Reference : Monitoring a shallow geothermal experiment in a sandy aquifer using electrical resist...
Scientific congresses and symposiums : Poster
Engineering, computing & technology : Geological, petroleum & mining engineering
http://hdl.handle.net/2268/76464
Monitoring a shallow geothermal experiment in a sandy aquifer using electrical resistivity tomography: a feasibility study
English
Hermans, Thomas mailto [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géophysique appliquée >]
Vandenbohede, Alexander [> >]
Nguyen, Frédéric mailto [Université de Liège - ULg > Département Argenco : Secteur GEO3 > Géophysique appliquée >]
Lebbe, Luc [> >]
6-May-2010
Yes
No
International
EGU General Assembly
du 2 mai 2010 au 7 mai 2010
European Geosciences Union
Vienna
Austria
[en] Geothermal experiment ; Electrical resistivity tomography ; shallow aquifer
[en] Geothermal resources, especially groundwater resources, are increasingly used around the world. It is therefore necessary to improve the characterisation of thermal parameters of the aquifers. This is done mostly with thermal response tests. In this work, we monitored with electrical resistivity tomography a geothermal test on the campus of Ghent University (Belgium). We injected warm water (45°C) into a sandy aquifer where the groundwater has a temperature of 10°C at a rate of 100 liter/hour during three days. Laboratory measurements indicated that we could expect at most a change of 2%/°C of the water electrical conductivity. The time-lapse series of electrical images show clearly the thermal plume corresponding to the injected water with a maximum change of minus 20% after 72 hours of injection. A comparison with a geothermal model shows that the anomaly is well detected but also distorded due to the inversion regularization (smoothness constraint). ERT enabled to follow the evolution of the injected heated water with more spatial coverage that traditionnal techniques. ERT is thus an interesting tool to monitor the exploitation of geothermal resources. In the future, it will be necessary to improve the inversion process to use quantitavely such results in a calibration process.
Researchers ; Professionals
http://hdl.handle.net/2268/76464

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Open access
Poster EGU.pdfAuthor postprint558.23 kBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.