A global optimization method incorporating a ray‐tracing scheme is used to invert observations of shear‐wave splitting from two near‐offset VSPs recorded at the Conoco Borehole Test Facility, Kay County, Oklahoma. Inversion results suggest that the seismic anisotropy is due to a non‐vertical fracture system. This interpretation is constrained by the VSP acquisition geometry for which two sources are employed along near diametrically opposite azimuths about the well heads. A correlation is noted between the time‐delay variations between the fast and slow split shear waves and the sandstone formations.
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Horne et al. (1997) studied this question.
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