Abstract: The water drive reservoir of V block in Xinli oilfield has entered ultra- high water cut stage,the residual oil is generally dispersed with accumulation in certain areas.In this paper,with the concept of remaining oil enrichment regularity,as well as the preliminary static basic geological work,we study the effect of a variety of geological factors on the residual oil distribution.Research suggests that there are a certain scale of potential residual oil zone mainly controlled by geological factors such as sedimentary microfacies,interlayer insulation,rhythm distribution and so on.Generally speaking,the main residual oil enrichment region is in the edge of sedimentary facies and in the region of interlayer enrichment.On the basis of rhythm controlling residual oil distribution in vertical direction,we can have an effective exploration of residual oil.