CHARACTERISTICS OF THE CENOZOIC STRUCTURAL EVOLUTION IN THE NORTH OF THE DONGYING SAG, THE BOHAIWAN BASIN

Based on the equilibrium section principle and by decompaction correction, the profiles of the Cenozoic structural evolution in the north of the Dongying Sag, the Bohaiwan Basin and the paleostructural maps of the subface of the Sha-3 Member before the sedimentation of the Sha-1 Member and the Guantao Formation were compiled. Starting with the evolution profiles and the plane paleostructures, the characteristics of the Cenozoic structural evolution in the study area were summarized systematically. The study showed that the present subface structural configuration of the Sha-3 Member was formed before the sedimentation of the Sha-1 Member, and decollement faults were developed in the caprocks of the study area. The results were of good reference values for the studying of structural evolution process of the similar areas.