1887

Abstract

Summary

Multidimensional inversions for electromagnetic (EM) data require regularization for stabilization. A common approach is to add some smoothness criterion, which provides stable results. The downside is that any feature will be uniformly blurred and tend to not appear geologically meaningful.

We present a 3D inversion algorithm for all types of airborne EM data featuring geo-steering. This additional regularization - based on a cross-gradient concept - is used to introduce assumed or known geological structures to the inversion. Using the additional information results in geologically more plausible models and increases the effective resolution of the inversion.

The approach is demonstrated with frequency domain field data set collected in rugged topography.

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/content/papers/10.3997/2214-4609.201413864
2015-09-06
2024-03-29
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References

  1. CommerM.
    [2003] Three-dimensional inversion of transient electromagnetic data: A comparative study. Mitteilungen aus dem Institut für Geophysik und Meteorologie der Universitaet zu Köln, 157.
    [Google Scholar]
  2. CommerM. and NewmanG.A.
    [2008] New advances in three-dimensional controlled-source electromagnetic inversion. Geophys. J. Int., 172, 513–535.
    [Google Scholar]
  3. Cox, L.H., Wilson, G.A. and Zhdanov, M.S.
    [2012] 3D inversion of airborne electromagnetic data. Geophysics, 77(4), WB59–WB69.
    [Google Scholar]
  4. Druskin, V. and Knizhnerman, L.
    [1994] Spectral approach to solving three-dimensional Maxwell’s diffusion equations in the time in the time and frequency domain. Radio Science, 29, 937–953.
    [Google Scholar]
  5. Gallardo, L.A. and Meju, M.A.
    [2003] Characterization of heterogeneous near-surface materials by joint 2D inversion of dc resistivity and seismic data. Geophys. Res. Lett., 30, 1658.
    [Google Scholar]
  6. Fraser, D.C.
    [1972] A new multicoil aerial electromagnetic prospecting system. Geophysics, 37, 518–537.
    [Google Scholar]
  7. Hördt, A.
    [1992] Interpretation transient elektromagnetischer Tiefensondierungen für anisotropy horizontal geschichtete und für dreidimensionale Leitfähigkeitstrukturen. Mitteilungen aus dem Institut für Geophysik und Meteorologie der Universitaet zu Köln, 86.
    [Google Scholar]
  8. Mulder, W.A.
    [2006] A multigrid solver for 3D electromagnetic diffusion, Geophys. Prosp, 54, 633–649.
    [Google Scholar]
  9. Plessix, R.-E. and Mulder, W.A.
    [2008] Resistivity imaging with controlled-source electromagnetic data: depth and data weighting. Inverse Problems, 24, doi: 10.1088/0266‑5611/24/3/034012.
    https://doi.org/10.1088/0266-5611/24/3/034012 [Google Scholar]
  10. Roos, P., Burgess, H. and Ward, I.
    [2007] Updated Mineral Resource And Reserve Estimate, Cerro De Maimón Project, Msnr. Nouel Province, Dominican Republic. Technical Report NI 43-101 for GlobeStar Mining Corporation.
    [Google Scholar]
  11. SchollC., R.Martin, O.Koch, S. L.Helwig, B.Tezkan, DESERT research group
    [2004] 2.5-D inversion of transient electromagnetic data. Abstracts of the 17th International Workshop on Electromagnetic Induction in the Earth, Hyderabad, India.
    [Google Scholar]
  12. SchollC. and Sinkevich, V.A.
    [2012] Modeling mCSEM data with a finite difference approach and an unstructured model grid in the presence of bathymetry. Abstracts of the 21st EM Induction Workshop, Darwin, Australia.
    [Google Scholar]
  13. Smith, R. and Hodges, G.
    [2008] The HeliGEOTEMsystem, with an example of data from the Maimon deposit in the Dominican Republic. Proceedings of AEM2008 - 5th International Conference on Airborne Electromagnetic, Finland28–30 May 2008.
    [Google Scholar]
  14. Vallée, M. and R.Smith
    [2007] Comparison of fixed-wing airborne electromagnetic 1D inversion methods. Proceedings of Exploration 07: 5th Decennial International Conference on Mineral Exploration, 1067–1072.
    [Google Scholar]
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