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 CO 2 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, CO 2 concentration diffusion, geochemical reaction, and CO 2 sorption. The two-phase flow only occurs in the fracture network and the CO 2 may partially dissolve into water and diffuse through the concentration difference. The dissolved CO 2 has geochemical reactions with some critical

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