中文摘要：

深部盐水层是二氧化碳地质封存重要的封存场所,而深部盐水层具有强烈的非均质性,这对二氧化碳的扩散规律和分布特征具有着重要的影响。本文通过建立二维分层结构模型进行数值模拟,分析了二氧化碳注入过程中岩层压强的变化和气相二氧化碳扩散情况,并对3组不同模型进行对比。模拟结果表明二氧化碳受浮力向上扩散,在盖层底部发生侧向迁移。盖层底部岩层为主要封存储层,而且该岩层渗透性越好二氧化碳封存越安全。

英文摘要：

Deep saline aquifers are important place for CO2 geological storage, and it has a strong anisotropism t-hat has an important impact on migration and distribution of the injected CO2. This paper analyses the pressure ch-ange at different rock stratum and diffusion of gas CO2 by establishing two-dimensional model for numercal simu-lation, and compares one model with the other two. The results indicate that CO2 diffuses upward by buoyancy, then it moves in horizontal direction under the cap rocks. And the stratum under the cap rocks is the main sto-rage reservoir. The more permeability the stratum is, the safer storage will be.