||Theory of 3-D angle gathers in wave-equation seismic imaging||
Up: Reproducible Documents
Published as Journal of Petroleum Exploration and Production Technology, 1, 11-16, (2011)
Theory of 3-D angle gathers in wave-equation seismic imaging
I present two methods for constructing angle gathers in 3-D seismic
imaging by downward extrapolation. Angles in angle gathers refer to
the scattering angle at the reflector and provide a natural access
to analyzing migration velocity and amplitudes. In the first method,
angle gathers are extracted at each downward-continuation step by
mapping transformations in constant-depth frequency slices. In the
second method, one extracts angle gathers after applying the imaging
condition by transforming local offset gathers in the depth domain.
The second approach generalizes previously published algorithms for
angle-gather construction in 2-D and common-azimuth imaging.