Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress
dc.contributor.author | Zhang, Yihuai | |
dc.contributor.author | Xu, X. | |
dc.contributor.author | Lebedev, Maxim | |
dc.contributor.author | Sarmadivaleh, Mohammad | |
dc.contributor.author | Barifcani, Ahmed | |
dc.contributor.author | Iglauer, Stefan | |
dc.date.accessioned | 2017-01-30T12:05:11Z | |
dc.date.available | 2017-01-30T12:05:11Z | |
dc.date.created | 2016-09-08T19:30:28Z | |
dc.date.issued | 2016 | |
dc.identifier.citation | Zhang, Y. and Xu, X. and Lebedev, M. and Sarmadivaleh, M. and Barifcani, A. and Iglauer, S. 2016. Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress. International Journal of Coal Geology. 165: pp. 149-156. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/17959 | |
dc.identifier.doi | 10.1016/j.coal.2016.08.016 | |
dc.description.abstract |
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. | |
dc.title | Multi-scale x-ray computed tomography analysis of coal microstructure and permeability changes as a function of effective stress | |
dc.type | Journal Article | |
dcterms.source.volume | 165 | |
dcterms.source.startPage | 149 | |
dcterms.source.endPage | 156 | |
dcterms.source.issn | 0166-5162 | |
dcterms.source.title | International Journal of Coal Geology | |
curtin.department | Department of Exploration Geophysics | |
curtin.accessStatus | Open access |