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Assessing electrical resistivity tomography for hydrofacies detection using a sensitivity dependent probabilistic methodology
Hermans, Thomas; Irving, James
2015In EarthDoc - Near Surface Geosciences 2015
Peer reviewed
 

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Keywords :
Electrical resistivity tomography; sensitivity; hydrofacies; probabilistic method
Abstract :
[en] Alluvial aquifers are generally composed of several facies with complex architectures and interconnections depending on the fluvial system. In this context, electrical resistivity tomography (ERT) may provide important information on the spatial distribution of hydrogeological parameters. However, ERT inversion introduces some bias in the resulting resistivity distribution due to regularization and resolution issues. In this study, we refine ERT inversions by incorporating prior information in order to improve the identification of facies through a probabilistic relationship derived from collocated measurements. We then analyze with synthetic cases the effect of spatially varying sensitivity on the probabilistic relationship. As expected, when sensitivity decreases, the distributions of resistivity for the different facies tend to be superimposed. A mean distribution thus overestimates the ability of surface ERT to discriminate hydrofacies in depth.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Hermans, Thomas ;  Université de Liège > Département ArGEnCo > Géophysique appliquée
Irving, James;  Université de Lausanne
Language :
English
Title :
Assessing electrical resistivity tomography for hydrofacies detection using a sensitivity dependent probabilistic methodology
Publication date :
08 September 2015
Event name :
21st European Meeting of Environmental and Engineering Geophysics
Event organizer :
EAGE
Event place :
Turin, Italy
Event date :
September 7, 2015 to September 9, 2015
Audience :
International
Main work title :
EarthDoc - Near Surface Geosciences 2015
ISBN/EAN :
978-151081412-7
Pages :
Tu21A02
Peer reviewed :
Peer reviewed
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Fondation Roi Baudouin - Prix Ernest Dubois
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since 01 September 2015

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