一种非均匀介质背景的散射层析成像方法研究

The research on a scattering tomography method for inhomogeneous medium background

1. 大庆物探研究所,大庆 163357;2. 中国科学院地球物理研究所,北京 100101

Research Institute of Geophysical Exploration, Daqing Petroleum Administration, Daqing 163357

本文提出了一种非均匀介质背景的散射层析成像方法。它的基本思想是利用波场的正向传播和反向传播原理,将非均匀介质背景的散射层折成像转化为均匀介质背景的散射层析成像,然后利用业以成熟的均匀介质背景的散射层析成像方法进行成像。为了既要减少计算时所占用的大量内存和机时,又要保证计算精度,在波场正传和反传中利用Maslov射线理论计算格林函数,且采用了快速的有限差分射线追踪方法。最后利用理论试界检验了方法的正确性和有效性。

A scattering tomography method for inhomogeneous mediurn background is present in the pa-per. Its basic ideology is to transform the scattering tomography for inhomogeneous medium back-ground into one for homogeneous medium background by using the principles of wavefield forwardand backward propagations,and then perform imaging by the ripe scattering tomography methodfor homogeneous medium background. In order to reduce the memory and time occupied by thecomputation and ensure the computation accuracy,we use the Maslov ray theory to calculate theGreen ' s function in the wavefield forward and backward propagations,and adopt the fast finite-dif-ference ray tracing method. Finally,the theoretical trial computation is conducted to examine thecorrectness and validity of the method.