Overturned-Wave Migration by Two-Way Extrapolation
, by Zhiming Li, Jon F. Claerbout, and Richard A. Ottolini
Overturned waves are the reflections from the undersides of steeply dipping reflectors. Conventional depth migration usually treats them as evanescent waves and ignores them when downward continuing the wave field. To migration the overturned waves, the reverse time migration method based on the two-way non-reflecting wave equation was suggested by Baysal, Kosloff and Sherwood (1984). As an alternative approach to handle the same problem, a two-way extrapolation method to migrate the normal and the overturned reflections separately was recently proposed by Claerbout (1984).
The principle of Claerbout's two-way extrapolation method and some practical computation examples are discussed in this paper.
STANFORD