Based on the comprehensive analyses of seismic，wireline log and drilling data，core and analytical and testing results，integrated analyses have been carried out on the sedimentary facies of the Member 3 of Paleogene Dongying Formation and the sedimentary facies maps have been compiled. The lower part of Member 3 of Dongying Formation is dominated by fan delta，braided fluvial delta，lacustrine and sublacustrine fan facies. The braided fluvial delta of the lower part of Member 3 of Dongying Formation was developed in southwestern and northern areas of the Huanghekou Sag. The fan delta was developed in the south and north sides of the Bonan uplift. The semideep to deep lake was developed in the western deep sagging area and the sublacustrine fan in the semideep lake south of the B2 faulted uplift belt and most areas were dominated by shoreshallow lacustrine facies including shoreshallow lacustrine muddy bank and mixed bank. During the deposition of the upper part of Member 3 of Dongying Formation，braided fluvial delta facies was developed and mainly distributed in the southwestern and southern parts of the sag and the southern side of the D4 faulted uplift belt，fan delta was limited to the northern side of the Bonan uplift，and semideep to deep lacustrine facies was developed in the western deep sagging area which was dominated by shoreshallow lacustrine facies. The sandy beach bar was developed in the E-1-1—F-4-1 well area. The sandy beach bar is composed of gravelly coarse sandstones，gravelly medium grained sandstones and mediumfine grained sandstones with the detrital grains being dominated by quartz. Low angle cross bedding was developed. The shoreshallow lacustrine sandy beach bar microfacies is the favorable facies belt for high quality reservoir development.