Angle domain pre-stack migration imaging studies and application
Liu Wen-qing1,2, Wang Xi-wen2, Wang Yu-chao2, Shao Xi-chun2, Hu Zi-duo2, Kou Long-jiang2
1. Chengdu University of Technology,Chengdu City,Sichuan Province,610059,China;
2. Northwest Branch,Research Institute of Petroleum Exploration&Development of Petrochina,Lanzhou City,Gansu Province,730020,China
Abstract：For the common offset gathers the multi-path issue of the seismic wave propagation in the complicated medium causes inaccurate reflection points.The common reflection angle gathers overcomes the problem above so the complex subsurface structures can be accurately imaged,the common reflection angle gathers can be used in the AVA analysis and amplitude-preserved migration imaging studies,especially for the complicated structure areas with wide reflection angle and multi-wave arrivals,the amplitude and phase of the reflection events were effectively preserved.Based on the common reflection angle migration method,the common reflection angle gather construction,travel time calculation,and estimation of the geometrical dispersion factor,as well as the influence of the migration stretch to the common reflection angle gather datasets were studied.The trial calculation was conducted with the theoretical model data,2D field seismic data were used to validate the method,excellent results were achieved for imaging the steep structures.The studies results show that application of the common reflection angle gathers could better conduct the velocity modeling optimization and the AVA analysis.
