Application of FWI in the imaging of the interior of Archean buried hill in Bohai Bay

Archean buried hill is an important exploration and development layer in Bohai oilfield in recent years. It is found that the development degree of inner fractures in Archean buried hill of Bohai Sea is controlled by inner faults. The inner faults have a good indication to the reservoir. Therefore, accurate imaging is the basis of reservoir prediction. High precision velocity modeling is undoubtedly the focus of data processing. In this paper, based on 2D numerical model, the applicability of FWI method in non layered formation inside buried hill is verified, and then FWI is used to apply the actual data. Compared with the conventional tomographic inversion of velocity slicer and migration profile, FWI is proved to be correct in modeling the interior of buried hill, and the quality of interior imaging is significantly improved, which lays a good data foundation for subsequent reservoir prediction.