Iterative estimation of depth migration operators

Robert G. Clapp and Biondo Biondi

bob@sep.stanford.edu, biondo@sep.stanford.edu

ABSTRACT

We divide the velocity estimation problem into two steps: focusing operator estimation and back projection to the velocity field. We propose estimating perturbations in the focusing operators by analyzing homothetic scans of the travel-time field. In the case of systematic bias in the velocity model, the correct perturbations to the focusing operator are indicated by the homothetic scans.