Study on coalbed methane flow characteristics based on fractal bifurcation fracture network model
The geometric structure and distribution of the fracture network significantly impact the coalbed methane flow characteristics. The indoor optical microscope test is utilized to analyze the distribution and structural characteristics of natural fractures in coal. The results indicate that the fractu...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-01-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.1108786/full |
| _version_ | 1797956531149340672 |
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| author | Shuzhen Jiang Shuzhen Jiang Shuzhen Jiang Binwei Xia Binwei Xia Binwei Xia Jiansong Peng Jiansong Peng Jiansong Peng Tai Zeng Tai Zeng Tai Zeng |
| author_facet | Shuzhen Jiang Shuzhen Jiang Shuzhen Jiang Binwei Xia Binwei Xia Binwei Xia Jiansong Peng Jiansong Peng Jiansong Peng Tai Zeng Tai Zeng Tai Zeng |
| author_sort | Shuzhen Jiang |
| collection | DOAJ |
| description | The geometric structure and distribution of the fracture network significantly impact the coalbed methane flow characteristics. The indoor optical microscope test is utilized to analyze the distribution and structural characteristics of natural fractures in coal. The results indicate that the fracture network in coal consists primarily of irregular bifurcated fractures, but the influence of the bifurcation fracture network’s structural characteristics on permeability remains unclear. Therefore, the fracture network geometric structure characteristic parameters are considered in accordance with the fractal theory, and the analytical formula of the bifurcation fracture network permeability is established. Meanwhile, the bifurcation fracture network geometric model with varied structural parameters is reconstructed using the pixel probability decomposition algorithm. Finally, the influence of the key parameters of the reconstructed bifurcation fracture network on the coal seam permeability is analyzed through numerical simulation. The results indicate that the permeability of the bifurcated fracture network increases with the increase of fracture porosity φf, aperture ratio χ, and proportionality coefficient η, and decreases with the increase of tortuosity fractal dimension DT, bifurcation angle θ, fractal dimension Df, and bifurcation level n. Among them, fracture porosity and proportionality coefficient have the greatest influence on permeability, followed by tortuosity fractal dimension, aperture ratio. |
| first_indexed | 2024-04-10T23:51:27Z |
| format | Article |
| id | doaj.art-8585d4cafc844671a60d1d87054bf016 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-10T23:51:27Z |
| publishDate | 2023-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-8585d4cafc844671a60d1d87054bf0162023-01-10T18:42:36ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-01-011010.3389/feart.2022.11087861108786Study on coalbed methane flow characteristics based on fractal bifurcation fracture network modelShuzhen Jiang0Shuzhen Jiang1Shuzhen Jiang2Binwei Xia3Binwei Xia4Binwei Xia5Jiansong Peng6Jiansong Peng7Jiansong Peng8Tai Zeng9Tai Zeng10Tai Zeng11State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, ChinaNational and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing, ChinaSchool of Resources and Safety Engineering, Chongqing University, Chongqing, ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, ChinaNational and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing, ChinaSchool of Resources and Safety Engineering, Chongqing University, Chongqing, ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, ChinaNational and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing, ChinaSchool of Resources and Safety Engineering, Chongqing University, Chongqing, ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, ChinaNational and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing, ChinaSchool of Resources and Safety Engineering, Chongqing University, Chongqing, ChinaThe geometric structure and distribution of the fracture network significantly impact the coalbed methane flow characteristics. The indoor optical microscope test is utilized to analyze the distribution and structural characteristics of natural fractures in coal. The results indicate that the fracture network in coal consists primarily of irregular bifurcated fractures, but the influence of the bifurcation fracture network’s structural characteristics on permeability remains unclear. Therefore, the fracture network geometric structure characteristic parameters are considered in accordance with the fractal theory, and the analytical formula of the bifurcation fracture network permeability is established. Meanwhile, the bifurcation fracture network geometric model with varied structural parameters is reconstructed using the pixel probability decomposition algorithm. Finally, the influence of the key parameters of the reconstructed bifurcation fracture network on the coal seam permeability is analyzed through numerical simulation. The results indicate that the permeability of the bifurcated fracture network increases with the increase of fracture porosity φf, aperture ratio χ, and proportionality coefficient η, and decreases with the increase of tortuosity fractal dimension DT, bifurcation angle θ, fractal dimension Df, and bifurcation level n. Among them, fracture porosity and proportionality coefficient have the greatest influence on permeability, followed by tortuosity fractal dimension, aperture ratio.https://www.frontiersin.org/articles/10.3389/feart.2022.1108786/fullfractal geometrypermeability modelbifurcation fracturestructural characteristiccoalbed methane |
| spellingShingle | Shuzhen Jiang Shuzhen Jiang Shuzhen Jiang Binwei Xia Binwei Xia Binwei Xia Jiansong Peng Jiansong Peng Jiansong Peng Tai Zeng Tai Zeng Tai Zeng Study on coalbed methane flow characteristics based on fractal bifurcation fracture network model Frontiers in Earth Science fractal geometry permeability model bifurcation fracture structural characteristic coalbed methane |
| title | Study on coalbed methane flow characteristics based on fractal bifurcation fracture network model |
| title_full | Study on coalbed methane flow characteristics based on fractal bifurcation fracture network model |
| title_fullStr | Study on coalbed methane flow characteristics based on fractal bifurcation fracture network model |
| title_full_unstemmed | Study on coalbed methane flow characteristics based on fractal bifurcation fracture network model |
| title_short | Study on coalbed methane flow characteristics based on fractal bifurcation fracture network model |
| title_sort | study on coalbed methane flow characteristics based on fractal bifurcation fracture network model |
| topic | fractal geometry permeability model bifurcation fracture structural characteristic coalbed methane |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.1108786/full |
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