Integrated geophysical research on macroscopic distribution of Pre-Cenozoic residual basins——A ease in Dagang area
前新生代残留盆地宏观分布的综合地球物理研究——以大港地区为例

How to indicate the macroscopic distribution of Pre-Cenozoic residual basins by geophysical data will be one of the most important study methods. Dagang area is chosen as an example in this paper to test the validity and applicability of integrated geophysical methods. On the base of analysis of rock physical properties,the distributions of gravity basement,magnetic basement,and residual thickness of Pre-Cenozoic group in the study area have been obtained by forward computation and inversion methods. The distribution of residual Pre-Cenozoic group in the study area is characterized by thickening zones in the east-west direction. It is obviously affected by later pressing stress in NW-SE direction. The boundary area between Chengning uplift and Qikou depression is an area with greatest residual thickness of Pre-Cenozoic group. Overthrust tectonics from south to north is in existence in this area. It is beneficial for Pre-Cenozoic hydrocarbon accumulation.