Abstract: Taking the shale of Lower Sha?3 member and Upper Sha?4 member of Oligocene Shahejie formation in Dongying sag and Zhanhua sag of Baohai Bay basin as a case, this paper systematically studies the enrichment elements of high?yielding shale oil from the perspective of oil and gas generation, migration and accumulation. Integrated with the characteristics of oil and gas productivity, hydrocarbon component, stratigraphic contact relationship, oil saturation and pressure coefficient, the accumulation patterns in Dongying sag and Zhanhua sag can be divided into such 3 types as self?generation and self?preservation, fault connection and interlayer enrichment. Shale oil of selfgeneration and self?preservation widely exists in the shales of the 2 sags, but since it is influenced by the conditions of hydrocarbon generation and accumulation, the oil well productivity of this type is relatively low. Constrained by structure and lithology, the other 2 types are distributed in some local areas but have high productivity. After the identification of shale oil accumulation patterns, more targeted plans can be made for oil exploration and development, thus enhancing efficiency of exploration and development of the shale oils