Reservoir sedimentary model of fluvial facies and it’s control toremaining oil distribution

The reservoir sedimentary models of fluvial facies in Guantao group of Gudao and Gudong Oilfields in the eastern Zhanhua sag were studied.The remaining oil distribution in the fluvial facies reservoirs and its control to the formation and distribution of the remaining oil were discussed.The fluvial facies reservoir in this area developed two sizes of heterogeneous sedimentations.The combination of the two heterogeneities is the main factor for controlling the macroscopic and microscopic distribution of the remaining oil in the fluvial facies reservoir.The remaining oil is macroscopically distributed in the pole oil layer,the median and top of the main rhythm,and the units with low seepage,and the areas where the injection-production technology is unperfected.From the microscope,the netlike and spotted remaining oil still exists in the lower watered-out position and a part of blind area with the finer reservoir characteristics.The study result indicates that the sedimentary model is the most important factor for controlling the distribution of remaining oil in the fluvial facies reservoir.