基于Born散射理论的二维黏声介质高斯波束正演

Born散射理论可以通过省略高阶项实现针对一次散射波场的模拟.在这一理论的基础上,本文提出了一种针对二维黏声介质的一次散射波场高斯束Born正演方法.在该方法中,格林函数通过一系列不同初射方向的高斯波束累加获得,可以计算多至走时波场,保证了正演算法的计算精度.同时为了提高计算效率,正演方法使用了wavelet-bank...

2D Born forward modeling for visco-acoustic media using Gaussian beam

The Born scattering formula can be used to simulate the single-scattering wavefield by omitting high-order terms.Based on this theory,we propose a Gaussian beam Born modeling method for the 2D visco-acoustic medium.In this method,the Green′s function is obtained by accumulating Gaussian beams,which can calculate the multi-arrival time wavefield,ensuring the accuracy of the modeling method.At the same time,in order to improve the computational efficiency,the Born forward modeling method employs the wavelet-bank way to synthesize local plane waves.Different from the wavelet-bank method used for acoustic wavefield modeling,we integrate the viscosity information of the medium into the wavelet-bank method,so as to simulate the single-scattering wavefield for 2D visco-acoustic media.The tests on two models show that the Gaussian beam Born forward modeling method for visco-acoustic media proposed in this paper has high calculation accuracy and efficiency.