An Efficient Least–Squares Migration

P178 An Efficient Least–Squares Migration R.J. Leggott* (CGGVeritas) R. Wombell (CGGVeritas) G. Conroy (CGGVeritas) T. Noss (CGGVeritas) & G. Williams (CGGVeritas) SUMMARY Seismic migration was originally devised for converting a recorded seismic dip into geological dip. These days migration is also expected to provide the correct amplitudes (reflectivity) as well as accurately positioned reflections. Modern migration algorithms usually achieve this with marine streamer data where there is good spatial sampling. For OBS and onshore seismic data however migrated images often exhibit “acquisition footprints” which prevent accurate analysis and interpretation. The operator required for migration algorithms to form an accurate image