Elastic wave equation forward modeling for complex surface and complex structure model
Pei Zheng-lin1,2, He Guang-ming3, Xie Fang3
1. CNPC Key Lab of Geophysics,China University of Petroleum,Beijing City,100249,China;
2. North Lintai Oil Science&Technology Company Ltd.,Beijing City,100192,China;
3. Geophysical Technology Development Centre,Chuanqing Geophysical Exploration Company,Chengdu City,Sichuan Province,610213,China
Abstract：Base on the principle and method of geological-geophysical modeling and by integrating typical relief surface and near surface structure with the complex structure model,the flat surface complex structure model,complex surface and complex structure model(without weathering zone)and complex surface and complex structure model(with weathering zone)were established respectively,the 2d wave equation staggered grid high-order finite difference method for arbitrary relief surface was utilized to conduct elastic wave forward modeling for above geological-geophysical model.The numerical simulation results drew the following conclusions:(1):The obvious difference caused by relief surface in the wave field characteristics and shot record appearance for different shot points were represented by the effect of the scattered wave,the obvious difference caused by surface weathering zone in the wave field characteristics and shot record appearance for different shot points were represented by low pass filtering effect.(2):After the model forward data was migrated in depth domain,the horizons,layers and fault points were imaged clearly,the stratigraphic occurrence and the space location match the field model,but failed to represent the fine velocity structure(near surface velocity structure is fairly smooth).
