Spatial Reconstruction of Pore‐Crack Microstructure and Its Topological Configuration Relationship With Connectivity and Pore‐Scale Flow in Coal by 3D‐XRM
ABSTRACT In consideration of the significance of connectivity features and topological relationships within the pore‐crack network, the micro‐scale pore‐crack microstructure of intact and tectonic coals from Qinan was investigated in 3D spatial visualization using digital core technology. The result...
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Wiley
2025-06-01
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| Series: | Energy Science & Engineering |
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| Online Access: | https://doi.org/10.1002/ese3.70084 |
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| author | Congmeng Hao Haoyu Zhang Xuepeng Zhang Ruxiang Ma Kaizhong Zhang Xiangqian Xing |
| author_facet | Congmeng Hao Haoyu Zhang Xuepeng Zhang Ruxiang Ma Kaizhong Zhang Xiangqian Xing |
| author_sort | Congmeng Hao |
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| description | ABSTRACT In consideration of the significance of connectivity features and topological relationships within the pore‐crack network, the micro‐scale pore‐crack microstructure of intact and tectonic coals from Qinan was investigated in 3D spatial visualization using digital core technology. The results indicate that the roughly vertical distribution in intact coal microstructure regularly divides the coal matrix into several cubic blocks. Tectonism is responsible for the fundamental transformation of the microstructure, causing tectonic coals to exhibit more sporadically distributed microcracks and pore clusters. The topological sphere and stick model based on skeletonization and its quantitative connectivity parameters show that the throat lengths of Qinan coals are mainly 0–150 μm, with tectonic coals having fewer throats over 100 μm. Pore diameters in intact coals are mostly under 30 μm, while tectonic coals exceed 20 μm. Compared with intact coals, pore spaces under 2000 μm³ in tectonic coals increased from 61.38% to 71.13%, surface area increased from 69.98% to 77.76%, and coordination number also increased significantly. These quantitative parameters collectively indicate that tectonic factors promoted the formation of more minute‐scale pore spaces and significantly enhanced the connectivity between pore spaces and throats. On this basis, the pore‐scale flow simulations were carried out from the equivalent pore network model, indicating that the pressure distribution of tectonic coals in different directions could be more concentrated and uniform than intact coals with lower fluid pressure values, revealing the promotion of tectonic effects on pore‐scale fluid transport. |
| format | Article |
| id | doaj-art-067f566ccd38494792f4e59a74054cd9 |
| institution | OA Journals |
| issn | 2050-0505 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Wiley |
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| series | Energy Science & Engineering |
| spelling | doaj-art-067f566ccd38494792f4e59a74054cd92025-08-20T02:09:00ZengWileyEnergy Science & Engineering2050-05052025-06-011363031304410.1002/ese3.70084Spatial Reconstruction of Pore‐Crack Microstructure and Its Topological Configuration Relationship With Connectivity and Pore‐Scale Flow in Coal by 3D‐XRMCongmeng Hao0Haoyu Zhang1Xuepeng Zhang2Ruxiang Ma3Kaizhong Zhang4Xiangqian Xing5China Academy of Safety Science and Technology Beijing ChinaSchool of Safety Engineering China University of Mining and Technology Xuzhou ChinaShandong Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and Technology Qingdao ChinaShandong Engineering Research Center of Mine Gas Disaster Control Qingdao ChinaNational and Local Joint Engineering Laboratory of Internet Application Technology on Mine China University of Mining and Technology ChinaSchool of Safety Engineering China University of Mining and Technology Xuzhou ChinaABSTRACT In consideration of the significance of connectivity features and topological relationships within the pore‐crack network, the micro‐scale pore‐crack microstructure of intact and tectonic coals from Qinan was investigated in 3D spatial visualization using digital core technology. The results indicate that the roughly vertical distribution in intact coal microstructure regularly divides the coal matrix into several cubic blocks. Tectonism is responsible for the fundamental transformation of the microstructure, causing tectonic coals to exhibit more sporadically distributed microcracks and pore clusters. The topological sphere and stick model based on skeletonization and its quantitative connectivity parameters show that the throat lengths of Qinan coals are mainly 0–150 μm, with tectonic coals having fewer throats over 100 μm. Pore diameters in intact coals are mostly under 30 μm, while tectonic coals exceed 20 μm. Compared with intact coals, pore spaces under 2000 μm³ in tectonic coals increased from 61.38% to 71.13%, surface area increased from 69.98% to 77.76%, and coordination number also increased significantly. These quantitative parameters collectively indicate that tectonic factors promoted the formation of more minute‐scale pore spaces and significantly enhanced the connectivity between pore spaces and throats. On this basis, the pore‐scale flow simulations were carried out from the equivalent pore network model, indicating that the pressure distribution of tectonic coals in different directions could be more concentrated and uniform than intact coals with lower fluid pressure values, revealing the promotion of tectonic effects on pore‐scale fluid transport.https://doi.org/10.1002/ese3.700843D spatial visualizationpore microstructuretectonic coaltopological connectivity |
| spellingShingle | Congmeng Hao Haoyu Zhang Xuepeng Zhang Ruxiang Ma Kaizhong Zhang Xiangqian Xing Spatial Reconstruction of Pore‐Crack Microstructure and Its Topological Configuration Relationship With Connectivity and Pore‐Scale Flow in Coal by 3D‐XRM Energy Science & Engineering 3D spatial visualization pore microstructure tectonic coal topological connectivity |
| title | Spatial Reconstruction of Pore‐Crack Microstructure and Its Topological Configuration Relationship With Connectivity and Pore‐Scale Flow in Coal by 3D‐XRM |
| title_full | Spatial Reconstruction of Pore‐Crack Microstructure and Its Topological Configuration Relationship With Connectivity and Pore‐Scale Flow in Coal by 3D‐XRM |
| title_fullStr | Spatial Reconstruction of Pore‐Crack Microstructure and Its Topological Configuration Relationship With Connectivity and Pore‐Scale Flow in Coal by 3D‐XRM |
| title_full_unstemmed | Spatial Reconstruction of Pore‐Crack Microstructure and Its Topological Configuration Relationship With Connectivity and Pore‐Scale Flow in Coal by 3D‐XRM |
| title_short | Spatial Reconstruction of Pore‐Crack Microstructure and Its Topological Configuration Relationship With Connectivity and Pore‐Scale Flow in Coal by 3D‐XRM |
| title_sort | spatial reconstruction of pore crack microstructure and its topological configuration relationship with connectivity and pore scale flow in coal by 3d xrm |
| topic | 3D spatial visualization pore microstructure tectonic coal topological connectivity |
| url | https://doi.org/10.1002/ese3.70084 |
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