Remaining Oil Distribution Pattern and Potential Tapping Measures of M Buried Hill Fractured Cave Reservoir in Jidong Oilfield

It is difficult to understand the distribution of residual oil and tap its potential in the M buried hill fractured carbonate reservoir of Jidong Oilfield after a high water cut. Starting from the actual situation of the reservoir, the testing and production performance data of the reservoir are analyzed to reveal the oil-water movement law of the dual medium reservoir. On the basis of geological modeling of fractured and matrix dual medium reservoirs, two technical methods, reservoir engineering and reservoir numerical simulation, are used to conduct research on the distribution of residual oil in dual medium reservoirs, implement the distribution pattern of residual oil, determine the distribution mode of residual oil, clarify the potential for development adjustment and enhanced oil recovery. Based on the research results of remaining oil distribution, combined with production practice, the potential tapping countermeasures for blocks are proposed, and the potential tapping countermeasures and directions of nitrogen injection and nitrogen foam injection for enhanced oil recovery are determined. The research results have certain guiding significance for the development of similar buried hill reservoirs.