Angle-dependent reflectivity from elastic reverse-time migration

Carlos A. Cunha Filho

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ABSTRACT

Any amplitude-based lithologic inversion method must compensate for all changes in the amplitudes that are not directly related to the properties to be estimated. Conventional methods for compensation of geometrical spreading and transmission/conversion losses are not applicable when the subsurface structures cannot be well approximated by horizontal layers. Migration-based methods have been proposed recently as a solution for correctly retrieving angle dependent reflectivity in the presence of complex structures. I this paper I describe here an anisotropic prestack reverse migration scheme for retrieving the P-P reflectivity as a function of the local Snell parameter. The paper shows that this functionality represents a more appropriate way of expressing the directional dependence of the reflection coefficient than the more usual angular function.