Pre-stack AVO Inversion

Pre-stack AVO Inversion

What elastic information can be extracted from an ideal AVO data set? Tested on a North Sea greensand reservoir model

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An inversion method based on rejection sampling is developed, with the objective of obtaining posterior distributions of the P-wave velocity, S-wave velocity and density. The inversion algorithm is based on the exact expression of the reflection coefficient from the Zoeppritz equation. The results of inverting directly on the reflection coefficient is compared with inversion algorithms based on the two- and three term Taylor approximation to the Zoeppritz equation, allowing larger contrasts across the reflecting interface. At first, the inversions are compared for a broad limited prior model a...