After more than 40 years of exploration and development in Dagang oilfield, the main structure has been explored fundamentally and exploration difficulty is increasing by degrees. Taking example for Es3 of the slope zones, on the basis of synthetical analysis of hydrocarbon reservoir accumulation in Es3, we establish lithologic hydrocarbon reservoir accumulation model of “sag-fault-break-uplift” in deep zone of this area by means of palaeogeomorphic recovering research and beneficial sand body predication. The model has been validated by exploration drilling, and shows good exploration potential in northern Beidagang buried hill structural zone.