A great challenge facing explorationists is identification of potential intervals of reservoir quality sand in areas with little well control. This is especially acute in deep water where reservoir presence can be elusive and well costs are considerable.

Substantial evidence suggests the occurrence of transversely isotropic (TI) anisotropy in the subsurface associated primarily with shales, while intervals of clastic material show greatly reduced and/or near-zero TI anisotropy. Although this has been demonstrated conclusively on core samples, the need exists to translate these concepts into a geologic framework on a basinwide and prospect scale. This article presents a method for estimating...

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