A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration
Abstract Precipitation or dissolution due to geochemical reactions has been observed in the caprocks for CO2 geosequestration. Geochemical reactions modify the caprock sealing efficiency with self‐limiting or self‐enhancement. However, the effect of this modification on the caprock sealing efficienc...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-06-01
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| Series: | Deep Underground Science and Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/dug2.12040 |
| _version_ | 1797802933031534592 |
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| author | Jianguo Wang Huimin Wang Xiaolin Wang Shengqi Yang Hongtao Wu Chunfai Leung Jiali Tian |
| author_facet | Jianguo Wang Huimin Wang Xiaolin Wang Shengqi Yang Hongtao Wu Chunfai Leung Jiali Tian |
| author_sort | Jianguo Wang |
| collection | DOAJ |
| description | Abstract Precipitation or dissolution due to geochemical reactions has been observed in the caprocks for CO2 geosequestration. Geochemical reactions modify the caprock sealing efficiency with self‐limiting or self‐enhancement. However, the effect of this modification on the caprock sealing efficiency has not been fully investigated through multiphysical‐geochemical coupling analysis. In this study, a multiphysical‐geochemical coupling model was proposed to analyze caprock sealing efficiency. This coupling model considered the full couplings of caprock deformation, two‐phase flow, CO2 concentration diffusion, geochemical reaction, and CO2 sorption. The two‐phase flow only occurs in the fracture network and the CO2 may partially dissolve into water and diffuse through the concentration difference. The dissolved CO2 has geochemical reactions with some critical minerals, thus altering flow channels. The CO2 in the fracture network diffuses into matrix, causing the matrix swelling. This fully coupling model was validated with a penetration experiment on a cement cube and compared with two other models for CO2 storage plumes. Finally, the effects of geochemical reactions on penetration depth and pore pressure were studied through parametric study. The numerical simulations reveal that the coupling of geochemical reactions and matrix diffusion significantly affect the caprock sealing efficiency. Geochemical reactions occur at a short time after the arrival of CO2 concentration and modify the fracture porosity. The CO2 diffusion into the matrix requires a much longer time and mainly induces matrix swelling. These effects may produce self‐enhancement or self‐limiting depending on the flow rate in the fracture network, thus significantly modifying caprock sealing efficiency. |
| first_indexed | 2024-03-13T05:14:17Z |
| format | Article |
| id | doaj.art-8dfcb2ea4b624e47a77af2a5674d48fb |
| institution | Directory Open Access Journal |
| issn | 2097-0668 2770-1328 |
| language | English |
| last_indexed | 2024-03-13T05:14:17Z |
| publishDate | 2023-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Deep Underground Science and Engineering |
| spelling | doaj.art-8dfcb2ea4b624e47a77af2a5674d48fb2023-06-16T01:32:47ZengWileyDeep Underground Science and Engineering2097-06682770-13282023-06-012218820310.1002/dug2.12040A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestrationJianguo Wang0Huimin Wang1Xiaolin Wang2Shengqi Yang3Hongtao Wu4Chunfai Leung5Jiali Tian6School of Mechanics and Civil Engineering China University of Mining and Technology Xuzhou ChinaSchool of Mechanics and Civil Engineering China University of Mining and Technology Xuzhou ChinaSchool of Engineering University of Tasmania Hobart Tasmania AustraliaSchool of Mechanics and Civil Engineering China University of Mining and Technology Xuzhou ChinaCollege of Water Conservancy and Hydropower Engineering Hohai University Nanjing ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology Xuzhou ChinaCollege of Water Conservancy and Hydropower Engineering Hohai University Nanjing ChinaAbstract Precipitation or dissolution due to geochemical reactions has been observed in the caprocks for CO2 geosequestration. Geochemical reactions modify the caprock sealing efficiency with self‐limiting or self‐enhancement. However, the effect of this modification on the caprock sealing efficiency has not been fully investigated through multiphysical‐geochemical coupling analysis. In this study, a multiphysical‐geochemical coupling model was proposed to analyze caprock sealing efficiency. This coupling model considered the full couplings of caprock deformation, two‐phase flow, CO2 concentration diffusion, geochemical reaction, and CO2 sorption. The two‐phase flow only occurs in the fracture network and the CO2 may partially dissolve into water and diffuse through the concentration difference. The dissolved CO2 has geochemical reactions with some critical minerals, thus altering flow channels. The CO2 in the fracture network diffuses into matrix, causing the matrix swelling. This fully coupling model was validated with a penetration experiment on a cement cube and compared with two other models for CO2 storage plumes. Finally, the effects of geochemical reactions on penetration depth and pore pressure were studied through parametric study. The numerical simulations reveal that the coupling of geochemical reactions and matrix diffusion significantly affect the caprock sealing efficiency. Geochemical reactions occur at a short time after the arrival of CO2 concentration and modify the fracture porosity. The CO2 diffusion into the matrix requires a much longer time and mainly induces matrix swelling. These effects may produce self‐enhancement or self‐limiting depending on the flow rate in the fracture network, thus significantly modifying caprock sealing efficiency.https://doi.org/10.1002/dug2.12040caprock sealing efficiencyCO2 diffusionCO2 geosequestrationgeochemical reactionsorption strain |
| spellingShingle | Jianguo Wang Huimin Wang Xiaolin Wang Shengqi Yang Hongtao Wu Chunfai Leung Jiali Tian A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration Deep Underground Science and Engineering caprock sealing efficiency CO2 diffusion CO2 geosequestration geochemical reaction sorption strain |
| title | A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration |
| title_full | A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration |
| title_fullStr | A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration |
| title_full_unstemmed | A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration |
| title_short | A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration |
| title_sort | multiphysical geochemical coupling model for caprock sealing efficiency in co2 geosequestration |
| topic | caprock sealing efficiency CO2 diffusion CO2 geosequestration geochemical reaction sorption strain |
| url | https://doi.org/10.1002/dug2.12040 |
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