Abstract

Velocity anisotropy calibration using Walkaway VSPs or sonic data has been shown to deliver net quality improvements in seismic imaging. Nevertheless, common industry workflows still do not take full advantage of all available data. In this study, advanced borehole sonic and Walkaway VSP data acquired in a single presalt vertical well were combined to estimate continuous depth profiles of Thomsen parameters. These parameters were successfully propagated away from the well in the surface seismic velocity model, in order to minimize the Walkaway transit time residuals.

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