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A shallow geothermal experiment in a sandy aquifer monitored using electric resistivity tomography

Thomas Hermans, Alexander Vandenbohede UGent, Luc Lebbe UGent and Frédéric Nguyen (2012) GEOPHYSICS. 77(1). p.B11-B21
abstract
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 electric resistivity variations can bring important information on temperature changes in aquifers. We have used surface electric resistivity tomography to monitor spatially temperature variations in a sandy aquifer during a thermal injection test. Heated water (48 degrees C) was injected for 70 hours at the rate of 87 l/h in a 10.5 degrees C aquifer. Temperature changes derived from time-lapse electric images were in agreement with laboratory water electric conductivity-temperature measurements. In parallel, a coupled hydrogeologic saturated flow and heat transport model was calibrated on geophysical data for the conceptual model, and on hydrogeologic and temperature data for the parameters. The resistivity images showed an upper flow of heated water along the well above the injection screens and led to a new conceptualization of the hydrogeologic source term. The comparison between the temperature models derived from resistivity images and from the simulations was 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 electric 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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
INVERSION, SOLUTE, FIELD-TEST, TRACER TESTS, POROUS-MEDIA, THERMAL-ENERGY STORAGE, HEAT-TRANSPORT, CONDUCTIVITY, WATER, TEMPERATURE
journal title
GEOPHYSICS
Geophysics
volume
77
issue
1
pages
B11 - B21
Web of Science type
Article
Web of Science id
000300767000024
JCR category
GEOCHEMISTRY & GEOPHYSICS
JCR impact factor
1.723 (2012)
JCR rank
32/76 (2012)
JCR quartile
2 (2012)
ISSN
0016-8033
DOI
10.1190/GEO2011-0199.1
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1252140
handle
http://hdl.handle.net/1854/LU-1252140
date created
2011-06-05 21:22:43
date last changed
2012-07-06 16:03:47
@article{1252140,
  abstract     = {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 electric resistivity variations can bring important information on temperature changes in aquifers. We have used surface electric resistivity tomography to monitor spatially temperature variations in a sandy aquifer during a thermal injection test. Heated water (48 degrees C) was injected for 70 hours at the rate of 87 l/h in a 10.5 degrees C aquifer. Temperature changes derived from time-lapse electric images were in agreement with laboratory water electric conductivity-temperature measurements. In parallel, a coupled hydrogeologic saturated flow and heat transport model was calibrated on geophysical data for the conceptual model, and on hydrogeologic and temperature data for the parameters. The resistivity images showed an upper flow of heated water along the well above the injection screens and led to a new conceptualization of the hydrogeologic source term. The comparison between the temperature models derived from resistivity images and from the simulations was 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 electric 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.},
  author       = {Hermans, Thomas and Vandenbohede, Alexander and Lebbe, Luc and Nguyen, Fr{\'e}d{\'e}ric},
  issn         = {0016-8033},
  journal      = {GEOPHYSICS},
  keyword      = {INVERSION,SOLUTE,FIELD-TEST,TRACER TESTS,POROUS-MEDIA,THERMAL-ENERGY STORAGE,HEAT-TRANSPORT,CONDUCTIVITY,WATER,TEMPERATURE},
  language     = {eng},
  number       = {1},
  pages        = {B11--B21},
  title        = {A shallow geothermal experiment in a sandy aquifer monitored using electric resistivity tomography},
  url          = {http://dx.doi.org/10.1190/GEO2011-0199.1},
  volume       = {77},
  year         = {2012},
}

Chicago
Hermans, Thomas, Alexander Vandenbohede, Luc Lebbe, and Frédéric Nguyen. 2012. “A Shallow Geothermal Experiment in a Sandy Aquifer Monitored Using Electric Resistivity Tomography.” Geophysics 77 (1): B11–B21.
APA
Hermans, T., Vandenbohede, A., Lebbe, L., & Nguyen, F. (2012). A shallow geothermal experiment in a sandy aquifer monitored using electric resistivity tomography. GEOPHYSICS, 77(1), B11–B21.
Vancouver
1.
Hermans T, Vandenbohede A, Lebbe L, Nguyen F. A shallow geothermal experiment in a sandy aquifer monitored using electric resistivity tomography. GEOPHYSICS. 2012;77(1):B11–B21.
MLA
Hermans, Thomas, Alexander Vandenbohede, Luc Lebbe, et al. “A Shallow Geothermal Experiment in a Sandy Aquifer Monitored Using Electric Resistivity Tomography.” GEOPHYSICS 77.1 (2012): B11–B21. Print.