关键词: 厚油层, 相结构, 剩余油, 开发后期, 分布特征

Abstract: On the basis of predicting the remaining oil in Shuanghe Oilfield during the late period of development,this paper puts forward the procedure that builds the microfacies architecture pattern.According to the distribution of the interlayer, the thick pays are subdivided into many flow units to form the architecture framework.The built patterns include distributary channel,transition and front sheet sand types,which based on closely spaced wells and core data. Difference can be shown on the type, scale,geometry and buildup of microfacies.With the oil field developed deeply,waterflooding within thick pays is being more serious,and distribution of the remaining oil become more complex;however,the enrichment zones of remaining oil are restrained apparently with the microfacies architecture.Mini-lens and edge-bridge are two types of enrichment of remaining oil during the late period of development as the result of recovering and controlling badly the small scale and bad quality microfacies.In addition,the buildup,scale and joint manner of framework microfacies determine the movement of water and oil and the distribution of remaining oil.Thus,the remaining oil can be predicted by using the microfacies architecture within thick pays to provide basis for stabilizing production and controlling water-cut.

Key words: thick pay, microfacies architecture, remaining oil, late period of development