低渗油藏注水开发效果一般较差，采用CO₂驱油能有效提高原油采出程度。为分析影响CO₂辅助重力驱油效果的各种因素，从注气辅助重力驱油研究机理出发，建立一注一采的机理模型，分析地质因素与开发因素的影响规律，并采用正交试验设计方法和Shapley值方法进行多因素分析。研究结果表明：正韵律储层更适合CO₂辅助重力驱油；储层倾角、平均渗透率、注气速度与开发效果呈正相关；垂向渗透率与水平渗透率比值、渗透率级差与开发效果呈负相关；中上部位置注气及无因次水平井段长度比值设置为0.8可以有效提高CO₂辅助重力驱油效果；垂向渗透率与水平渗透率比值对CO₂辅助重力驱油影响程度最高。该项研究成果为提高低渗油藏CO₂辅助重力驱油的开发效果提供了技术指导和理论支持。

The effect of water flooding development in low permeability reservoir is generally poor, and CO₂ flooding can effectively improve the degree of crude oil recovery. In order to analyze various factors affecting the effect of CO₂-assisted gravity flooding, based on the research mechanism of gas-injection-assisted gravity flooding, a mechanism model of one injection and one production was established to analyze the influence law of geological factors and development factors, and the orthogonal experimental design method and Shapley value method were used for multi-factor analysis. The results show that the positive rhythm reservoir is more suitable for CO₂-assisted gravity flooding. Reservoir dip angle, average permeability and gas injection velocity are positively correlated with development effect. The ratio of vertical permeability to horizontal permeability and the difference of permeability stage were negatively correlated with the development effect. If the ratio of gas injection and dimensionless horizontal well section length is set to 0.8, the CO₂-assisted gravity flooding effect can be effectively improved. The ratio of vertical permeability to horizontal permeability has the highest influence on CO₂-assisted gravity flooding. The research results provide technical guidance and theoretical support for improving the development effect of CO₂-assisted gravity flooding in low permeability reservoirs.