Pore-scale study of mineral reactions in the near-wellbore region for CO₂ storage in deep saline aquifers.

This article focuses on modeling pore-scale reaction transport and mineral dissolution in carbonate rocks during CO2 geological sequestration using the Darcy–Brinkman–Stokes (DBS) model implemented in COMSOL Multiphysics software. The study simulates the dynamic evolution of the fluid–solid interface and investigates how factors such as reservoir temperature, pressure, formation water salinity, and CO2 injection rate influence calcite dissolution and the development of seepage channels. Results indicate that increased salinity lowers pH and accelerates dissolution, while higher temperature, pressure, and injection rates promote calcite dissolution and expand the reactive zone, enhancing CO2 storage capacity. The DBS model's accuracy was validated against the arbitrary Lagrange–Eulerian (ALE) method, confirming its suitability for simulating complex pore-scale reactive transport phenomena relevant to carbon capture and storage technologies.