Reverse-time depth migration of two way acoustic equations and its parallel algorithm
HE Bing-shou
ZHANG Hui-xing
Han Yue
Abstract：Based on two-way acoustic wave equations,a high-order finite difference reverse-time propagation scheme was established using a high precision operator in staggered-grid. According to the splitting method of seismic wave equations, a perfectly matched layer (PML) absorbing boundary condition and its finite difference scheme were also proposed. The amplitude of migration result was corrected by the square of source wavefield to compensate the energy of deep stratum. Based on above techniques,the pre-stack reverse-time depth migration of compressional seismic wave was achieved in two dimensional space. The impulse response implies that the algorithm has the advantage of energy compensation and applicable for dip angle reflector imaging. In order to improve the processing speed, studied a parallel algorithm of reverse-time migration based on Message Passing Interface(MPI). The computation domain division method and communication scheme that were suitable for parallel algorithm was proposed. Using above algorithms, a coarse-grained parallel reverse-time migration algorithm was realized, which could improve the computation efficiency greatly, and the synthetic data processing of marmousi model obtained a satisfactory result.
Keywords：two way acoustic equationreverse-time migrationparallel computingfinite differenceboundary conditions
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 458-462 )