GAUSSIAN-BEAM MIGRATION

This paper describes a zero-offset depth migration method that employs Gaussian beam downward continuation of the recorded wave field. The Gaussian-beam migration method has advantages for imaging complex structures. Like finite-difference migration, it is especially compatible with lateral variations in velocity, but Gaussian beam migration can image steeply dipping reflectors and will not produce unwanted reflections from structure in the velocity model. Unlike other raypath methods. Gaussian beam migration has guaranteed regular behavior at caustics and shadows. In addition, the method determines the beam spacing that ensures efficient, accurate calculations. The images produced by Gaussian beam migration are usually stable with respect to changes in beam parameters. -from Author