3D TTI RTM using the pseudo‐analytic method

Abstract

We use an extension of the pseudo-spectral method, called the pseudo-analytic method, to formulate a 3D TTI reverse time migration scheme. The pseudo-analytic method provides accurate, nearly non-dispersive wave propagation with a simple 2-order time-stepping scheme. The formulation is easily adapted to describe scalar wave propagation in VTI and TTI media. Our efficient TTI RTM scheme is free of the pseudo-shear wave artifacts that are normally associated with VTI and TTI formulations. We show 2D synthetic and 3D field data examples to illustrate the high-quality images that pseudo-analytic RTM produces.