Abstract: Abstract:Based on the seismic interpretation of different structural profiles, the presalt structure characteristics of the Lower Congo Basin is studied and summarized, which can be divided into two sub basins by a central uplift,ie the inner and the outer riftbasins, while the Atlantic hinge line is the boundary fault between the central uplift and the outer riftbasin. In both outer and inner riftbasins, the structure characteristics can be described as two humps developed in three sags. The structure framework controls the type and distribution of the source rocks, reservoir rocks and the cap rocks, as well as the sourcereservoircap combination and accumulation model. Based on the abovementioned research, this paper points out that the uplift controlled by faults is the clear goal for the next exploration of the presalt layer in the Lower Congo Basin.

Key words: the Lower Congo Basin, presalt structure, petroleum accumulation, exploring strategy