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The interaction between CO₂ and rock during the process of CO₂ capture and storage was investigated via reactions of CO₂, formation water, and synthetic sandstone cores in a stainless-steel reactor under high pressure and temperature. Numerical modelling was also undertaken, with results consistent with experimental outcomes. Both methods indicate that carbonates such as calcite and dolomite readily dissolve, whereas silicates such as quartz, K-feldspar, and albite do not. Core porosity did not change significantly after CO₂ injection. No new minerals associated with CO₂ injection were observed experimentally, although some quartz and kaolinite precipitated in the numerical modelling. Mineral dissolution is the dominant reaction at the beginning of CO₂ injection. Results of experiments have verified the numerical outcomes, with experimentally derived kinetic parameters making the numerical modelling more reliable. The combination of experimental simulations and numerical modelling provides new insights into CO₂ dissolution mechanisms in high-pressure/temperature reservoirs and improves understanding of geochemical reactions in CO₂-brine-rock systems, with particular relevance to CO₂ entry of the reservoir.