1887

Abstract

Summary

The paper proposes an approach to multidimensional geometric (parametric) inversion of the airborne EM data in the time-domain in the presence of the conductive lateral overburden inhomogenities with the significant altitude variations of the surface relief and subhorizontal surfaces between the layers of the geological medium. The solution of forward problems and calculation of the impact field of the geoelectrical model parameters are performed with the use of the finite element method. The possibilities of the proposed approach are shown on synthetic data for the multilayer geoelectrical model containing the target objects with the different geometry: a subvertical object and an object with the tube form, beneath a conductive lateral inhomogeneous overburden in the condition of the significant altitude variations of the surface relief. The geoelectrical model was constructed as a generalization on the basis of the results of the airborne EM data interpretation obtained in several areas. The results of the numerical experiments show that the proposed approach makes it possible to detect and delineate the target objects in the case of a relatively low impact from these objects to the receiving signals in comparison to other 3D-inhomogenities including the ones overlapping the target objects.

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/content/papers/10.3997/2214-4609.201800541
2018-04-23
2024-03-28
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References

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    https://doi.org/10.1190/geo2015-0481.1. [Google Scholar]
  15. McMillanMichael S., OldenburgDouglas W., HaberEldad, and SchwarzbachChristoph
    [2015] Parametric 3D inversion of airborne time domain electromagnetics. 24th International Geophysical Conference and Exhibition. ASEG Extended Abstracts 2015: pp. 1–5. doi: 10.1071/ASEG2015ab101.
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    https://doi.org/10.1190/geo2012-0131.1. [Google Scholar]
  17. Persova, M.G., Soloveichik, Y.G., Vagin, D.V., Domnikov, P.A., Tokareva, M.G.
    [2012] Solution of scientific and industrial electrical prospecting problems on distributed computational systems. Geobaikal 2012 - 2nd International Research and Application Conference on Electromagnetic Research Methods and Integrated Geophysical Data Interpretation. Extended Abstracts, S6. doi: 10.3997/2214‑4609.20143541.
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    [Google Scholar]
  19. Persova, M.G., Soloveichik, Y.G., Trigubovich, G.M., Vagin, D.V., Domnikov, P.A.
    [2014b] Transient electromagnetic modelling of an isolated wire loop over a conductive medium. Geophysical Prospecting,62 (5), 1193–1201. doi: 10.1111/1365‑2478.12122.
    https://doi.org/10.1111/1365-2478.12122. [Google Scholar]
  20. Persova, M.G., Soloveichik, Y.G., Koshkina, Y.I., Vagin, D.V., Trubacheva, O. S.
    [2016]. Geometrical Nonlinear 3D Inversion of Airborne Time Domain EM Data. In Near Surface Geoscience 2016-First Conference on Geophysics for Mineral Exploration and Mining. Extended abstract. doi: 10.3997/2214‑4609.201602114
    https://doi.org/10.3997/2214-4609.201602114 [Google Scholar]
  21. Soloveichik, Yu.G., Persova, M.G., Domnikov, P.A., Koshkina, Yu.I., Vagin, D.V.
    [2018] Finite element solution to multidimensional multisource electromagnetic problems in the frequency domain using non-conforming meshes. Geophysical Journal International,212 (3), 2159–2193. doi: 10.1093/gji/ggx530.
    https://doi.org/10.1093/gji/ggx530. [Google Scholar]
  22. Yang, D., Oldenburg, D.W., Haber, E.
    [2014] 3-D inversion of airborne electromagnetic data parallelized and accelerated by local mesh and adaptive soundings. Geophysical Journal International,196 (3), 1492–1507. doi: 10.1093/gji/ggt465.
    https://doi.org/10.1093/gji/ggt465. [Google Scholar]
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