LI Shengya1,2, LYU Qingda1,2, HUANG Jianping1,2, LI Zhenchun1,2, HU Ziduo3, LIU Dingjin4
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao, Shandong 266580, China; 3. Northwest Branch, Research Insititute of Petroleum Exploration and Development, PetroChina, Lanzhou, Gansu 730022, China; 4. SINOPEC Geophysical Research Insititute, Nanjing, Jiangsu 211103, China
Abstract:Adaptive focused beam is an improvement of Gaussian beam.Considering the affection of local velocity field on beam width,it focuses multiple times to control the effective energy of seismic beam within one wavelength.Different from Gaussian beam,adaptive focused beam selects initial beam parameters dynamically.For adaptive focused beam is advantageous in dealing with the i-maging problem in the media with strong horizontal velocity variation,the adaptive focused beam migration method was applied to VTI media in this paper.Based on the anisotropic ray tracing equation system represented by classical elastic parameters,the adaptive focused beam migration in VTI media was realized.The comparison between the beam shape of traditional Gaussian beam and that of adaptive focused beam revealed the advantage of adaptive focused beam in beam shape control.Sub-Sag model test demonstrared the accuracy and stablity of adaptive focused beam migration method in anisotropic media.Anisotropic SEG/Hess model test demonstrated the feasibility of the method proposed in this paper on complex geological model.The application in real data processing demonstrated that the imaging effect of the method proposed in this paper is better than conventional Gaussian beam migration methods in anisotropic media.
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