双复杂条件下的波动方程叠前深度偏移

Wave equation pre-stack depth migration with dual-complexity

复杂地表条件下的地震勘探越来越被人们所关注.双复杂条件下的叠前深度偏移方法是解决复杂地表条件和复杂地质构造成像的有效手段."波场上延"法能实现由非水平观测界面开始的偏移过程,解决复杂地表对地下构造成像的影响.复杂理论模型的试算以及实际资料处理表明,"波场上延"方法较好地克服了起伏地形对地下构造成像的影响,取得了令人满意的效果,实现了波动方程基准面校正和深度成像的有机结合.

Increasing efforts have been made to seismic exploration in areas with irregular topography. Pre-stack depth migration with dual-complexity turns out to be a valid way to deal with irregular topography and complex geologic structures. Wave field upward continuation realizes the migration from non-horizontal field surface, solve the near surface complexity＇s affection on the subsurface structures. Numerical tests on theoretical model and real data processing show that the method gives approving results and can effectively combine wave equation redatuming with depth imaging.