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A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration
https://orcid.org/0000-0003-2988-7867
AbstractPrecipitation 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.
Highlights A fully multiphysical‐geochemical coupling model is proposed for caprock sealing efficiency. Two‐phase flow, caprock deformation, gaseous CO2 diffusion into matrix and sorption, dissolved CO2 diffusion in water and geochemical reaction are included. Caprock sealing mechanisms with precipitation or dissolution and flow rate are explored. Effects of carbonation and sorption swelling on penetration depth are compared.
A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration
https://orcid.org/0000-0003-2988-7867
AbstractPrecipitation 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.
Highlights A fully multiphysical‐geochemical coupling model is proposed for caprock sealing efficiency. Two‐phase flow, caprock deformation, gaseous CO2 diffusion into matrix and sorption, dissolved CO2 diffusion in water and geochemical reaction are included. Caprock sealing mechanisms with precipitation or dissolution and flow rate are explored. Effects of carbonation and sorption swelling on penetration depth are compared.
A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration
https://orcid.org/0000-0003-2988-7867
AbstractPrecipitation 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.
Highlights A fully multiphysical‐geochemical coupling model is proposed for caprock sealing efficiency. Two‐phase flow, caprock deformation, gaseous CO2 diffusion into matrix and sorption, dissolved CO2 diffusion in water and geochemical reaction are included. Caprock sealing mechanisms with precipitation or dissolution and flow rate are explored. Effects of carbonation and sorption swelling on penetration depth are compared.
A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration
Deep Underground Science and Engineering
Wang, Jianguo (author) / Wang, Huimin (author) / Wang, Xiaolin (author) / Yang, Shengqi (author) / Wu, Hongtao (author) / Leung, Chunfai (author) / Tian, Jiali (author)
Deep Underground Science and Engineering ; 2 ; 188-203
2023-06-01
Article (Journal)
Electronic Resource
English
A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration
| DOAJ | 2023
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