SEDIMENTARY FACIES EVOLUTION AND FAVORABLE SANDSTONE BODY PROSPECTION IN THE THIRD TO FIRST MEMBERS OF THE SHAHEJIE FORMATION OF PALEOGENE IN THE CHEZHEN SAG OF THE BOHAIWAN BASIN

With comprehensive study of outcrop,drilling,ancient life,well logging and seismic data,the Paleogene Es~3-Es~1 strata of study area are divided into 2 secondary and 4 third class sequences,and dividing system tract further.For each system tract period,inshore submerged fan,fan delta,delta,sublacustrine fan and lake facies are generated respectively.Favorable sandstone body is predicted.10 favorable districts which can be classified into 4 types are put forward.All these provide technical supports for subtle reservoir exploration.