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Migration in the angle-domain creates seismic images for different
reflection angles. This chapter presents a method for
computing angle-domain common image gathers from
seismic images obtained by depth migration using wavefield
extrapolation. This method operates on prestack
migrated images and produces the output as a function of the
reflection angle and not as a function of offset ray-parameter
as in other alternative approaches.
The method amounts to a
radial-trace transform in the Fourier domain and is
equivalent to a slant stack in the space domain. Thus, we obtain
angle gathers using a stretch technique that enables us to impose
smoothness through regularization. This
method is accurate, fast, robust, and easy to implement.
The main applications of this method are in the
migration velocity analysis and
amplitude versus angle analysis.
This chapter develops the angle gather transformation in 2D.

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Stanford Exploration Project

11/4/2004