Understanding of Long-Term CO₂-Brine-Rock Geochemical Reactions Using Numerical Modeling and Natural Analogue Study

Figure 9

Comparison of the initial mineral assemblage of sandstone in the model, measured mineral assemblages of sandstone samples from Well X3 (X3-1, X3-2, X3-3, and X3-4), and simulated mineral assemblages of Base Case and Case 2 after 500,000 years. The simulation results show that the main brine-rock reactions induced by CO₂ include the dissolution of feldspar minerals and carbonate minerals and the precipitation of quartz and kaolinite.