关键词: 深度偏移, 时间偏移, 相对误差, 速度建模

Abstract: How can the method of prestack depth migration solving geological imaging problems? The answer is given by the basic concept of migration in time and depth domain,and two gages are given in this paper.The relative error of horizontal distance and vertical depth are also given by using the methods of migration in time and depth domain,and these can tell us which geological structure the method of depth migration must be used.The method of depth migration is used to solve the imaging of stratigraphy above which there are slant layers and horizontal viable velocity.In the paper,the depth migration method based on Radon transformation-Gaussian beam principle is introduced.The viewpoints of ray and wave theory are combined in the method which can help us solving the imaging problem of conti-nental deposit stratigraphy.The successful key point of depth migration is the accurate velocity modeling.Therefore,many methods of ve-locity modeling are analyzed.

Key words: depth migration, time migration, relative error, velocity modeling