超临界CO_2与煤中矿物的流固耦合及其地质意义

针对超临界CO2与煤中矿物反应改变煤岩物性、影响CO2驱替煤层气开采的现状,介绍了超临界CO2与矿物碳酸化反应的基本原理,评述了煤中矿物碳酸化过程对煤岩物理性质的改造作用。基于前人研究成果,指出现有实验室模拟与地质条件下煤中矿物碳酸化过程存在很大差异,认为地质条件下超临界CO2与煤中矿物的流固耦合机理严格受控于煤岩的孔裂隙系统,指出超临界CO2与煤中矿物流固耦合作用对矿物形态与结构及煤岩力学性质、表面电性、吸附性等的改造有待进一步认识。并指出煤岩结构的完整性和弱水动力条件是建立合理煤中矿物碳酸化过程及效应的基础。

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

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 carbonation reaction between the supercritical CO2 and minerals in coal and stated the reconstruction role of the coal and rock physical features 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 features,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.