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A Triple-Grid Technique for the 3D Inversion of DC Resistivity Data Incoporating Arbitrary TopographyNormal access

Authors: T. Günther and C. Rücker
Event name: Near Surface 2005 - 11th European Meeting of Environmental and Engineering Geophysics
Session: Electrical and Electromagnetic Methods 4
Publication date: 04 September 2005
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 497.5Kb )
Price: € 20

Summary:
A024 A TRIPLE-GRID TECHNIQUE FOR THE 3D INVERSION OF DC RESISTIVITY DATA INCOPORATING ARBITRARY TOPOGRAPHY Summary 1 We present a novel technique for the determination of resistivity structures associated with arbitrary surface topography. The approach represents a triple-grid dc resistivty inversion technique which is based on unstructured tetrahedral meshes and a finite element forward operator applied to the secondary potential. We use a Gauss-Newton method with inexact line search to fit the data within error bounds. A global regularization scheme using special smoothness constraints is applied. The regularization parameter compromising data misfit and model roughness is determined by an L-curve


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