2D modelling of induced polarization data with anisotropic complex conductivities
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| Title: | Main Title: 2D modelling of induced polarization data with anisotropic complex conductivities |
| Description: | Abstract: Induced polarization data recorded at the field scale are usually processed using techniques based on isotropy. We study the effect of anisotropic complex conductivities in the frequency domain, with a particular emphasis on the polarization properties (i.e., phase angles). We consider anisotropy to be caused by a thin layering of isotropic media. Based on this, we derive corresponding mixing laws for the phase angles parallel and perpendicular to the layering and show that in cases of anisotropic layering, phase angles can only exist if the complex conductivity magnitudes are also anisotropic. We modified an existing isotropic finite-element forward modelling code to support anisotropic complex conductivities. Based on an isotropic 2D inversion of a synthetic data set generated for an anisotropic model, we show that ignoring anisotropy may lead to artefacts and poor model recovery. Finally, we investigate a field data set recorded over a fault system in Germany, where anisotropic conductivities are expected. The isotropic 2D inversion of this data set yields a complex image that is difficult to interpret. We suggest an alternative interpretation based on trial-and-error forward modelling with anisotropic complex conductivities, using geological a priori information to constrain the model. The obtained model has a much simpler structure, consistent with the anticipated geology but yet is able to explain the measured data. |
| Identifier: | 10.3997/1873-0604.2012050 (DOI) |
Responsible Party
| Creators: | Johannes Kenkel (Author), Andreas Hoerdt (Author), Andreas Kemna (Author) |
| Publisher: | European Association of Geoscientists & Engineers |
| Publication Year: | 2013 |
Topic
| TR32 Topic: | Soil |
| Related Subproject: | A3 |
| Subject: | Keyword: Polarization |
File Details
| Filename: | 2012_Kenkel_NSG.pdf |
| Data Type: | Text - Article |
| Size: | 12 Pages |
| File Size: | 2.9 MB |
| Date: | Issued: 01.12.2012 |
| Mime Type: | application/pdf |
| Language: | English |
| Status: | Completed |
Constraints
| Download Permission: | Only Project Members |
| General Access and Use Conditions: | For internal use only |
| Access Limitations: | For internal use only |
| Licence: | [TR32DB] Data policy agreement |
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Specific Information - Publication
| Publication Status: | Published |
| Review Status: | Peer reviewed |
| Publication Type: | Article |
| Article Type: | Journal |
| Source: | Near Surface Geophysics |
| Source Website: | www.nsg.eage.org |
| Issue: | 6 |
| Volume: | 10 |
| Number of Pages: | 12 (533 - 544) |
Metadata Details
| Metadata Creator: | Johannes Kenkel |
| Metadata Created: | 09.12.2013 |
| Metadata Last Updated: | 09.12.2013 |
| Subproject: | A3 |
| Funding Phase: | 2 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 780 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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