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The concept of the three-layer structure of continental basins is presented based on the characteristics of layered structure of basins.The reservoir could be classified into accumulation system assemblage,accumulation system,accumulation assemblage and reservoir.This paper discusses the characteristics of hydrocarbon accumulation system assemblages of the Zhanhua Depression,which include four kinds of genetic patterns:(1)buried-hill hydrocarbon accumulation system assemblage; (2)self-sourced accumulation system assemblage from the upper interval of member 4 to member 1 of Shahejie formation;(3) transition accumulation system assemblage from member 1 of the Shahejie formation to Dongying formation and(4)externally sourced accumulation system assemblage in the late Tertiary.The hydrocarbon-source transport network layer consisted of faults and unconformities,which connected with the reservoir layer.
The concept of the three-layer structure of continental basins is presented based on the characteristics of layered structure of basins. The reservoir could be classified into accumulation system assemblage, accumulation system, accumulation assemblage and reservoir. This paper discusses the characteristics of hydrocarbon accumulation system assemblages of the Zhanhua Depression, which include four kinds of genetic patterns: (1) buried-hill hydrocarbon accumulation system assemblage; (2) self-sourced accumulation system assemblage from the upper interval of member 4 to member 1 of Shahejie formation; ) transition accumulation system assemblage from member 1 of the Shahejie formation to Dongying formation and (4) externally sourced accumulation system assemblage in the late Tertiary. hydrocarbon-source transport network layer consisted of faults and unconformities, which connected with the reservoir layer.