1887

Abstract

Summary

Electrical (E) and Electromagnetic (EM) geophysical methods have different sensitivities to the electrical properties, their anisotropy and spectral dispersion. In this work, we presented a novel inversion scheme for the joint inversion of electrical and electromagnetic (E&EM) datasets with modelling of induced polarization and 3D EM kernel. The approach integrates the system transfer function within a unified data space and introduces key features for balancing the joint inversion, with the disentanglement of model and forward meshes. We applied this joint inversion scheme to a mineral exploration survey carried out in Portugal within the SEMACRET Horizon Europe project. The comparison with independent modelling results revealed enhanced resolution of the joint models, and a unique IP parameterization accounted for both galvanic and inductive data. We believe that the E&EM joint inversion developed and applied in this study represents a breakthrough in the state of the art of galvanic and inductive investigations, pushing a significant step forward in mineral exploration.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.202520255
2025-09-07
2026-02-07
Loading full text...

Full text loading...

References

  1. Chen, J.; Dauti, F.; Zhang, B.; Fiandaca, G, 2025. Three dimensional AEM-IP inversion for mineral exploration in the SEMACRET project. In NSG 2025 31st European Meeting of Environmental and Engineering Geophysics, 1, 1–5. European Association of Geoscientists & Engineers.
    [Google Scholar]
  2. Christensen, N.B., 2000. Difficulties in determining electrical anisotropy in subsurface investigations. Geophysical Prospecting. 48(1), 1–19.
    [Google Scholar]
  3. Christiansen, A.V., Auken, E., Foged, N., Sørensen, K.I., 2007. Mutually and laterally constrained inversion of CVES and TEM data: a case study. Near Surface Geophysics5, 115–123. https://doi.org/10.3997/1873-0604.2006023
    [Google Scholar]
  4. Fiandaca, G., Chen, J., Zhang, B., 2024. EEMverter, a New Modelling Tool for Electric and Electromagnetic Data with Focus on Induced Polarization, in:NSG 2024 30th European Meeting of Environmental and Engineering Geophysics, Helsinki, Finland, pp. 1–5. https://doi.org/10.3997/2214-4609.202420166.
    [Google Scholar]
  5. 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. Geophys. J. Int., 192, 631–646. https://doi.org/10.1093/gji/ggs060.
    [Google Scholar]
  6. FiandacaG., Meldgaard MadsenL., MauryaP.K., 2018. Re-parameterisations of the Cole-Cole model for improved spectral inversion of induced polarization data, Near Surface Geophysics, 16 (4), 385–399. https://doi.org/10.3997/1873-0604.2017065
    [Google Scholar]
  7. JesusA.P., MateusA., MunháJ. M., TassinariC., 2014. Internal architecture and Fe–Ti–V oxide ore genesis in a Variscan synorogenic layered mafic intrusion, the Beja Layered Gabbroic Sequence (Portugal), Lithos, Volumes 190–191, Pages 111–136, ISSN 0024-4937, https://doi.org/10.1016/j.lithos.2013.12.001.
    [Google Scholar]
  8. Madsen, L.M., Fiandaca, G., Auken, E., 2020. 3-D time-domain spectral inversion of resistivity and full-decay induced polarization data—full solution of Poisson's equation and modelling of the current waveform. Geophysical Journal International223, 2101–2116. https://doi.org/10.1093/gji/ggaa443
    [Google Scholar]
  9. OlssonP.-I., FiandacaG., LarsenJ.J., DahlinT. & AukenE., 2016. Doubling the spectrum of time-domain induced polarization by harmonic de-noising, drift correction, spike removal, tapered gating and data uncertainty estimation, Geophysical Journal International, 207 (2), 774–784. https://doi.org/10.1093/gji/ggw260
    [Google Scholar]
  10. SignoraA., GalliS., DautiF., ChenJ., MundayT., FiandacaG., 2025. Joint inversion of Electrical and Electromagnetic data – Part I: unprecedented resolution improvements. In NSG 2025 31st European Meeting of Environmental and Engineering Geophysics, 1, 1–5. European Association of Geoscientists & Engineers.
    [Google Scholar]
  11. Sullivan, N. A. L., Viezzoli, A., Fiandaca, G., 2024. EEMstudio: process and model electric and electromagnetic data with a QGIS plugin. In NSG 2024 30th European Meeting of Environmental and Engineering Geophysics, 1, 1–5. European Association of Geoscientists & Engineers.
    [Google Scholar]
  12. Weller, A., Seichter, M., Kampke, A., 1996. Induced-polarization modelling using complex electrical conductivities. Geophysical Journal International127, 387–398. https://doi.org/10.1111/j.1365-246X.1996.tb04728.x.
    [Google Scholar]
/content/papers/10.3997/2214-4609.202520255
Loading
/content/papers/10.3997/2214-4609.202520255
Loading

Data & Media loading...

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