Imaging steeply dipping reflectors in TI media by wavefield extrapolation

Guojian Shan and Biondo Biondi

shan@sep.stanford.edu, biondo@sep.stanford.edu

ABSTRACT

We develop an anisotropic plane-wave migration method based on wavefield extrapolation. In this new scheme, we decompose both source and receiver wavefields into plane waves by delaying shots. For each plane wave, we design a tilted coordinate system whose tilting angle depends on the propagation direction of the plane wave. The wavefield extrapolation is done by an implicit isotropic operator plus an explicit anisotropic correction operator. We apply this method on a synthetic dataset. The results show that our scheme can accurately handle overturned waves and image steeply dipping reflectors in transversely isotropic media with a vertical axis of symmetry (VTI).