[554] - 2D modelling of induced polarization data with anisotropic complex conductivities

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Kenkel, J., 2012. 2D modelling of induced polarization data with anisotropic complex conductivities. PhD Report, Department of Geodynamics and Geophysics, University of Bonn, Bonn, Germany. Accessed from https://www.tr32db.uni-koeln.de/data.php?dataID=554 at 2019-07-20.
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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 layering anisotropic 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.
Responsible Party
Creator(s):Author: Johannes Kenkel
Publisher:CRC/TR32 Database (TR32DB)
TR32 Topic:Other
Subject(s):CRC/TR32 Keywords: PhD Report
File Details
File Name:Report1_Kenkel_2011.pdf
Data Type:Text
File Size:3810 kB (3.721 MB)
Date(s):Available: 2012-08-01
Mime Type:application/pdf
Download Permission:OnlyTR32
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:None
Measurement Location:--None--
Specific Informations - Report
Report Date:1st of August, 2012
Report Type:PhD Report
Report City:Bonn, Germany
Report Institution:Department of Geodynamics and Geophysics, University of Bonn
Number Of Pages:25
Period of Pages:1 - 25
Further Informations:TR32 Student Report Phase II
Metadata Details
Metadata Creator:Johannes Kenkel
Metadata Created:2013-10-31
Metadata Last Updated:2013-10-31
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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