. Analyses were performed on the TOC content, mineral composition, and porosity, as well as the FIB-SEM, FIB-HIM, and gas permeability experiments on the core samples collected from the marine shales mentioned above. The conclusions are as follows: for the sealings of shale roof and floor, the regional cap rocks, roof, and floor provide sealing for shales due to physical property differences. For the self-sealing of shales, the second and third sub-members of Member I of the Wufeng Formation–Longmaxi Formation mainly develop clay mineral pores which are dominated by macropores with poor connectivity, while the first sub-member of Member I of the Wufeng Formation–Longmaxi Formation mainly develops organic-matter pores, which are dominated by micropores and mesopores with good connectivity. Owing to the connectivity difference, the second and third sub-members provide sealing for the first sub-member, while the methane adsorption effect of shales can inhibit large-scale shale gas migration as it decreases the gas permeability; thus, the organic-rich shales from the first sub-member of Member I of the Wufeng Formation–Longmaxi Formation provides sealing for itself. |
| first_indexed | 2024-12-24T11:15:56Z |
| format | Article |
| id | doaj.art-b466fd763a1648f4b3178c875de8cd69 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-24T11:15:56Z |
| publishDate | 2021-12-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Earth Science |
| spelling | doaj.art-b466fd763a1648f4b3178c875de8cd692022-12-21T16:58:23ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632021-12-01910.3389/feart.2021.764287764287Study on the Formation Mechanism of Shale Roof, Floor Sealing, and Shale Self-Sealing: A Case of Member I of the Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation in the Yangtze RegionZiya Zhang0Ziya Zhang1Ziya Zhang2Kun Zhang3Kun Zhang4Kun Zhang5Kun Zhang6Yan Song7Yan Song8Zhenxue Jiang9Zhenxue Jiang10Shu Jiang11Shu Jiang12Pengfei Wang13Yong Li14Xiangdong Yin15Xiangdong Yin16Xiangdong Yin17Zhiyuan Chen18Zhengwei Li19Xuejiao Yuan20Xuejiao Yuan21Pei Liu22Pei Liu23Fengli Han24Fengli Han25Liangyi Tang26Liangyi Tang27Yiming Yang28Yiming Yang29Yao Zeng30Yao Zeng31State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, ChinaUnconventional Petroleum Research Institute, China University of Petroleum, Beijing, ChinaChinese Academy of Geological Sciences, Beijing, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaKey Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan, ChinaEnergy and Geoscience Institute, University of Utah, Salt Lake City, UT, United StatesState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, ChinaUnconventional Petroleum Research Institute, China University of Petroleum, Beijing, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, ChinaUnconventional Petroleum Research Institute, China University of Petroleum, Beijing, ChinaKey Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan, ChinaEnergy and Geoscience Institute, University of Utah, Salt Lake City, UT, United StatesGeoscience Documentation Center, China Geological Survey, Beijing, ChinaResearch Institute of Petroleum Exploration and Development, PetroChina Southwest Oilfield Company, Chengdu, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, China0CNPC Managers Training Institute, Beijing, China1School of Environment and Resource, Southwest University of Science and Technology, Mianyang, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaSchool of Geoscience and Technology, Southwest Petroleum University, Chengdu, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, ChinaSimilar to North America, China has abundant shale resources. Significant progress has been made in the exploration and exploitation of shale gas in China since 2009. As the geological theory of unconventional oil and gas was proposed, scientists have started researching conditions for shale gas preservation. The shale roof and floor sealing and the shale self-sealing are the critical objects of such research, which, however, are still in the initial stage. This article studies the formation mechanism of shale roof and floor sealing and shale self-sealing by taking marine shales from Member I of the upper Ordovician Wufeng Formation–lower Longmaxi Formation in the upper Yangtze region as the research object. Analyses were performed on the TOC content, mineral composition, and porosity, as well as the FIB-SEM, FIB-HIM, and gas permeability experiments on the core samples collected from the marine shales mentioned above. The conclusions are as follows: for the sealings of shale roof and floor, the regional cap rocks, roof, and floor provide sealing for shales due to physical property differences. For the self-sealing of shales, the second and third sub-members of Member I of the Wufeng Formation–Longmaxi Formation mainly develop clay mineral pores which are dominated by macropores with poor connectivity, while the first sub-member of Member I of the Wufeng Formation–Longmaxi Formation mainly develops organic-matter pores, which are dominated by micropores and mesopores with good connectivity. Owing to the connectivity difference, the second and third sub-members provide sealing for the first sub-member, while the methane adsorption effect of shales can inhibit large-scale shale gas migration as it decreases the gas permeability; thus, the organic-rich shales from the first sub-member of Member I of the Wufeng Formation–Longmaxi Formation provides sealing for itself.https://www.frontiersin.org/articles/10.3389/feart.2021.764287/fullmarine shaleroof and floor sealingself-sealingorganic-matter poresadsorption capacity |
| spellingShingle | Ziya Zhang Ziya Zhang Ziya Zhang Kun Zhang Kun Zhang Kun Zhang Kun Zhang Yan Song Yan Song Zhenxue Jiang Zhenxue Jiang Shu Jiang Shu Jiang Pengfei Wang Yong Li Xiangdong Yin Xiangdong Yin Xiangdong Yin Zhiyuan Chen Zhengwei Li Xuejiao Yuan Xuejiao Yuan Pei Liu Pei Liu Fengli Han Fengli Han Liangyi Tang Liangyi Tang Yiming Yang Yiming Yang Yao Zeng Yao Zeng Study on the Formation Mechanism of Shale Roof, Floor Sealing, and Shale Self-Sealing: A Case of Member I of the Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation in the Yangtze Region Frontiers in Earth Science marine shale roof and floor sealing self-sealing organic-matter pores adsorption capacity |
| title | Study on the Formation Mechanism of Shale Roof, Floor Sealing, and Shale Self-Sealing: A Case of Member I of the Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation in the Yangtze Region |
| title_full | Study on the Formation Mechanism of Shale Roof, Floor Sealing, and Shale Self-Sealing: A Case of Member I of the Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation in the Yangtze Region |
| title_fullStr | Study on the Formation Mechanism of Shale Roof, Floor Sealing, and Shale Self-Sealing: A Case of Member I of the Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation in the Yangtze Region |
| title_full_unstemmed | Study on the Formation Mechanism of Shale Roof, Floor Sealing, and Shale Self-Sealing: A Case of Member I of the Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation in the Yangtze Region |
| title_short | Study on the Formation Mechanism of Shale Roof, Floor Sealing, and Shale Self-Sealing: A Case of Member I of the Upper Ordovician Wufeng Formation–Lower Silurian Longmaxi Formation in the Yangtze Region |
| title_sort | study on the formation mechanism of shale roof floor sealing and shale self sealing a case of member i of the upper ordovician wufeng formation lower silurian longmaxi formation in the yangtze region |
| topic | marine shale roof and floor sealing self-sealing organic-matter pores adsorption capacity |
| url | https://www.frontiersin.org/articles/10.3389/feart.2021.764287/full |
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