Inversion for seismic anisotropy using genetic algorithms

Journal Article · Tue Nov 01 04:00:00 EST 1994 · Geophysical Prospecting; (United States)

DOI:https://doi.org/10.1111/j.1365-2478.1994.tb00249.x· OSTI ID:6917998

Horne, S ^[1]; MacBeth, C ^[2]

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1. British Geological Survey, Edinburgh (United Kingdom) Univ. of Edinburgh (United Kingdom). Dept. of Geology and Geophysics
2. Univ. of Edinburgh (United Kingdom). Dept. of Geology and Geophysics

A general inversion scheme based on a genetic algorithm is developed to invert seismic observations for anisotropic parameters. The technique is applied to the inversion of shear-wave observations from two azimuthal VSP data sets from the Conoco test site in Oklahoma. Horizontal polarizations and time-delays are inverted for hexagonal and orthorhombic symmetries. The model solutions are consistent with previous studies using trial and error matching of full waveform synthetics. The shear-wave splitting observations suggest the presence of a shear-wave line singularity and are consistent with a dipping fracture system which is known to exist at the test site. Application of the inversion scheme prior to full waveform modeling demonstrates that a considerable saving in time is possible while retaining the same degree of accuracy.

• OSTI ID: 6917998
• Journal Information: Geophysical Prospecting; (United States), Journal Name: Geophysical Prospecting; (United States) Vol. 42:8; ISSN GPPRAR; ISSN 0016-8025
• Country of Publication: United States
• Language: English

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