Communication orale non publiée/Abstract (Colloques et congrès scientifiques)
Groundwater temperature estimation and modeling using hydrogeophysics
Nguyen, Frédéric; Lesparre, Nolwenn; Hermans, Thomas et al.
20172017 AGU Fall Meeting
 

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Résumé :
[en] Groundwater temperature may be of use as a state variable proxy for aquifer heat storage, highlighting preferential flow paths, or contaminant remediation monitoring. However, its estimation often relies on scarce temperature data collected in boreholes. Hydrogeophysical methods such as electrical resistivity tomography (ERT) and distributed temperature sensing (DTS) may provide more exhaustive spatial information of the bulk properties of interest than samples from boreholes. If a properly calibrated DTS reading provides direct measurements of the groundwater temperature in the well, ERT requires one to determine the fractional change per degree Celsius. One advantage of this petrophysical relationship is its relative simplicity: the fractional change is often found to be around 0.02 per degree Celcius, and represents mainly the variation of electrical resistivity due to the viscosity effect. However, in presence of chemical and kinetics effects, the variation may also depend on the duration of the test and may neglect reactions occurring between the pore water and the solid matrix. Such effects are not expected to be important for low temperature systems (<30 °C), at least for short experiments. In this contribution, we use different field experiments under natural and forced flow conditions to review developments for the joint use of DTS and ERT to map and monitor the temperature distribution within aquifers, to characterize aquifers in terms of heterogeneity and to better understand processes. We show how temperature time-series measurements might be used to constraint the ERT inverse problem in space and time and how combined ERT-derived and DTS estimation of temperature may be used together with hydrogeological modeling to provide predictions of the groundwater temperature field.
Disciplines :
Géologie, ingénierie du pétrole & des mines
Auteur, co-auteur :
Nguyen, Frédéric ;  Université de Liège - ULiège > Département ArGEnCo > Géophysique appliquée
Lesparre, Nolwenn
Hermans, Thomas
Dassargues, Alain  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Klepikova, Maria
Kemna, Andreas
Caers, Jef
Langue du document :
Anglais
Titre :
Groundwater temperature estimation and modeling using hydrogeophysics
Date de publication/diffusion :
2017
Nom de la manifestation :
2017 AGU Fall Meeting
Lieu de la manifestation :
New Orleans, Etats-Unis
Date de la manifestation :
from 11-12-2017 to 15-12-2017
Sur invitation :
Oui
Manifestation à portée :
International
Disponible sur ORBi :
depuis le 17 juin 2018

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