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Comparison of temperature estimates from heat transport model and electrical resistivity tomography during a shallow heat injection and storage experiment
Hermans, Thomas; Daoudi, Moubarak; Vandenbohede, Alexander et al.
2012In Berichte der Geologischen Bundesanstalt, 93, p. 43-48
 

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Keywords :
Electrical resistivity tomography; time-lapse monitoring; thermal properties; hydrogeological modeling; thermal test
Abstract :
[en] Groundwater resources are increasingly used around the world as geothermal systems. Understanding physical processes and quantification of parameters determining heat transport in porous media is therefore important. Geophysical methods may be useful in order to yield additional information with greater coverage than conventional wells. We report a heat transport study during a shallow heat injection and storage field test. Heated water (about 50°C) was injected for 6 days at the rate of 80 l/h in a 10.5°C aquifer. Since bulk electric resistivity variations can bring important information on temperature changes in aquifers (water electric conductivity increases about 2%/°C around 25°C), we monitored the test with surface electric resistivity tomography and demonstrate its ability to monitor spatially temperature variations. Time-lapse electric images clearly show the decrease and then the increase in bulk electric resistivity of the plume of heated water, during respectively the injection and the storage phase. This information enabled to calibrate the conceptual flow and heat model used to simulate the test. Inverted resistivity values are validated with borehole electromagnetic measurements (EM39) and are in agreement with the temperature logs used to calibrate the parameters of the thermo-hydrogeological model for the injection phase. This field work demonstrates that surface electric resistivity tomography can monitor heat and storage experiments in shallow aquifers. These results could potentially lead to a number of practical applications, such as the monitoring or the design of shallow geothermal systems or the use of heated water to replace salt water in tracer tests.
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Hermans, Thomas ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Daoudi, Moubarak ;  Université de Liège - ULiège > 2e an. master ingé. civ. mines & géol., fin. appr.
Vandenbohede, Alexander;  Universiteit Gent - Ugent > Geology and Soil Science > Groundwater Modelling
Robert, Tanguy ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Caterina, David  ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Nguyen, Frédéric ;  Université de Liège - ULiège > Département Argenco : Secteur GEO3 > Géophysique appliquée
Language :
English
Title :
Comparison of temperature estimates from heat transport model and electrical resistivity tomography during a shallow heat injection and storage experiment
Alternative titles :
[fr] Comparaison d'estimations de températures de modèles de transports et de tomographies de résistivité électrique durant un test d'injection et de stockage de chaleur à faible profondeur
Publication date :
September 2012
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
Journal title :
Berichte der Geologischen Bundesanstalt
ISSN :
1017-8880
Publisher :
Geologische Bundesanstalt, Wien, Austria
Special issue title :
International Workshop on Geoelectric Monitoring - Geoelectric Monitoring - Current Research and Perspectives for the Future
Volume :
93
Pages :
43-48
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 30 November 2011

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