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| Titel |
Evaluation of the heat-storage capability of shallow aquifers using active heat tracer tests and Fiber-Optics Distributed-Temperature-Sensing |
| VerfasserIn |
Klodwig Suibert Oskar Seibertz, Marian Andrei Chirila, Jan Bumberger, Peter Dietrich, Thomas Vienken |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250105988
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| Publikation (Nr.) |
 EGU/EGU2015-5599.pdf |
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| Zusammenfassung |
| In the course of the energy transition, geothermal energy storage and heat generation and
cooling have proven to be environmental friendly alternatives to conventional energy.
However, to ensure sustain usage, the heat transport behavior of aquifers and its distribution
has to be studied.
A tool to achieve this is the active heat tracer test, eg. Leaf et al. (2012). If active heat
tracer tests are combined with in aquifer heat testing via electric heating-cables, eg. Liu et al.
(2013), it is possible to observe heat transport and temperature signal decay without
disturbing the original pressure field within the aquifer.
In this field study a two channel High-Resolution-Fiber-Optic-Distributed-Temperature-Sensing
and Pt100 were used to measure temperature signals within in two wells of 1.4 m distance,
where the temperature difference was generated using a self regulating heating cable in the
upstream well. High resolution Distributed-Temperature-Sensing measurements were
achieved by coiling the fiber around screened plastic tubes. The upstream well was
also used to observe heating (δ Tmax approx. 24K) and temperature signal
decay, while the downstream well was used to observe heat transport between both
wells.
The data was analyzed and compared to thermal conductivity of soil samples and
Direct-Push (DP) Electrical-Conductivity-Logging and DP Hydraulic-Profiling
results.
The results show good agreement between DP data and temperature measurements
proving the active heat tracer test is a suitable tool for providing reliable information on
aquifer heat-storage capability.
References
Leaf, A.T., Hart, D.J., Bahr, J.M.: Active Thermal Tracer Tests for Improved
Hydrostratigraphic Characterization. Ground Water, vol. 50, 2012
Liu, G., Knobbe, S., Butler, J.J.Jr.: Resolving centimeter-scale flows in aquifers
and their hydrostratigraphic controls. Geophysical Research Letters, vol. 40, 2013 |
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