Carbon geosequestration in limestone: Pore-scale dissolution and geomechanical weakening
© 2017 Elsevier Ltd Carbon dioxide geosequestration in deep saline aquifers or oil and gas reservoirs is a key technology to mitigate anthropogenic greenhouse gas emissions. Porous carbonate rock is a potential host rock for CO 2 storage; however, carbonate rock chemically reacts when exposed to the...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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Elsevier
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/58364 |
| _version_ | 1848760240672079872 |
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| author | Lebedev, Maxim Zhang, Y. Sarmadivaleh, Mohammad Barifcani, Ahmed Al-Khdheeawi, E. Iglauer, Stefan |
| author_facet | Lebedev, Maxim Zhang, Y. Sarmadivaleh, Mohammad Barifcani, Ahmed Al-Khdheeawi, E. Iglauer, Stefan |
| author_sort | Lebedev, Maxim |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2017 Elsevier Ltd Carbon dioxide geosequestration in deep saline aquifers or oil and gas reservoirs is a key technology to mitigate anthropogenic greenhouse gas emissions. Porous carbonate rock is a potential host rock for CO 2 storage; however, carbonate rock chemically reacts when exposed to the acidic brine (which is created by the addition of CO 2 , CO 2 -saturated brine). These reactive transport processes are only poorly understood, particularly at the micrometre scale, and importantly how this affects the geomechanical rock properties. We thus imaged a heterogeneous oolitic limestone (Savonnières limestone) core before and after flooding with brine and CO 2 -saturated brine at representative reservoir conditions (323 K temperature, 10 MPa pore pressure, 5 MPa effective stress) in-situ at high resolutions (3.43 µm and 1.25 µm voxel size) in 3D with an x-ray micro-computed tomograph; and measured the changes in nano-scale mechanical properties induced by acid exposure. Indeed the carbonate rock matrix partially dissolved, and absolute and effective porosity and permeability significantly increased. This dissolution was confined to the original flow channels and inlet points. Importantly, the rock matrix weakened significantly (- 47% in indentation modulus) due to the acid exposure. |
| first_indexed | 2025-11-14T10:12:38Z |
| format | Journal Article |
| id | curtin-20.500.11937-58364 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:12:38Z |
| publishDate | 2017 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-583642017-11-24T05:46:19Z Carbon geosequestration in limestone: Pore-scale dissolution and geomechanical weakening Lebedev, Maxim Zhang, Y. Sarmadivaleh, Mohammad Barifcani, Ahmed Al-Khdheeawi, E. Iglauer, Stefan © 2017 Elsevier Ltd Carbon dioxide geosequestration in deep saline aquifers or oil and gas reservoirs is a key technology to mitigate anthropogenic greenhouse gas emissions. Porous carbonate rock is a potential host rock for CO 2 storage; however, carbonate rock chemically reacts when exposed to the acidic brine (which is created by the addition of CO 2 , CO 2 -saturated brine). These reactive transport processes are only poorly understood, particularly at the micrometre scale, and importantly how this affects the geomechanical rock properties. We thus imaged a heterogeneous oolitic limestone (Savonnières limestone) core before and after flooding with brine and CO 2 -saturated brine at representative reservoir conditions (323 K temperature, 10 MPa pore pressure, 5 MPa effective stress) in-situ at high resolutions (3.43 µm and 1.25 µm voxel size) in 3D with an x-ray micro-computed tomograph; and measured the changes in nano-scale mechanical properties induced by acid exposure. Indeed the carbonate rock matrix partially dissolved, and absolute and effective porosity and permeability significantly increased. This dissolution was confined to the original flow channels and inlet points. Importantly, the rock matrix weakened significantly (- 47% in indentation modulus) due to the acid exposure. 2017 Journal Article http://hdl.handle.net/20.500.11937/58364 10.1016/j.ijggc.2017.09.016 Elsevier restricted |
| spellingShingle | Lebedev, Maxim Zhang, Y. Sarmadivaleh, Mohammad Barifcani, Ahmed Al-Khdheeawi, E. Iglauer, Stefan Carbon geosequestration in limestone: Pore-scale dissolution and geomechanical weakening |
| title | Carbon geosequestration in limestone: Pore-scale dissolution and geomechanical weakening |
| title_full | Carbon geosequestration in limestone: Pore-scale dissolution and geomechanical weakening |
| title_fullStr | Carbon geosequestration in limestone: Pore-scale dissolution and geomechanical weakening |
| title_full_unstemmed | Carbon geosequestration in limestone: Pore-scale dissolution and geomechanical weakening |
| title_short | Carbon geosequestration in limestone: Pore-scale dissolution and geomechanical weakening |
| title_sort | carbon geosequestration in limestone: pore-scale dissolution and geomechanical weakening |
| url | http://hdl.handle.net/20.500.11937/58364 |