1887
Volume 42 Number 8
  • E-ISSN: 1365-2478

Abstract

Abstract

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.

Loading

Article metrics loading...

/content/journals/10.1111/j.1365-2478.1994.tb00249.x
2006-04-28
2024-03-29
Loading full text...

Full text loading...

References

  1. AlfordR.M.1986. Shear data in the presence of azimuthal anisotropy: Dilley, Texas. 56th SEG meeting, Houston, Expanded Abstracts, 476–479.
  2. ArtsR.J., HelbigK. and RasolofosaonP.N.J.1991. Complete inversion of the anisotropic elastic tensor in rocks: Experiment and theory. 61st SEG meeting, Houston, Expanded Abstracts, 1538–1541.
  3. BackusG.E.1962. Long‐wave elastic anisotropy produced by horizontal layering. Journal of Geophysical Research66, 4427–4440.
    [Google Scholar]
  4. ChapmanC.H. and PrattR.G.1992. Traveltime tomography in anisotropic media – I. Theory. Geophysical Journal International109, 1–19.
    [Google Scholar]
  5. CrampinS.1985. Evaluation of anisotropy by shear‐wave splitting. Geophysics50, 42–152.
    [Google Scholar]
  6. CrampinS.1987. Geological and industrial implications of extensive‐dilatancy anisotropy. Nature328, 491–496.
    [Google Scholar]
  7. DoumaJ.1988. The effect of the aspect ratio on crack‐induced anisotropy. Geophysical Prospecting36, 614–632.
    [Google Scholar]
  8. FolstadP.G. and SchoenbergM.1993. Scattering from a set of anisotropic layers to second order in frequency. 55th EAEG meeting, Stavanger, Norway, Expanded Abstracts, p. 105.
  9. GoldbergD.E.1898. Genetic Algorithms in Search Optimization and Machine Learning. Addison‐Wesley Pub. Co.
    [Google Scholar]
  10. HudsonJ.A.1986. A higher order approximation to the wave propagation constants for a cracked solid. Geophysical Journal of the Royal astronomical Society87, 265–274.
    [Google Scholar]
  11. HudsonJ.A., 1991. Crack distributions which account for a given seismic anisotropy. Geophysical Journal International104, 517–521.
    [Google Scholar]
  12. LiX.Y. and CrampinS.1993. Linear‐transform techniques for processing shear‐wave anisotropy in four‐component seismic data. Geophysics58, 240–256.
    [Google Scholar]
  13. LiuE. and CrampinS.1990. Effects of the internal shear‐wave window: comparison with anisotropy induced splitting. Journal of Geophysical Research95, 11275–11281.
    [Google Scholar]
  14. LiuE., CrampinS. and QueenJ.H.1991. Fracture detection using cross‐hole surveys and reverse vertical seismic profiles at the Conoco Borehole Test Facility, Oklahoma. Geophysical Journal International107, 449–463.
    [Google Scholar]
  15. MacBethC.1991. Inverting shear‐wave polarizations for anisotropy using three component offset VSP's: synthetic seismograms. Geophysical Journal International107, 571–583.
    [Google Scholar]
  16. MusgraveM.J.1970. Crystal Acoustics. Holden‐Day Inc.
    [Google Scholar]
  17. QueenJ.H. and RizerW.D.1990. An integrated study of seismic anisotropy and the natural fracture system at the Conoco Borehole Test Facility, Kay County, Oklahoma. Journal of Geophysical Research95, 11255–11273.
    [Google Scholar]
  18. SambridgeM. and DrijkoningenG.1992. Genetic algorithms in seismic waveform inversion. Geophysical Journal International109, 323–342.
    [Google Scholar]
  19. SmithM.L., ScalesJ.A. and FischerT.L.1992. Global search and genetic algorithms. The Leading Edge of Exploration11, 22–26.
    [Google Scholar]
  20. StoffaP.L. and SenM.K.1991. Nonlinear multiparameter optimization using genetic algorithms: inversion of plane wave seismograms. Geophysics56, 1794–1810.
    [Google Scholar]
  21. TathamR.B. and McCormackM.D.1991. Multicomponent seismology in petroleum exploration. In: Investigations in Geophysics, No. 6. (eds). E.B.Neitzel and D.F.Winterstein SEG.
    [Google Scholar]
  22. TaylorD.B.1990. aniseis manual: version 4.5: Applied Geophysical Software Inc., Houston .
    [Google Scholar]
  23. ThomsenL.1986. Weak elastic anisotropy. Geophysics51, 1954–1966.
    [Google Scholar]
  24. ZengX. and MacBethC.1993. Algebraic processing techniques theory. Geophysical Prospecting41, 1033–1066.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/journals/10.1111/j.1365-2478.1994.tb00249.x
Loading
  • Article Type: Research Article

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error