Fluid-Solid Coupling Between Supercritical CO2 and Minerals in Coal and Geological Significances

Abstract：According to the coal and rock physical features changed by the reaction between the supercritical CO2 and the minerals in coal and the reaction affected to CO2 removing and replacing the coal bed methane mining, the paper introduced the basic principle of the car- bonation reaction between the supercritical CO2 and minerals in coal and stated the reconstruction role of the coal and rock physical fea- tures in the carbonation process of the minerals in coal. Based on the previous research achievements, the paper pointed out that there were big differences existed in the mineral carbonation process under the available lab simulation and the geological conditions. The paper held that the fluid-solid coupling mechanism between the supercritical CO2 and the minerals in coal under the geological conditions would be seriously controlled by the crack system of the coal and rock borehole. The paper pointed out that the fluid-solid coupling role between the supercritical CO2 and the minerals in coal to reconstruct the mineral form and structure as well as to the coal and rock mechanics fea- tures, surface potential, adsorption and others would be further understood. Meanwhile, the paper pointed out that the integrality and weak dynamic conditions of coal and rock structure could be established based on the rational carbonation process of the minerals in coal and effect.