A multiphysical-geochemical coupling model for caprock sealing efficiency in CO_(2) geosequestration

作     者：Jianguo Wang Huimin Wang Xiaolin Wang Shengqi Yang Hongtao Wu Chunfai Leung Jiali Tian Jianguo Wang;Huimin Wang;Xiaolin Wang;Shengqi Yang;Hongtao Wu;Chunfai Leung;Jiali Tian

作者机构：School of Mechanics and Civil EngineeringChina University of Mining and TechnologyXuzhouChina State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhouChina College of Water Conservancy and Hydropower EngineeringHohai UniversityNanjingChina School of EngineeringUniversity of TasmaniaHobartTasmaniaAustralia Center for Offshore Research and EngineeringNational University of SingaporeSingaporeSingapore 

出 版 物：《Deep Underground Science and Engineering》 (深地科学（英文）)

年 卷 期：2023年第2卷第2期

页      面：188-203页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 

基　　金：National Natural Science Foundation of China,Grant/Award Number:51674246 Creative Research and Development Group Program of Jiangsu Province,Grant/Award Number:2014-27 

主　　题：caprock sealing efficiency CO_(2)diffusion CO_(2)geosequestration geochemical reaction sorption strain 

摘      要：Precipitation or dissolution due to geochemical reactions has been observed in the caprocks for CO_(2) *** reactions modify the caprock sealing efficiency with self-limiting or ***,the effect of this modification on the caprock sealing efficiency has not been fully investigated through multiphysical-geochemical coupling *** this study,a multiphysical-geochemical coupling model was proposed to analyze caprock sealing *** coupling model considered the full couplings of caprock deformation,two-phase flow,CO_(2) concentration diffusion,geochemical reaction,and CO_(2) *** two-phase flow only occurs in the fracture network and the CO_(2) may partially dissolve into water and diffuse through the concentration *** dissolved CO_(2) has geochemical reactions with some critical minerals,thus altering flow *** CO_(2) in the fracture network diffuses into matrix,causing the matrix *** fully coupling model was validated with a penetration experiment on a cement cube and compared with two other models for CO_(2) storage ***,the effects of geochemical reactions on penetration depth and pore pressure were studied through parametric *** numerical simulations reveal that the coupling of geochemical reactions and matrix diffusion significantly affect the caprock sealing *** reactions occur at a short time after the arrival of CO_(2) concentration and modify the fracture *** CO_(2) diffusion into the matrix requires a much longer time and mainly induces matrix *** effects may produce selfenhancement or self-limiting depending on the flow rate in the fracture network,thus significantly modifying caprock sealing efficiency.