Full-waveform Inversion of GPR and ER Data with the Envelope Transform and Cross-gradients
Abstract
Full-waveform (FWI) inversion of GPR data is an emerging technique for enhancing the resolution of the recovered material properties of the subsurface. GPR is sensitive to both electrical permittivity and conductivity in the subsurface, however, using only surface acquired data remains a challenge because of the lack of low frequencies and the presence of attenuation in the GPR data. We overcome these challenges by jointly inverting GPR data with electrical resistivity (ER) data, which is also sensitive to conductivity. We present the following three non-linear inverse methods: (i) jointly inverting GPR and ER data to constrain the low frequency component of the conductivity solution, (ii) adapting the envelope transform, as is used in seismic FWI, to further improve the low frequencies of both conductivity and permittivity, (iii) and using the cross-gradients operator to inform the conductivity and permittivity solutions of their respective geometries in order to improve their resolution. We present synthetic results on a realistic scenario and advances on a data set collected at the Boise Hydrological Research Site.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMNS12A..05D
- Keywords:
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- 0920 Gravity methods;
- EXPLORATION GEOPHYSICS;
- 0925 Magnetic and electrical methods;
- EXPLORATION GEOPHYSICS;
- 0935 Seismic methods;
- EXPLORATION GEOPHYSICS;
- 0999 General or miscellaneous;
- EXPLORATION GEOPHYSICS