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Split-step complex Padé-Fourier depth migration |
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| Authors: | Linbin Zhang James W Rector III G Michael Hoversten Sergey Fomel |
| Institution: | Department of Material Science and Engineering, University of California, Berkeley, CA 94720, USA. E-mail:; One Cyclotron Road, Lawrence Berkeley National Laboratory, MS 90-1116, Berkeley, CA 94720, USA;Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA;Bureau of Economic Geology, The University of Texas at Austin, University Station, Box X, Austin, TX 78713-8972, USA |
| Abstract: | We present a split-step complex Padé-Fourier migration method based on the one-way wave equation. The downward-continuation operator is split into two downward-continuation operators: one operator is a phase-shift operator and the other operator is a finite-difference operator. A complex treatment of the propagation operator is applied to mitigate inaccuracies and instabilities due to evanescent waves. It produces high-quality images of complex structures with fewer numerical artefacts than those obtained using a real approximation of a square-root operator in the one-way wave equation. Tests on zero-offset data from the SEG/EAGE salt data show that the method improves the image quality at the cost of an additional 10 per cent computational time compared to the conventional Fourier finite-difference method. |
| Keywords: | depth migration Fourier finite-difference method Padé approximation |