[780] - 2D modelling of induced polarization data with anisotropic complex conductivities

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Kenkel, J., Hoerdt, A., Kemna, A., 2012. 2D modelling of induced polarization data with anisotropic complex conductivities. Near Surface Geophysics, 10 (6), 533 - 544. DOI: 10.3997/1873-0604.2012050.
Title(s):Main Title: 2D modelling of induced polarization data with anisotropic complex conductivities
Description(s):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(s):DOI: 10.3997/1873-0604.2012050
Responsible Party
Creator(s):Author: Johannes Kenkel
Author: Andreas Hoerdt
Author: Andreas Kemna
Publisher:European Association of Geoscientists & Engineers
TR32 Topic:Soil
Subject(s):CRC/TR32 Keywords: Polarization
File Details
File Name:2012_Kenkel_NSG.pdf
Data Type:Text
Size(s):12 Pages
File Size:2948 kB (2.879 MB)
Date(s):Issued: 2012-12-01
Mime Type:application/pdf
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:Germany
Measurement Location:--Germany--
Specific Informations - Publication
Article Type:Journal
Source:Near Surface Geophysics
Number Of Pages:12
Page Range:533 - 544
Metadata Details
Metadata Creator:Johannes Kenkel
Metadata Created:2013-12-09
Metadata Last Updated:2013-12-09
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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