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Abstract

Summary

The principle of equivalence is known to cause non-uniqueness in interpretations of direct current (DC) resistivity data. Here, we show that these equivalences can be significantly reduced by combining DC data with time-domain induced polarization (IP) measurements. An understanding of model equivalences requires a comprehensive investigation for each model when using gradient-based inversion methods. Instead, we apply a 1D Monte Carlo inversion that makes it possible to investigate the space of equivalent models. We invert synthetic DC data of a model with low-resistivity equivalences. We then include a contrast in chargeability, modelled in terms of spectral Cole-Cole IP parameters, and invert the DC and IP data together. The results show that the inclusion of IP data resolves the equivalences. The degree of resolution depends on the contrast in the chargeability and/or the other IP parameters. The contrasts required are easily expected in the field, which is justified with a field example where DC and IP data are measured on a sand formation with an embedded clay layer. Inversion results show that the resistivity data alone does not resolve the clay layer due to equivalence problems, but by adding the IP data to the inversion, the layer is resolved.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.201702032
2017-09-03
2024-04-19

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References

  1. Cole, K.S. & Cole, R.H.
    [1941]. Dispersion and absorption in dielectrics. Journal of Chemical Physics9, 341–351.
     [Google Scholar]
  2. Fiandaca, G., Auken, E., Gazoty, A. & Christiansen, A. V.
    [2012]. Time-domain induced polarization: Full-decay forward modeling and 1D laterally constrained inversion of Cole-Cole parameters. Geophysics77, E213–E225.
     [Google Scholar]
  3. Fiandaca, G., Ramm, J., Binley, A., Gazoty, A., Christiansen, A.V. & Auken, E.
    [2013]. Resolving spectral information from time domain induced polarization data through 2-D inversion. Geophysical Journal International192, 631–646.
     [Google Scholar]
  4. Fitterman, D.V., Meekes, J. a. C. & Ritsema, I.L.
    [1988]. Equivalence behavior of three electrical sounding methods as applied to hydrogeological problems. 1988. EAGE.
     [Google Scholar]
  5. Gazoty, A., Fiandaca, G., Pedersen, J., Auken, E. & Christiansen, A.V.
    [2013]. Data repeatability and acquisition techniques for Time-Domain spectral Induced Polarization. Near Surface Geophysics11, 391–406.
     [Google Scholar]
  6. Gazoty, A., Fiandaca, G., Pedersen, J., Auken, E., Christiansen, A.V. & Pedersen, J.K.
    [2012]. Application of time domain induced polarization to the mapping of lithotypes in a landfill site. HESS16, 1793–1804.
     [Google Scholar]
  7. Koefoed, O.
    [1979]. Geosounding principles, 1. Resistivity Sounding Measurements Elsevier.
     [Google Scholar]
  8. Madsen, L.M., Kirkegaard, C., Fiandaca, G., Christiansen, A.V. & Auken, E.
    [2016] An analysis og Cole-Cole parameters for IP data using Markov chain Monte Carlo. IP2016/4th International Workshop on Induced Polarization6.–8. June 2016 2016 Aarhus, Denmark.
     [Google Scholar]
  9. Olsson, P.I., Dahlin, T., Fiandaca, G. & Auken, E.
    [2015]. Measuring time-domain spectral induced polarization in the on-time:decreasing acquisition time and increasing signal-to-noise ratio. Journal of Applied Geophysics, 2015, 6.
     [Google Scholar]
  10. Pelton, W.H., Ward, S.H., Hallof, P.G., Sill, W.R. & Nelson, P.H.
    [1978]. Mineral discrimination and removal of inductive coupling with multifrequency IP. Geophysics43, 588–609.
     [Google Scholar]
  11. Raiche, A.P., Jupp, D.L.B., Rutter, H. & Vozoff, K.
    [1985]. The joint use of coincident loop transient electromagnetic and Schlumberger sounding to resolve layered structures. Geophysics50, 1618–1627.
     [Google Scholar]
  12. Sandberg, S.K.
    [1993]. Examples of resolution improvement in geoelectrical soundings appplied to groundwater investigations. Geophysical Prospecting41, 207–227.
     [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201702032
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Resolution of DC Resistivity-thickness Equivalences by Inclusion of Induced Polarization Data
Conference Proceedings 2017, 1 (2017); https://doi.org/10.3997/2214-4609.201702032
/content/papers/10.3997/2214-4609.201702032
/content/papers/10.3997/2214-4609.201702032
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