FRACTURE CHARACTERIZATION FROM NEAR-OFFSET VSP INVERSION |
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| Authors: | Steve Horne Colin MacBeth J Queen W Rizer & V Cox |
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| Institution: | British Geological Survey, Murchison House, West Mains Road, Edinburgh, EH9 3LA, Scotland, UK; Department of Geology and Geophysics, Grant Institute, University of Edinburgh, West Mains Road, Edinburgh, EH9 3JW, Scotland, UK; Conoco Inc., Ponca City, OK 74603, USA |
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| Abstract: | 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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