① 成都理工大学信息工程学院,四川 成都 610059;
② 东方地球物理公司博士后工作站,河北 琢州 072751;
③ 东方地球物理公司物探技术研发中心,河北 琢州 072751;
4 河北省琢州市东方地球物理公司物探技术研发中心,072751
Gaussian beams forward simulation and migration
Deng Fei1,2,4, Liu Chao-ying3, Zhao Bo3, Wang Cheng-xiang3
1. College of Information Engineering, Chengdu University of Technology, Chengdu City, Sichuan Province, 610059, China;
2. BGP Post-Doctor Work Station, Zhuozhou City, Hebei Province, China;
3. Technical Research Center of Geophysical Prospecting, BGP, Zhuozhou City, Hebei Province, 072751, China
Abstract：On the basis of introducing Gaussian beams principle and forward simulation, the paper analyzed the basic principle of Gaussian beams migration starting from poststack migration and gave optimized idea and concrete algorithm flow. The Gauss beam is high-frequency approximate solution that wave equation centralized around the ray, which closely combines the ray theory with wave equation. Replacing the ray in common ray method, using Gaussian beams to carry out wave forward simulation and continuation both keeps the high-efficiency and flexibility of ray method and retains the dynamic feature of wavefield; not only overcomes some shortcomings of conventional ray method, but also is high efficiency because without two-point trial-ray shooting. Introducing Gaussian beams into migration and using the property of Gaussian beams are able to solve the issue of multi-value travel-time in Kirchhoff method. The model test showed the Gaussian beams migration introduced in the paper is able to fully use the superiority of Gaussian beams, both having high efficiency and getting better imaging results.
