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13 December 2011
Unpublished conference/Abstract (Scientific congresses and symposiums)
Inversion of multi-temporal geoelectrical data sets: insights from several case studies
Nguyen, Frédéric  ; Kemna, Andreas; Robert, Tanguy  et al.
2011 • 1st International Workshop on Geoelectrical Monitoring - GELMON 2011
 

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Keywords :
Inversion; Time-lapse; Error characterization
Abstract :
[en] Time-lapse inversion of geoelectrical data is increasingly growing as remote monitoring systems are being used in more applications such as seawater intrusions, landslides, bioremediation of contaminated sites, landfill operations, shallow geothermal systems, or water resources. To date, several inversion strategies exist for taking into account the temporal dimension of the data. Among the most used ones are the independent inversion of multi-temporal data sets, the difference inversion, the temporally-constrained inversion, and the more recent process-based inversion. The success of a particular time-lapse inversion scheme depends on the validity of several assumptions made by these inversion schemes. Difference inversion schemes generally assume that part of the noise contained in the data cancels out when working with temporal data differences. Process-based inversion requires a more advanced knowledge of the system prior the inversion. Temporally-constrained inversion on the other hand assumes that the changes are localized and minor. We show in this paper using data sets with different time and spatial scales, and with different degrees of geological complexity and resistivity contrasts, that the particular success of a time-lapse inversion scheme is highly dependent on the temporal behaviour of the noise estimation in the time-lapse data set and of the model-dependent resolution pattern of the survey. We attempt to provide guidelines for successful quantitative interpretation of time-lapse data sets whenever possible.
Research center :
Université de Liège - Département ArGEnCo - GEO³ - Geophysique Appliquée
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Nguyen, Frédéric ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Kemna, Andreas;  University of Bonn > Steinmann-Institute > Geodynamics / Geophysics
Robert, Tanguy ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Hermans, Thomas ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Caterina, David ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Flores-Orozco, Adrian;  University of Bonn > Steinmann-Institute > Geodynamics / Geophysics
Language :
English
Title :
Inversion of multi-temporal geoelectrical data sets: insights from several case studies
Publication date :
December 2011
Event name :
1st International Workshop on Geoelectrical Monitoring - GELMON 2011
Event organizer :
Geological Survey of Austria
Event place :
Vienna, Austria
Event date :
from 30-11-2011 to 02-12-2011
Audience :
International
Name of the research project :
Identification, caractérisation et suivi géophysique des écoulements préférentiels des eaux souterraines en milieu fracturé
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture
F.R.S.-FNRS - Fonds de la Recherche Scientifique

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