多地质目标地表控制照明叠前深度偏移

控制照明偏移是面向地质目标的快速偏移技术，它可通过控制目的层处震源波场的方向特性，改善目标区域的成像质量。本文提出的多目标地表控制照明方法，旨在针对介质的复杂情况，适当选取多个目的层，同时对多个目标区域进行地表控制照明，从而获得多个目标区域构造的更精细成像。文中对Marmousi模型进行了多目标地表控制照明偏移数值计算，并与单目标地表控制照明、常规炮域及平面波偏移等方法进行了比较，结果表明多地质目标照明叠前深度偏移不仅能够显著提高多个目标区域的成像质量，而且对于常规炮域偏移也具有较高的计算效率。

Prestack depth migration by surface-controlled illumination of multi-geologic targets.

Prestack depth migration by controlled illumination is a fast and geologic-targ et-oriented migration technique.It can improve the image quality of the targets by controlling the directional characteristics of incident source wavefields at the targets.We proposed a method for surface controlled illumination of multi -geologic targets,which directed to complex media,appropriately selected mul tiple targets and controlled the source wavefields illumination of multiple targ ets at the same time to obtain the fine image of structures at the multi-target s.The Marmousi model was used for numerical computation of the method and the r esults were used to compare with that migrated from the method for surface contr olled illumination of single-target and with the migrated results of convention al shot gathers and plane wave as well.The results showed that prestack depth mi gration by illumination of multi-geologic targets not only can greatly improved the imaging quality in multi-targets area,but also has higher computational ef fort for ordinary migration in shot domain.