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

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Abstract
In this study, the Darcy–Brinkman–Stokes (DBS) model based on the theory of microscopic continuous media is used to model the pore-scale reaction transport in rocks. This reaction transport is solved discretely using a coupled Multiphysics-field simulation software to investigate the dissolution reactions and the evolution of porous media during carbon sequestration. The DBS model elucidates the inherent nonlinear coupling of mineral-dissolution processes, offering insights into the intricate relationship among the seepage, solute transport, and reaction-fluid chemistry. The findings indicate the progressive dissolution of soluble minerals with time to form new seepage channels, subsequently reducing the dissolution rate within the original seepage channels. Additionally, the increased salinity of the formation water decreases the solution pH, affecting the chemistry of the reservoir minerals. Conversely, increased reservoir temperature, pressure, and injection rate promote calcite dissolution. Furthermore, the augmented pressure differential promotes the expansion of the reaction zone toward the midstream, accelerating the dissolution and reaction processes of the calcite nodes. Overall, these findings offer a theoretical foundation for future carbon capture and storage technologies.
Funding Information
  • Natural Science Foundation of Sichuan Province (2024NSFSC2019)
  • Natural Science Foundation of Sichuan Province (2023NSFSC0759)

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