Abstract: The buried hill paleogeoomorphology in Damintun sag is resulted from both basement fault block differential lift and weathering erosion. It controls the distribution of remained buried hill strata and affects the distribution of overlying Fangshenpao formation and Sha-4 member. This paper analyzes in detail the contact relationship among the buried hill strata and predicts from the thickness and seismic data of Fangshenpao formation and Sha-4 member that there exist four combinations of lithologic parameters: Type I represents the Archaeozoic metamorphic rocks, reflecting the uplift area of buried hill paleogeomorphology; Type II the Mesozoic sandstone and conglomerate, reflecting the depressed area; Type III and Type IV reflect its slope belt with lithology of Proterozoic carbonate rocks. In plane, Type I, III and IV combinations are favorable areas of reservoir development.

Key words: Damintun sag, buried hill, paleogeomorphology, reservoir rock