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引言对于横向速度迅速变化的复杂地质环境,用时间偏移法解决构造成像问题是不合适的。这主要是由于时间偏移不能正确处理速度边界的绕射,从而导致同相轴的错位和不聚焦。相反,采用深度偏移方法就会取得令人满意的结果。理想情况下,深度偏移应该对每一条叠前射线路径进行处理。然而,三维叠前深度偏移仍然不能应用到三维数据体的现实使我们不得不作三维叠后深度偏移处理。幸运的是,近年来,
INTRODUCTION For complex geological environments with rapidly changing lateral velocities, it is not appropriate to solve the problem of tectonic imaging with the time-shift method. This is mainly due to the fact that the time offset can not properly handle the diffraction of the velocity boundary, resulting in the misalignment and inaccuracy of the events. On the contrary, the use of depth migration method will achieve satisfactory results. Ideally, the depth offset should process each pre-stack ray path. However, the fact that 3D pre-stack depth migration still can not be applied to 3D data volumes has forced us to make 3D post-stack depth migration. Fortunately, in recent years,