基于单程波方程的合成平面波保幅偏移

基于单程波方程的保幅偏移方法不仅能够提供波场的运动学信息,还能够提供动力学信息,实现-定程度上的真振幅偏移。相对于传统偏移算子的单程波偏移方法,保幅偏移加入了振幅补偿项,降低了计算效率。为了提高单程波方程保幅偏移的计算效率,本文提出了基于单程波方程的合成平面波保幅偏移方法,该方法在成倍提高计算效率的同时,可以提供地下目标区域的方向性照明。应用平层模型,对比分析了传统偏移算子与保幅平面波偏移算子的成像效果,应用复杂的Marmousi模型验证了该方法对复杂构造的适应性和有效性。

Synthesized plane wave preserved amplitude prestack depth migration based one-way wave equation

One-way wave equation based preserved amplitude prestack depth migration can not only provide the kinematic but also the dynamic information.It can be called true amplitude migration in a certain extent.Compared with the conventional one-way equation based migration methods,amplitude compensation item is added during the migration which decrease the computation efficiency.In order to solve the problem,we introduce the oneway based synthetic plane wave preserved amplitude migration.It can greatly improved the computation efficiency and provide directional illumination for subsurface structure.First,we derive the synthetic plane wave preserved amplitude migration equation and then test that with plane layer model.We compare and analyze synthetic plane wave migration results from conventional migration operator and preserved amplitude migration operator.Finally,we test with complex Marmousi model to prove the adaptability and validity for complex structure.