A Comparative Study of the Micropore Structure between the Transitional and Marine Shales in China
To compare the micropore structure of marine-continental transitional shale with marine shale, organic geochemical, field emission scanning electron microscopy, and low-temperature nitrogen adsorption experiments were conducted on shale samples from the Shanxi Formation in the eastern Ordos Basin an...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/5562532 |
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| author | Pengfei Jiao Genshun Yao Shangwen Zhou Zhe Yu Shiluo Wang |
| author_facet | Pengfei Jiao Genshun Yao Shangwen Zhou Zhe Yu Shiluo Wang |
| author_sort | Pengfei Jiao |
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| description | To compare the micropore structure of marine-continental transitional shale with marine shale, organic geochemical, field emission scanning electron microscopy, and low-temperature nitrogen adsorption experiments were conducted on shale samples from the Shanxi Formation in the eastern Ordos Basin and the Longmaxi Formation in the southern Sichuan Basin. The results show that Shanxi Formation shale has a smaller specific surface area and pore volume than Longmaxi Formation shale; therefore, the transitional shales fail to provide sufficient pore spaces for the effective storage and preservation of natural gas. Both the transitional and marine shales are in an overmature stage with high total organic carbon content, but they differ considerably in pore types and development degrees. Inorganic pores and fractures are dominantly developed in transitional shales, such as intragranular pores and clay mineral interlayer fractures, while organic nanopores are rarely developed. In contrast, organic pores are the dominant pore type in the marine shales and inorganic pores are rarely observed. The fractal analysis also shows that pore structure complexity and heterogeneity are quite different. These differences were related to different organic types, i.e., type I of marine shale and type III of transitional shale. Marine Longmaxi shale has experienced liquid hydrocarbon cracking, gas generation, and pore-forming processes, providing good conditions for natural gas to be preserved. However, during the evolution of transitional Shanxi shale, gas cannot be effectively preserved due to the lack of the above evolution processes, leading to the poor gas-bearing property. The detailed comparison of the micropore structure between the transitional and marine shales is of great importance for the future exploitation of marine-continental transitional shale gas in China. |
| format | Article |
| id | doaj-art-d5872ad0dc59415a9cc00588dabe403d |
| institution | OA Journals |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
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| series | Geofluids |
| spelling | doaj-art-d5872ad0dc59415a9cc00588dabe403d2025-08-20T02:19:40ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/55625325562532A Comparative Study of the Micropore Structure between the Transitional and Marine Shales in ChinaPengfei Jiao0Genshun Yao1Shangwen Zhou2Zhe Yu3Shiluo Wang4PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaPetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, ChinaTo compare the micropore structure of marine-continental transitional shale with marine shale, organic geochemical, field emission scanning electron microscopy, and low-temperature nitrogen adsorption experiments were conducted on shale samples from the Shanxi Formation in the eastern Ordos Basin and the Longmaxi Formation in the southern Sichuan Basin. The results show that Shanxi Formation shale has a smaller specific surface area and pore volume than Longmaxi Formation shale; therefore, the transitional shales fail to provide sufficient pore spaces for the effective storage and preservation of natural gas. Both the transitional and marine shales are in an overmature stage with high total organic carbon content, but they differ considerably in pore types and development degrees. Inorganic pores and fractures are dominantly developed in transitional shales, such as intragranular pores and clay mineral interlayer fractures, while organic nanopores are rarely developed. In contrast, organic pores are the dominant pore type in the marine shales and inorganic pores are rarely observed. The fractal analysis also shows that pore structure complexity and heterogeneity are quite different. These differences were related to different organic types, i.e., type I of marine shale and type III of transitional shale. Marine Longmaxi shale has experienced liquid hydrocarbon cracking, gas generation, and pore-forming processes, providing good conditions for natural gas to be preserved. However, during the evolution of transitional Shanxi shale, gas cannot be effectively preserved due to the lack of the above evolution processes, leading to the poor gas-bearing property. The detailed comparison of the micropore structure between the transitional and marine shales is of great importance for the future exploitation of marine-continental transitional shale gas in China.http://dx.doi.org/10.1155/2021/5562532 |
| spellingShingle | Pengfei Jiao Genshun Yao Shangwen Zhou Zhe Yu Shiluo Wang A Comparative Study of the Micropore Structure between the Transitional and Marine Shales in China Geofluids |
| title | A Comparative Study of the Micropore Structure between the Transitional and Marine Shales in China |
| title_full | A Comparative Study of the Micropore Structure between the Transitional and Marine Shales in China |
| title_fullStr | A Comparative Study of the Micropore Structure between the Transitional and Marine Shales in China |
| title_full_unstemmed | A Comparative Study of the Micropore Structure between the Transitional and Marine Shales in China |
| title_short | A Comparative Study of the Micropore Structure between the Transitional and Marine Shales in China |
| title_sort | comparative study of the micropore structure between the transitional and marine shales in china |
| url | http://dx.doi.org/10.1155/2021/5562532 |
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