Geophysical Methods for Monitoring Temperature Changes in Shallow Low Enthalpy Geothermal Systems

Energies

Thomas Hermans¹  Frຝéric Nguyen¹  Tanguy Robert² 

[1] Applied Geophysics, University of Liege, Chemin des Chevreuils 1, 4000 Liege, Belgium; E-Mail:;R&D Department, AQUALE SPRL, Rue Montellier 22, 5380 Noville-les-Bois, Belgium; E-Mail:

关键词: electrical resistivity tomography;    self-potential method;    distributed temperature sensing;    temperature monitoring;   

DOI  :  10.3390/en7085083

来源: mdpi

【 摘 要 】

Low enthalpy geothermal systems exploited with ground source heat pumps or groundwater heat pumps present many advantages within the context of sustainable energy use. Designing, monitoring and controlling such systems requires the measurement of spatially distributed temperature fields and the knowledge of the parameters governing groundwater flow (permeability and specific storage) and heat transport (thermal conductivity and volumetric thermal capacity). Such data are often scarce or not available. In recent years, the ability of electrical resistivity tomography (ERT), self-potential method (SP) and distributed temperature sensing (DTS) to monitor spatially and temporally temperature changes in the subsurface has been investigated. We review the recent advances in using these three methods for this type of shallow applications. A special focus is made regarding the petrophysical relationships and on underlying assumptions generally needed for a quantitative interpretation of these geophysical data. We show that those geophysical methods are mature to be used within the context of temperature monitoring and that a combination of them may be the best choice regarding control and validation issues.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.