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Book Chapter

Inversion for Shear-Wave Splitting

By
Steve Horne
Steve Horne
Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh, UK. EH9 3JYBritish Geological Survey, Murchison House, West Mains Road, Edinburgh, UK. EH9 3LA
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Colin MacBeth
Colin MacBeth
British Geological Survey, Murchison House, West Mains Road, Edinburgh, UK. EH9 3LA
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John Queen
John Queen
Exploration Research and Services, Conoco Inc., PO Box 1267, Ponca City, OK 74603, USA.
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Published:
January 01, 1996

Abstract

A global optimization technique based on a Genetic Algorithm is applied to the problem of inverting shear-wave splitting estimates from an Azimuthal VSP experiment recorded at the Conoco Borehole Test Facility, Oklahoma. The optimal model derived from the inversion is in excellent agreement with a-priori measurements. The inversion results indicate that the shear-wave splitting observations can be interpreted in terms of a dipping fracture set or an orthorhombic structure constructed from a vertical fracture set embedded in a equivalent anisotropic fine layering medium. Resolution of this non-uniqueness cannot be achieved with the available data, however with an appropriate acquisition geometry these two solutions may be differentiated.

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Contents

Seismic Anisotropy

Erling Fjær
Erling Fjær
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Rune M. Holt
Rune M. Holt
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Jaswant S. Rathore
Jaswant S. Rathore
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Society of Exploration Geophysicists
ISBN electronic:
9781560802693
Publication date:
January 01, 1996

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