Application of the grid tomography and Gauss beam migration in velocity modelling in the depth domain
GU Yanbin1, ZHANG Xudong2, YAO Zheng1, LIU Taoran2, DONG Yuwen1, WU Xinxing1
1. Data Processing Center, GRI, BGP Inc., CNPC, Zhuozhou, Hebei 072750, China; 2. Research and Development Center, BGP Inc., CNPC, Zhuozhou, Hebei 072750, China
Abstract:The imaging quality of prestack depth migration depends on the accuracy of velocity model and the choice of migration methods.According to characteristics of current velocity inversions and depth migration methods,the combination of the grid tomography inversion and the compressed Gauss beam migration can improve not only the accuracy of velocity model,but also greatly improve the efficiency of velocity model optimization.The proposed approach has achieved good results in seismic data imaging.
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