Finite-difference $\omega$-x migration of unregularized seismic data

Ioan Vlad

nick@sep.stanford.edu

ABSTRACT

Wavefield downward continuation does not need to be done on a structured spatial mesh. Semistructured meshes have advantages (no need for regularization before migration) but they sometimes produce artifacts. There are at least two acquisition settings which will not result in artifacts. The implementation is simple. I present a 2D zero-offset $\omega$-x semistructured mesh migration (SMM) of a synthetic dataset. Its outputs are compared with those of $\omega$-x migration on a regular grid, with zero traces inserted in the place of missing data. There are several potential ways of removing the artifacts. Extension to 3D is also possible.