Beamlet migration based on local perturbation theory

Beamlet migration based on local perturbation theory is proposed. The method is formulated with a local bac kground velocity and local perturbations for each window of the wave field decomposition using Gabor- Daubechies frame and local cosine basis. The prop- agators and phase-correction operators are obtained analytically for the G-D tight-frame, and numerically for the local cosine basis. The numerical test using the SEG-EAEG salt model poststac k data demonstrates the great potential of this approach.