Reference : A shallow geothermal experiment in a sandy aquifer monitored using electric resistivi...
Scientific journals : Article
Engineering, computing & technology : Geological, petroleum & mining engineering
http://hdl.handle.net/2268/103103
A shallow geothermal experiment in a sandy aquifer monitored using electric resistivity tomography
English
[en] Expérience géothermique peu profonde dans un aquifère sableux suivie par tomographie de résistivité électrique
Hermans, Thomas mailto [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géophysique appliquée >]
Vandenbohede, Alexander mailto [Universiteit Gent - Ugent > Geology ans Soil Science > Groundwater Modelling > >]
Lebbe, Luc mailto [Universiteit Gent - Ugent > Geology and Soil Science > Groundwater Modelling > >]
Nguyen, Frédéric mailto [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géophysique appliquée >]
2012
Geophysics
Society of Exploration Geophysicists
77
1
B11-B21
Yes (verified by ORBi)
International
0016-8033
[en] electric resistivity tomography ; monitoring ; thermal properties ; time-lapse
[en] Groundwater resources are increasingly used around the world for geothermal exploitation systems. To monitor such systems and to estimate their governing parameters, we rely mainly on borehole observations of the temperature field at a few locations. Bulk electrical resistivity variations can bring important information on temperature changes in aquifers. In this paper, we demonstrate the ability of surface electrical resistivity tomography to monitor spatially temperature variations in a sandy aquifer during a thermal injection test. Heated water (48°C) was injected for 70 hours at the rate of 87 l/h in a 10.5°C aquifer. Temperature changes derived from time-lapse electrical images are in agreement with laboratory water electrical conductivity-temperature measurements. In parallel, a coupled hydrogeological saturated flow and heat transport model was calibrated on geophysical data for the conceptual model, and on hydrogeological and temperature data for the parameters. The resistivity images showed an upper flow of heated water along the well above the injection screens and lead to a new conceptualization of the hydrogeological source term. The comparison between the temperature models derived from resistivity images and from the simulations is satisfactory. Quantitatively, resistivity changes allowed estimating temperature changes within the aquifer, and qualitatively, the heated plume evolution was successfully monitored. This work demonstrates the ability of electrical resistivity tomography to study 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.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/103103
10.1190/geo2011-0199.1
Publisher : Society of Exploration Geophysics (SEG)

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