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时间剖面中的倾斜反射界面是经过畸变的,为获得关于界面空间位置及其几何形态的正确概念,必须进行界面的空间归位处理。各类空间归位处理按其具体实现方法的不同,在地震数字处理技术中被取名为迭加偏移、绕射扫描、加权偏移、积分法等等。本文试图从广义绕射的观点对基于严格波动方程积分形式解和非波动方程解的各类偏移方法作统一的论述;由于惠更斯原理是实现空间归位所依据的唯一基本原理,因而可以将各类不同偏移方法容纳在统一的理论模式之中,用统一的观点评述处理方法的物理实质和处理效果的限度。根据广义绕射变换观点的分析,指出,基于波动方程解的各类选偏
The oblique reflection interface in the time profile is distorted. To obtain the correct concept of the spatial location of the interface and its geometry, a spatial homing of the interface must be performed. Various types of space homing processing according to their specific methods of implementation, digital seismic processing technology was named as superimposed migration, diffraction scanning, weighted offset, integral method and so on. In this paper, we try to make a uniform discussion of various kinds of migration methods based on the solution of integral form and non-wave equation of strict wave equation from the viewpoint of generalized diffraction. Since Huygens principle is the only basic principle on which space homing is based, Various types of migration methods can be accommodated in a unified theoretical model, with a unified point of view to comment on the physical substance of the treatment method and the limits of the treatment effect. According to the analysis of generalized diffraction transformation, it is pointed out that all kinds of polarization selection based on wave equation solution