MINIMUM-APERTURE KIRCHHOFF MIGRATIONBY MEANS OF CRS ATTRIBUTES

摘要

Efficiency of Kirchhoff migration as well as the achievable image quality depend strongly on themigration aperture. The use of small apertures speeds up migration with the drawback that steeply dippingreflectors cannot be imaged properly. By choosing larger apertures steep reflectors can be imaged. But asa consequence, run time increases and the steep migration operators can cause operator aliasing which hasto be suppressed by anti-alias filters. These filters slow down migration even more and often make a true-amplitudeprocessing impossible. Kinematic wavefield attributes determined with the Common-Reflection-Surfacestack allow to compute a minimum migration aperture for each point in the migration target zone.The application of minimum-aperture Kirchhoff pre- and poststack migration to a complex synthetic dataset demonstrates that this technique yields images of high quality with increased computational efficiency.