贾晓峰
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摘要:One-way wave propagators have been used extensively in forward and inverse problems. The advantages of one-way wave propagators are the fast speed of computation and the large savings in computer resources. However, regular one-way wave propagators have inherent angle limitation to within 90° of the preferred direction (e.g., z-direction). We propose to overcome the limitation by a superwide-angle one-way method, which combines and interpolates two orthogonally propagated one-way wavefields in the 2D case. A weight function determined by the propagation angle is employed to combine the two one-way wavefields. In the current implementation, we use the wavefield gradient to estimate the propagation angle. Numerical experiments show that the proposed method has accurate superwide-angle (>90°) propagation and can model turning waves well. By applying the superwide-angle one-way wave propagator on several synthetic model data sets, we can demonstrate the validity of the method in imaging steep and overhanging salt flanks.
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上一条:Xiaofeng Jia and Ru-Shan Wu(*), 2009, Calculations of wavefield gradients and wave propagation angles in complex media: application to turning wave simulations, Geophysical Journal International, 178(3): 1565-1573.
下一条:Xiaofeng Jia, Runqiu Wang and Tianyue Hu(*), 2005, A meshless method for acoustic and elastic modeling, Applied Geophysics, 2(1): 1-6.