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Book Chapter

Inversion for Shear-Wave Splitting

By
Steve Horne
Steve Horne
1
Department of Geology and Geophysics, University of Edinburgh, West Mains Road, Edinburgh, UK. EH9 3JY
2
British Geological Survey, Murchison House, West Mains Road, Edinburgh, UK. EH9 3LA
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Colin MacBeth
Colin MacBeth
2
British Geological Survey, Murchison House, West Mains Road, Edinburgh, UK. EH9 3LA
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John Queen
John Queen
3
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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