Structural trapping capacity of oil-wet caprock as a function of pressure, temperature and salinity
Wettability is a major parameter which significantly influences structural trapping capacities in CO2 geo-sequestration. In this context, the original wettability state of a caprock is of key importance, however, less attention has been given towards this aspect in the past. We thus evaluated the im...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
Elsevier
2016
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| Online Access: | http://hdl.handle.net/20.500.11937/11480 |
| _version_ | 1848747817327132672 |
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| author | Arif, M. Barifcani, Ahmed Lebedev, Maxim Iglauer, S. |
| author_facet | Arif, M. Barifcani, Ahmed Lebedev, Maxim Iglauer, S. |
| author_sort | Arif, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Wettability is a major parameter which significantly influences structural trapping capacities in CO2 geo-sequestration. In this context, the original wettability state of a caprock is of key importance, however, less attention has been given towards this aspect in the past. We thus evaluated the impact of caprock oil-wettability on storage potential; we used five mica substrates as representatives of caprock and modified their initial wettability to obtain different oil-wetness (0–118° water contact angle at ambient conditions), so that we were able to conduct a systematic study. Advancing and receding contact angles (θa and θr) were measured on all surfaces for wide ranges of pressure (0.1 MPa–20 MPa), temperature (308 K, 323 K and 343 K) and salinity (0 wt%–20 wt% NaCl). The results indicate that advancing and receding contact angles increase with pressure (when pressure increased from 0.1 MPa to 20 MPa at 343 K, θa increased from 0° to 67° for water-wet substrate and from 73° to 156° for oil-wet substrate), and salinity but decrease with temperature. Finally we predict CO2 column heights, which can be permanently stored beneath oil-wet caprocks. Clearly, the structural trapping capacity is significantly reduced in case of oil-wet caprock (when compared to water-wet caprock). We conclude that it is essential to evaluate CO2-wettability of caprocks to determine safe limits of operation for containment security. |
| first_indexed | 2025-11-14T06:55:10Z |
| format | Journal Article |
| id | curtin-20.500.11937-11480 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:55:10Z |
| publishDate | 2016 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-114802017-09-13T14:56:50Z Structural trapping capacity of oil-wet caprock as a function of pressure, temperature and salinity Arif, M. Barifcani, Ahmed Lebedev, Maxim Iglauer, S. Wettability is a major parameter which significantly influences structural trapping capacities in CO2 geo-sequestration. In this context, the original wettability state of a caprock is of key importance, however, less attention has been given towards this aspect in the past. We thus evaluated the impact of caprock oil-wettability on storage potential; we used five mica substrates as representatives of caprock and modified their initial wettability to obtain different oil-wetness (0–118° water contact angle at ambient conditions), so that we were able to conduct a systematic study. Advancing and receding contact angles (θa and θr) were measured on all surfaces for wide ranges of pressure (0.1 MPa–20 MPa), temperature (308 K, 323 K and 343 K) and salinity (0 wt%–20 wt% NaCl). The results indicate that advancing and receding contact angles increase with pressure (when pressure increased from 0.1 MPa to 20 MPa at 343 K, θa increased from 0° to 67° for water-wet substrate and from 73° to 156° for oil-wet substrate), and salinity but decrease with temperature. Finally we predict CO2 column heights, which can be permanently stored beneath oil-wet caprocks. Clearly, the structural trapping capacity is significantly reduced in case of oil-wet caprock (when compared to water-wet caprock). We conclude that it is essential to evaluate CO2-wettability of caprocks to determine safe limits of operation for containment security. 2016 Journal Article http://hdl.handle.net/20.500.11937/11480 10.1016/j.ijggc.2016.04.024 Elsevier restricted |
| spellingShingle | Arif, M. Barifcani, Ahmed Lebedev, Maxim Iglauer, S. Structural trapping capacity of oil-wet caprock as a function of pressure, temperature and salinity |
| title | Structural trapping capacity of oil-wet caprock as a function of pressure, temperature and salinity |
| title_full | Structural trapping capacity of oil-wet caprock as a function of pressure, temperature and salinity |
| title_fullStr | Structural trapping capacity of oil-wet caprock as a function of pressure, temperature and salinity |
| title_full_unstemmed | Structural trapping capacity of oil-wet caprock as a function of pressure, temperature and salinity |
| title_short | Structural trapping capacity of oil-wet caprock as a function of pressure, temperature and salinity |
| title_sort | structural trapping capacity of oil-wet caprock as a function of pressure, temperature and salinity |
| url | http://hdl.handle.net/20.500.11937/11480 |