Abstract
Summary Migration with data acquired on surface with irregular topography can be extrapolated from the highest surface based on one-way wavefield propagator. We fill with near surface velocity the area between the highest surface level and the irregular surface. At every depth, the corresponding seismic data are added if receivers or source exist. We use the local-cosine-bases (LCB) beamlet propagator which improves the image quality at the near irregular surface area because of its windowed reference velocity. We apply the local exponential frame (LEF) decomposition to obtain the image and amplitude correction factor in local wavenumber domain and then transform them into local angle domain after all the shot summation. The influence of irregular topography has been eliminated during the continuation process. We test our method with Model94 which has the highest elevation nearly 1800 meters. Compare with the imaging results without aperture correction or with Auto-vertical gain control (AGC), it has significant improvement in image quality, especially, the deep area with weak illumination.
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