Abstract: Gravity flow sedimentary system developed in Es_1 formation of Madong oilfield,which is difficult to identify and track the reservoir because of the buried depth,the overlapping of sand bodies,and the variation of well thickness,therefore,the study on the effective reservoir prediction was carried out.Aiming at the unapparent difference between the reservoir and the surrounding rocks,the favorable sedimentary facies belts were predicted by using pseudo acoustic inversion,and the inversion results can effectively predict the reservoir distribution.The oil-gas bearing property in the favorable sedimentary facies belt was analyzed by using the attenuation attribute analysis technique,and then the effective reservoir distribution characteristics were analyzed.The effective reservoir prediction results were in good agreement with the actual drilling situation,which pointed out the favorable target area and provided an important basis for the preparation of the conceptual plan in the next step.