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中国特有的以陆相沉积为主的含油气盆地,与海相沉积一个显著的不同就是储层物性差、原油粘度高、蜡和胶质含量高、凝固点高,使得CO2驱油与地质埋存存在很多的技术挑战.作者结合中国独特的储层地质特征,利用理论分析和数值模拟方法,针对中国低渗透储层对影响CO2驱油效率与埋存效率的关键因素和技术问题进行了综合分析.结果表明粘度指标、重力分异、储层非均质性以及混相状态是影响CO2驱油与埋存效率的关键因素,在此基础上进一步提出中国注CO2开发低渗透油藏的研究方向以及需要重点注意的几个问题,为CO2注入工程在中国的实施提供了技术参考和指导.
A peculiar continental oil-bearing basin dominated by continental facies has a significant difference from the marine sediments in that it has poor reservoir properties, high crude oil viscosity, high wax and colloidal content, and high freezing point, which makes CO2 flooding and geological storage There are a lot of technical challenges.According to the unique geological characteristics of China’s reservoirs, the author makes a comprehensive analysis of the key factors and technical problems affecting the efficiency and efficiency of CO2 flooding in China’s low-permeability reservoirs by theoretical analysis and numerical simulation The results show that viscosity index, gravitational differentiation, reservoir heterogeneity and miscible state are the key factors affecting CO2 flooding and storage efficiency. Based on this, the research directions of CO2 injection in low permeability reservoirs in China are pointed out. Several issues that need to be paid attention to provide technical reference and guidance for the implementation of CO2 injection project in China.