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叠前深度偏移是复杂构造成像的重要手段 .本文基于波场分裂理论 ,首先给出了波场延拓的一般方程 ,即一个上下行波的耦合方程组 .通常所用的波场延拓方程就是该耦合方程组的特例 .根据平方根算子的近似 ,推导了一种新的高精度混合法偏移方法 ,用分裂法即可进行计算 .通过对一个横向强烈变速模型的叠后偏移及Marmousi复杂构造模型的叠前偏移计算 ,说明了方法的有效性 ,精度较高 .采用MPI并行编程实现并行计算 ,提高了计算效率 .该方法可用于对横向强烈变速的复杂构造的精确成像
The prestack depth migration is an important method for the imaging of complex structures.Firstly, based on the theory of wave field splitting, a general equation of wave field continuation is given, which is a coupled equations of up and down traveling waves.The commonly used wave field continuation equation Is a special case of the coupled equations.Based on the approximation of the square root operator, a new high precision hybrid method migration method is deduced, which can be calculated by the splitting method.By analyzing the poststack migration of a transverse strong speed model and The prestack migration calculation of the Marmousi complex structural model shows the effectiveness and accuracy of the method.MCP parallel programming is used to realize the parallel computation and improve the computational efficiency.This method can be used for the accurate imaging of complex structures with strong lateral acceleration