Abstract: With respect to the severe situation of Global Greenhouse Gas (GHG) reduction，CO2 Capture and Storage (CCS) was put forward.CO2 storage in deep saline aquifers is estimated to have the most storage capacity and be the most promising in all storage methods.Based on geology characteristics of China，silicate geology was selected as the CO2 storage stratum.Some problems on mass transfer of supercritical CO2 storing in deep silicate geological stratum were numerically investigated by using software TOUGHREACT.The acidity and basicity，mineral components and captured CO2 were mainly investigated.After injection for 10 years，at the depth of 750 m along the radial direction，the pH value of the saline aquifers increases；the gas saturation (SG) is 1 in the neighboring area of the injection point，and decreases to 0 gradually；the volume fraction of calcite increases and falls back to the original level of the saline aquifer；the variation of the CO2 captured by minerals is similar to that of calcite；the volume fraction of HCO-3 is closely related with CO2 and CO2-3 which increases in the middle area，and falls back to the original level.Conducting simulation research on CO2 storage in deep saline aquifers would be beneficial to understand the CO2 storage mechanism more deeply.

摘要： CO₂的深盐水层埋存被认为是埋存量最大、最有前景的CO₂埋存方式。通过针对我国地质特点，选取硅酸盐地质层为CO₂埋存层，利用TOUGHREACT软件，数值模拟研究了超临界CO₂埋存在硅酸盐地质层中的传质问题，得到以下结论：注入CO₂ 10年后，深度750 m处，盐水层pH值沿着远离注入井方向呈增大趋势；气体饱和度在近注入点附近区域为1，后沿径向逐渐降到0；方解石容积分数沿径向增加，最终回落到与盐水层中原有含量相同水平；矿物捕获的CO₂变化趋势与方解石相仿；HCO^-₃的变化趋势与CO₂气体和CO^2-₃浓度的变化密切相关，在注入中段区域增加，后回落到盐水层原有水平。这些结果有益于认识CO₂埋存机理。

关键词: 二氧化碳减排, 深盐水层埋存, 数值模拟