并行合成震源记录逆时深度偏移

Parallel synthetic source record reverse time depth migration

本文提出了一种基于双程无反射波动方程的合成震源记录逆时深度偏移方法,该方法利用波动方程算子的性质,合成炮震源和炮震源记录,有效地节省了计算时间。在叠前偏移中使用了考虑波传播方向的Pothyn矢量成像条件,能够有效消除逆时偏移中的浅层噪声。在此基础上又应用了MPI并行算法,进一步提高了此算法的计算效率。文中通过模型试算结果检验,说明了该方法的有效性和实用性。

A synthetic source record reverse time depth migration method which is based on two way nonreflecting wave equation was proposed in this paper. The method utilizes the feature of the wave equation operator to synthesize the shot source and shot source records,so the calculation time was greatly saved. In the pre-stack migration processing the Pothyn vector imaging condition in which wave propagation direction is considered was used,whicn can effectively remove the shallow noise in reverse time migration. Based on the method MPI parallel algorithm was applied,so its calculation efficiency was further improved. The modeling test results obtained in this paper proved the method's effectiveness and practicality.