中文摘要：

以深部咸水层二氧化碳地质封存为背景,基于多组分多相流运移理论,对咸水层储存二氧化碳沿断层泄漏的运移规律进行研究。建立二维多岩相结构模型,通过数值方法分析二氧化碳在断层通道和上覆岩层中的运移规律,以及运移过程中二氧化碳相态的变化特征,并对断层的渗透率进行敏感性分析。结果表明,深部咸水层二氧化碳在浓度差和压力差作用下沿断层通道向上覆岩层运移。二氧化碳的密度比水小,重力差使二氧化碳受到向上的浮力,因此在岩层中二氧化碳的分布特征整体上呈类似漏斗的形态。随着泄漏的进行,二氧化碳不断驱替断层通道中的水分,密度减小;随着两相流变成单相流,断层通道逐渐被蒸干。此外,断层渗透率是整个泄露过程中流体运移的重要影响因素。

英文摘要：

Based on the background of carbon dioxide geological storage in deep saline aquifers and the migration theory of multicomponent and multiphase flow,migration mechanism of carbon dioxide in deep saline aquifers during leakage along a fault is studied. A two-dimension multi-facies structure model is established to analyze the migration mechanism of carbon dioxide in the fault channel and overlying formation,and the change of carbon dioxide phases,and sensitivity of fault permeability. Results indicate that under the effect of concentration difference and pressure difference,carbon dioxide in deep saline migrates upward to overlying formation along the fault. The density of carbon dioxide is smaller than water and carbon dioxide is under the buoyancy with gravity,therefore the distribution shape of leakage carbon dioxide in the rocks similars to funnel. With the process of leakage,carbon dioxide displaces the water in the fault channel and the density of carbon dioxide decreases. With the two phase flow into single-phase flow,the fault channel gradually dry out. In addition,fault permeability is the important factor for fluid migration in the process of the leakage.