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Reliability of resistivity-derived temperature: insights from laboratory measurements
Robert, Tanguy; Hermans, Thomas; Dumont, Gaël et al.
20132nd International Workshop on Geoelectrical Monitoring - GELMON 2013
 

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Keywords :
Laboratory experiment; temperature monitoring; electrical resistivity; chemical equilibrium; kinetics
Abstract :
[en] This contribution consists in studying the reliability of resistivity-derived temperature, for example from time-lapse electrical resistivity tomography (ERT) surveys. The idea of using temperature as a quantitative tracer is growing in the hydrogeophysical community, especially to simulate geo/hydrothermal systems. However, plenty of physico-chemical processes are influenced by temperature and most of them impact directly resistivity measurements. Therefore, one needs to take them into account to retrieve quantitative temperature estimates from resistivity measurements but, up to now, it is seldom the case. The experiment we conducted consisted in simulating an ERT monitoring of heat storage in a sandy aquifer. We show that using experimental relationships between fluid electrical conductivity and temperature alone does not allow reliable temperature estimates, simply because rock-water interactions are neglected. Worst, from a certain temperature (45°C here), the bulk resistivity starts to increase with temperature although this is not expected from the experimental law. Chemical analyses made on water samples collected during the experiment highlight the importance of accounting chemical reactions (e.g. calcite precipitation with increasing temperature) occurring when temperature changes as well as their kinetics. Finally, other parameters as surface conductivity cannot always be neglected when estimating temperature from resistivity measurements. This means that retrieving reliable temperatures from bulk resistivity measurements (e.g. time-lapse ERT) requires the knowledge of water mineralization as well as the rock / soil mineralogy in order to fully integrate physico-chemical reactions between groundwater and the host rock, for example with a joint inversion scheme.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Robert, Tanguy ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Hermans, Thomas ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Dumont, Gaël ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Nguyen, Frédéric ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Language :
English
Title :
Reliability of resistivity-derived temperature: insights from laboratory measurements
Publication date :
06 December 2013
Event name :
2nd International Workshop on Geoelectrical Monitoring - GELMON 2013
Event organizer :
Geological Survey of Austria
Event place :
Vienna, Austria
Event date :
December 4 to December 6, 2013
Audience :
International
Funders :
Région wallonne - Shanks
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 03 December 2013

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