Article : Wavefield downward extrapolation for migration velocity analysis on Marmousi data-set
Authors : Teisseyre, R.Institute of Geophysics, Polish Academy of Sciences ul. Księcia Janusza 64, 01-452 Warszawa, Poland, firstname.lastname@example.org, Pilchin, A.N.Universal Geoscience and Environmental Consulting Company, 205 Hilda Ave., Willowdale, Ontario, M2M 4B1, Canada, email@example.com, Bubnov, V.P.North-West Ltd., Podolskih kursantov 24D, 117546 Moscow, Russia, firstname.lastname@example.org, Bojdys, G.Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland, email@example.com, Essa, K.S.Geophysics Department, Faculty of Science, Cairo University, Giza, Egypt, firstname.lastname@example.org, Pietsch, K.Department of Geophysics, Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland, email@example.com, Kostecki, A.Oil and Gas Institute, ul. Lubicz 25A, 31-503 Kraków, Poland, firstname.lastname@example.org,
Abstract : The authors present a method for estimation of interval velocities using the downward continuation of the wavefield to perform layer-stripping migration ve-locity analysis. The generalized, phase-shift migration MG(F-K) in wavenumber–frequency domain was used for fulltime downward extrapolation of the wavefield. Such downward depth extrapolation accounts for strong changes of velocity in lat-eral and vertical directions and helps in correct positioning of the wavefield image in complex structures. Determination of velocity is the recursive process which means that the wavefield on depth level zn-1 (n = 0, 1, …) is an input data-set for determination of velocity on level zn. The velocity v[x, zn – zn-1] can be thus treated as interval velocity Δzn=zn-zn-1 step. This method was tested on synthetic Marmousi data-set and showed satisfactory results for complex, inhomogeneous media.
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Qute : Teisseyre, R. ,Pilchin, A.N. ,Bubnov, V.P. ,Bojdys, G. ,Essa, K.S. ,Pietsch, K. ,Kostecki, A. ,Kostecki, A. , Wavefield downward extrapolation for migration velocity analysis on Marmousi data-set. Acta Geophysica Vol. 55, no. 2/2007