Abstract: The depositional environment map of buried hills js a comprehensive map which reflects petrol!eum geology of the buried hills. Detailed mapping method and procedures are as follows: (1)to map the geometric shape of the erosion surface of the buried hills, (2)to do indoor geologic mapping, (3)to deterine the distribution of the drape on the buried hills, and (4)to determine the oil and gas generation area. Stacked and migrated seismic profijies demarcated with regional wildcats and having certain precision are the fundamental Cata used for drawing the depositional envi-ronment map. In the late 70s, these methods were used for the research of oil and gas reservoir formation condition of the buried hills in the western part of the Bohaiwan Basin.

Key words: Depositional environment of buried hills, Stacked migration profile, Geometric shape of erosion surface, Geologic mapping, Drape, Oil generation area, Reservoir formation condition