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为了对复杂地质体实现精确的偏移归位,在使用相移与相移插值方法时,成像质量和计算效率这两个因素是我们必须考虑的。为此针对实际中遇到的各种问题,对相移及相移插值方法进行了如下技术上的改进:讨论空间域内的动态边界吸收法;首次提出波数域滤波方法,这两种方法有效克服了端点效应并使计算效率显著提高;阐述小速度偏移方法并对相移因子进行分析实践证明二者明显改善了偏移剖面的成像质量。
In order to achieve precise offset homing for complex geologic bodies, we must consider the two factors of imaging quality and computational efficiency when using the phase-shift and phase-shift interpolation methods. In view of the various problems encountered in practice, the phase shift and phase shift interpolation methods are improved as follows: the dynamic boundary absorption method in the space domain is discussed; the wave number domain filtering method is proposed for the first time, and both of these methods effectively overcome The end effect and the computational efficiency are obviously improved. The method of small velocity migration is described and the phase shift factor is analyzed. It has been proved by practice that both of them significantly improve the imaging quality of the migration profile.