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变速绕射叠加偏移直接用射线速度(射线等效速度)算出绕射时间进行绕射求和,以实现非均质情况地震信息的正确归位。本文从理论和实践上说明了非均质情况的偏移,其本质在于速度参数的运用是否符合非均质特点和速度结构的假定是否接近剖面实际,而不在于是否要采用波动方法或是否要在深度域进行,并指出使用射线速度的变速方法可适合于绕射求和类型的所有偏移。
Variable speed diffracted superposition offset is directly calculated by using the ray velocity (ray equivalent velocity) to calculate the diffraction time so as to achieve correct homing of the seismic information in the heterogeneous situation. In this paper, we theoretically and practically explain the offset of inhomogeneous conditions. The essence of this paper is whether the application of velocity parameters conforms to the assumption of heterogeneity and velocity structure, and whether it is close to the actual section or not. It does not depend on whether the volatility method is to be used or not Is done in the depth domain and indicates that all the offsets of the type of the diffraction summation can be adapted to the method of transmission using ray velocities.