储存于地下岩层中的CO2与矿物发生化学反应导致次生碳酸盐矿物的沉淀,CO2将以碳酸盐矿物的形式长时间地固结在储层岩石中,从而有效减少CO2向大气中的排放.通过对不同温度下CO2 -H2O -砂岩相互作用机理的研究,以及反应后样品的扫描电镜观察、质量损失量和剩余反应液中总矿化度变化的分析发现:砂岩样品的溶蚀程度随温度的升高而逐渐增强；100℃和175℃时样品表面分别有方解石和白云石生成,250℃时新生成的矿物因温度过高而溶解.这表明CO2能够以碳酸盐矿物的形式固定在矿物中,175℃为本实验所证明较适合的贮存温度.%Due to the chemical interaction of the minerals with CO2 stored in underground rock formations, the secondary carbonate minerals precipitated and stored in rock formations in long term. As such so, the concentration of CO2 decreasingly discharged into the air. In this study, the mechanisms of the interaction of CO2, H2O and sandstone in different temperatures were investigated. Moreover, the scanning electron microscope (SEM), the weight lost and the variation of total mineralization were analyzed. The results showed that the erosion of sandstone increased with increasing temperature and the calcite and dolomite produced at 100 'C and 175 'C. The new minerals dissolved when the temperature increased up to 250 癈. In general, the results in this study demonstrated that the CO2 could be stored as carbonate minerals in underground rock formations and the optimal temperature is 175 'C.
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