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1 Acta Geophysica

1 2007

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Wavefield downward extrapolation for migration velocity analysis on Marmousi data-set

Kostecki A., Półchłopek A.

Acta Geophysica

2007

Vol. 55, no. 2

209-221

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.