Cascaded One-Step 15-Degree Migration Versus Stolt Migration
, by Zhiming Li
Claerbout's new time-velocity (t prime , w ) wavefield extrapolation method
was introduced in his paper "Velocity Extrapolation by Cascaded 15 Degree Migration" (Claerbout, 1986). This paper attempted first to understand and relate Claerbout's method to Larner and Beasley's cascaded migration method
(Larner and Beasley, 1985) and then to compare results of applying the velocity-extrapolation method (or cascaded one-step migration method) and a Stolt method
to migrations of a field data set from the Gulf of Mexico.
The results of the field data migrations show that taking the number of depth step being one in cascaded 15-degree migration is as or more computationally efficient than Stolt migration when dips of reflections are moderate.
STANFORD