A comparison between anisotropic reverse time and phase-shift plus interpolation prestack migrations for tilted anisotropic media

Abstract

Two 2D anisotropic prestack depth migration algorithms that use wavefield extrapolation are evaluated for tilted transversely isotropic media (TTI). The first method is anisotropic phase-shift-plus-interpolation (A-PSPI) that is based on an analytical solution of frequency-dispersion enabling the use of an arbitrary distribution of velocities and anisotropic parameters. The second method is anisotropic reverse-time (A-RT) that uses the full wave equation. we evaluate the accuracy and efficiency of there algorithms. Examples are presented that use numerica and physically modelled data along with a structurally complex real data example. Both A-PSPI and A-RT have excellent performance with A-RT maintaining the advantage of using the full wave equation.