Abstract: The pore and fracture are widely developed in sandstone, carbonate rock and magmatite under unconformity, which tend to forming high porosity and high permeability belts, while those in mudstone are filled by recrystallization due to deuterodiagenesis without permeability. These belts are possible to shape the main passageway of long-distance oil migration because crude remained in the fractures and pores can be seen by core and microscopic observation. This paper presents the process of stratigraphic reservoir's oil accumulation in south slope of Dongying sag, and sets up two types of oil-gas migration patterns under unconformity: one is lateral migration pattern, and the other is clearstory-like vertical migration pattern.

Key words: stratigraphic unconformity, porosity and permeability feature, petroleum migration, transport pattern