CONVERTED WAVE REVERSE TIME MIGRATION WITH GAUSSIAN BEAMS IN VTI MEDIA

摘要

With the development of seismic data acquisition technology, more and more multi-component seismic data are being acquired. Owing to the slow propagation velocity and wide propagation angle, the converted PS-wave contains more accurate subsurface information, which make it play an important role in multi-component seismic exploration. Compared with the P-wave, the converted PS-wave is more sensitive to the anisotropy, which cannot be neglected during the seismic migration. Reverse time migration with Gaussian beams combines the high calculation efficiency of Gaussian beam migration and the high imaging accuracy of reverse time migration, which can be used for the converted PS-wave imaging. In this paper, we derive the converted PS-wave ray tracing equations based on phase velocity and present the imaging condition of converted PS-wave, then we propose a converted wave reverse time migration with Gaussian beams method for VTI media. The numerical tests on anisotropic models demonstrate the effectiveness and applicability of the proposed method.