中国低渗透油藏CO_2驱油与地质埋存关键问题分析(英文)

KEY PROBLEMS ANALYSIS ON CO_2 DISPLACEMENT AND GEOLOGICAL STORAGE IN LOW PERMEABILITY OIL RESERVOIR,CHINA

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.

Compared with marine deposit basin,continental sediments basins of China have unique characteristics of reservoir and fluid,such as poor physical property,high viscosity,high wax resin content,high freezing point,etc.So the CO2 EOR and geological storage will face many technical challenges.In this article,combining the unique reservoir geologic features,the key factors effect on CO2 oil displacement efficiency and storage efficiency technical problems were analyzed with the theory analysis and numerical simulation method aimed at low permeable reservoir in China.Analysis results show that the viscous fingering,gravity segregation,reservoir heterogeneity and miscible state make an important effect on CO2 displacement efficiency and storage efficiency.Meanwhile,same research directions and main problems were proposed further based on above analysis,to provide a technical guidance for the implementation of CO2 injection project in China.