中文摘要：

为了揭示CO2沿断层带泄漏过程的影响因素及其影响规律,建立两相流驱替模型描述CO2的泄漏过程,并通过数值模拟和数值分析建立CO2泄漏影响因素与泄漏特性之间的定量函数关系。以此为基础,提出初步的多因素综合评价方法,为评价CO2泄漏风险提供了一种新的思路。研究表明：咸水层封存CO2沿断层带的稳定泄漏速率与断层和注入井间距的倒数呈对数关系,与断层倾角呈对数关系,与断层宽度呈抛物线关系,与断层渗透率呈幂函数关系,与CO2注入速率和注入深度均呈线性关系。通过综合分析发现,在各种影响因素中,断层破碎带宽度和断层渗透率的影响系数波动最大,说明该两项因素对CO2泄漏的影响很大。另外,CO2注入速率对泄漏速率的影响也比较明显,而断层与注入井间距和注入深度对泄漏速率的影响相对较小。

英文摘要：

A two-phase flow displacement model was developed to describe the leakage process of CO2 and the quantitative functional relationship between the CO2 leakage factors and the leakage characteristics was also developed by numerical simulation and numerical analysis. A preliminary comprehensive evaluation method was introduced, which provides a new way for the evaluation of CO2 leakage risk. The study showed that the stability leakage rate of CO2 along the fault zone had the logarithmic relationship with the reciprocal of the distance between the fault and the injection welU a logarithmic relationship with the dip angle of the fault, the parabola relationship with the width of the fault, and the power function relationship with the permeability of the fault, and linear relationship with the CO2 injection rate and injection depth. Through comprehensive analysis, the influence of the width of the fault fracture zone and fault permeability was determined to be the most significant, which showed that the two factors had a great influence on the leakage of CO2 . In addition, the effect of CO2 injection rate on the leakage rate was strong, while the influence of the distance between the fault and the injection well was relatively small.