Actas de congresos
Wide Angle Fd And Ffd Migration Using Complex Padé Approximations
Registro en:
9781605601557
69th European Association Of Geoscientists And Engineers Conference And Exhibition 2007: Securing The Future. Incorporating Spe Europec 2007. Society Of Petroleum Engineers, v. 5, n. , p. 3041 - 3045, 2007.
2-s2.0-55549120929
Autor
Amazonas D.
Costa J.C.
Pestana R.
Schleicher J.
Institución
Resumen
Seismic migration by downward continuation using the one-way wave equation approximations has two shortcomings: imaging steep dip reflectors and handling evanescent waves. Complex Fade 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 Fade approximations for finite-difference and Fourier finite-difference migration methods. The dispersion relation and the impulsive response of the migration operator provide criteria to select the number of terms and coefficients in the Fade expansion. This assures stability for a prescribed maximum propagation direction. The implementations are validated on the Marmousi model dataset and SEG/EAGE salt model data. 5
3041 3045 Bamberger, A., Engquist, L.H., Joly, P., Higher order paraxial wave equation approximations in heterogeneous media (1988) J. Appl. Math, 48, pp. 129-154 Biondi, B., Stable wide-angle fourier finite-difference downward extrapolation of 3-D wavefields (2002) Geophys, 67, pp. 872-882 Gazdag, J., Wave equation migration with the phase-shift method (1978) Geophys, 73, pp. 1342-1351 Millinazzo, F.A., Zala, C.A., Brooke, G.H., Square-root approximations for parabolic equation algorithms (1997) J. Acoust. Soc. Am, 101, pp. 760-766 Ristow, D., Kühl, T., Fourier finite-difference migration (1994) Geophys, 59, pp. 1882-1893 Zhang, L., Rector, J.W., Hoversten, G.M., Split-step complex padé migration. (2003) J. of Seism. Expl, 12, pp. 229-236