Structure-constrained plane-wave least-squares FFD prestack depth migration for VTI media
Zhu Feng1,2, Huang Jianping1,2, Li Zhenchun1,2, Li Qingyang1,2,3
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Laboratory of Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao, Shandong 266071, China; 3. Geophysical Exploration Research Institute, Zhongyuan Oilfield Branch Co., SINOPEC, Pu-yang, Henan 457001, China
Abstract:For most of the sedimentary strata in the central and eastern China,seismic wave velocity is determined by both the underground position and the spread direction.It is important to develop migration methods for anisotropic media to improve seismic imaging.With the high order Fourier finite difference (FFD) operator to the linear inversion imaging,we propose a VTI least-squares FFD prestack depth migration method (VTI-LSFFD).Based on the accomplishment of VTI-LSFFD,optimization strategies are adopted to solve some key problems of the least-squares migration such as heavy computation cost and sensitivity to coherent imaging noises.First,the plane-wave encoding strategy is used to reduce the amount of seismic data and improve computation efficiency.Then common imaging gathers (CIG) are extracted and plane-wave construction (PWC) operators are applied to the CIGs,the coherent imaging noise is suppressed and the signal-to-noise ratio (SNR) is improved.Based on our numerical experiments on the modified anisotropy Marmousi 2 model,the following advantages of the proposed method are found:this method is suitable for strong horizontal velocity variation; it has both high computation efficiency and low coherent imaging noises sensitivity; and with the plane-wave encoding strategy,it achieves better near-surface imaging than the one-way wave migration methods.
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