摘要
As an important type of marine oil-gas reservoirs,especially in western exploration area,fractured carbonate reservoir often has many special features,including a fracture-cave formation,a deep buried depth,complex reflection wave components and difficult analysis of its wave field characteristics.Due to such features,it is difficult to image fractured-type carbonate reservoir with high-resolution.In this paper,the basic theory of least-squares migration(LSM) is deduced and then we implemented this migration approach.The imaging results of equivalent seismo-geological models of fractured carbonate reservoir have showed that LSM had a good resolution on 20-meter scale fractured carbonate reservoir with a depth of more than 3000 meters,and it is well adaptable when used to prospect fractured-type carbonate reservoir in the western exploration area.