DISTRIBUTION MODE OF REMAINING OIL OF FLUVIAL AND DELTA RESERVOIR——TAKING THE SHENGTUO OILFIELD OF THE BOHAI BAY BASIN AS AN EXAMPLE

The paper studied mechanism and distribution of macro and micro remaining oil in fluvial and delta reservoir,and built distribution mode of macro and micro remaining oil.The paper put forward that the remaining oil in fluvial and delta reservoir enriched mainly in margin facies,hereabout fault,round wedgeout and part uncontrolled by well.The plane distribution of remaining oil is mainly controlled by sediment microfacies,fault and sand distribution.The interlayer distribution of remaining oil is mainly controlled by vertical heterogeneity.The remaining oil enriched in upside of positive rhythm reservoir of fluvial while in downside of negative rhythm reservoir of delta.Micro remaining oil has five shape types,such as network,speckle,attached,trickle and confuse of oil and water.