Converted-Wave Imaging in Inhomogeneous, Anisotropic Media - Part II - Prestack Migration

P114 CONVERTED-WAVE IMAGING IN INHOMOGENEOUS ANISOTROPIC MEDIA – PART II – PRESTACK MIGRATION Summary 1 We assume a scatter point located beneath a stack of layers with vertical transverse isotropy (VTI) and derive an accurate double-square-root (DSR) C-wave diffraction equation. We demonstrate how this DSR equation can be incorporated into the Kirchhoff prestack time migration. The DSR equation is accurate for long offsets and is controlled by five parameters: P- and S-wave stacking velocities VP2 and VS2 vertical velocity ratio γ0 and anisotropic parameters ηeff and ζeff. These parameters can be inverted from the four C-wave moveout attributes (VC2 γ0