P271 Wide Angle FD and FFD Migration Using Complex Padé Approximations D. Amazonas (UFPa) J.C. Costa* (UFPa) R. Pestana (UFBa) & J. Schleicher (Campinas State University (Unicamp)) SUMMARY Seismic migration by downward continuation using the one-way wave equation approximations has two shortcomings: imaging steep dip reflectors and handling evanescent waves. Complex Padé approximations allow a better treatment of evanescent modes stabilizing finite-difference migration without requiring special treatment for the migration domain boundaries. Imaging steep dip reflectors can be improved using several terms in the Padé expansion. We discuss the implementation and evaluation of wide-angle complex Padé approximations for finite-difference and


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