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Inversion for seismic anisotropy using genetic algorithms Normal access

Authors: Steve Horne and Colin MacBeth
Journal name: Geophysical Prospecting
Issue: Vol 42, No 8, November 1994 pp. 953 - 974
DOI: 10.1111/j.1365-2478.1994.tb00249.x
Organisations: Wiley
Language: English
Info: Article, PDF ( 1.04Mb )

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 modelling demonstrates that a considerable saving in time is possible whilst retaining the same degree of accuracy.

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