Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress
Gas permeability (k) and porosity (f) are the most important parameters in CBM/ECBM and CCS in deep unmineable coal seams. k and f depend on the coal microstructure, and k and f significantly change with varying effective stress. However, how the coal microstructure is related to such permeability a...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Published: |
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/17959 |
| _version_ | 1848749607947862016 |
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| author | Zhang, Yihuai Xu, X. Lebedev, Maxim Sarmadivaleh, Mohammad Barifcani, Ahmed Iglauer, Stefan |
| author_facet | Zhang, Yihuai Xu, X. Lebedev, Maxim Sarmadivaleh, Mohammad Barifcani, Ahmed Iglauer, Stefan |
| author_sort | Zhang, Yihuai |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Gas permeability (k) and porosity (f) are the most important parameters in CBM/ECBM and CCS in deep unmineable coal seams. k and f depend on the coal microstructure, and k and f significantly change with varying effective stress. However, how the coal microstructure is related to such permeability and porosity changes is only poorly understood. We thus imaged sub-bituminous coal samples at two resolutions (medium - 33.7 µm and high - 3.43 µm voxel size) in 3D with an x-ray micro-computed tomography as a function of applied effective stress; and investigated how cleat morphology, k and f are influenced by the changes in effective stress and how these parameters are interrelated. In the images, three phases were identified: microcleats (void), a mineral phase (carbonate) and the coal matrix. When effective stress increased, the cleats became narrow and closed or disconnected. This resulted in a dramatic permeability drop with increasing effective stress, while porosity decreased only linearly. |
| first_indexed | 2025-11-14T07:23:38Z |
| format | Journal Article |
| id | curtin-20.500.11937-17959 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:23:38Z |
| publishDate | 2016 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-179592018-09-04T01:45:38Z Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress Zhang, Yihuai Xu, X. Lebedev, Maxim Sarmadivaleh, Mohammad Barifcani, Ahmed Iglauer, Stefan Gas permeability (k) and porosity (f) are the most important parameters in CBM/ECBM and CCS in deep unmineable coal seams. k and f depend on the coal microstructure, and k and f significantly change with varying effective stress. However, how the coal microstructure is related to such permeability and porosity changes is only poorly understood. We thus imaged sub-bituminous coal samples at two resolutions (medium - 33.7 µm and high - 3.43 µm voxel size) in 3D with an x-ray micro-computed tomography as a function of applied effective stress; and investigated how cleat morphology, k and f are influenced by the changes in effective stress and how these parameters are interrelated. In the images, three phases were identified: microcleats (void), a mineral phase (carbonate) and the coal matrix. When effective stress increased, the cleats became narrow and closed or disconnected. This resulted in a dramatic permeability drop with increasing effective stress, while porosity decreased only linearly. 2016 Journal Article http://hdl.handle.net/20.500.11937/17959 10.1016/j.coal.2016.08.016 fulltext |
| spellingShingle | Zhang, Yihuai Xu, X. Lebedev, Maxim Sarmadivaleh, Mohammad Barifcani, Ahmed Iglauer, Stefan Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress |
| title | Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress |
| title_full | Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress |
| title_fullStr | Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress |
| title_full_unstemmed | Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress |
| title_short | Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress |
| title_sort | multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress |
| url | http://hdl.handle.net/20.500.11937/17959 |