Scholarly record
EVALUATION OF THE THERMAL CONDUCTIVITY OF SANDY, CLAYEY AND DOLOMITE CONTAINING LAYERS OF GEOLOGICAL FORMATION
Abstract
The thermal conductivity of a geological structure is a paramount parameter in performing calculations for the proper design and installation of underground heat energy extraction or storage systems. Complex geological investigation must be performed to evaluate the thermal conductivity of a geological structure. It is a process that demands time and money. An assessment of the mutual influence between the thermal conductivity of the borehole heat exchanger and the geological structure allows us to predict the thermal conductivity faster and cheaper than performing a complex geological investigation. Seventeen test borehole heat exchangers (BHE) were installed during the research. A determination of the thermal conductivity of the geological structure was performed by the Thermal Response Test (TRT) using data collected in-situ from a BHE. Geological conditions were interpreted from the gathered soil samples and the geophysical investigation data collected in the borehole. The thermal conductivity of the separate geological layers with different lithological compositions is calculated using the weight method. The generalized thermal conductivity values of Quaternary sandy layers is 2,35 W/m*K, clayey sediments - 1,57 W/m*K, Cretaceous and Jurassic clayey rocks buried from the 80m to 110m depth is 2,27 W/m*K and 2,06 W/m*K accordingly, Devonian dolomite - 2,86 W/m*K. The classified thermal conductivity values for separate geological bedrocks allow us to predict the thermal conductivity for the whole geological structure from the geological data alone. In the majority of cases the calculated and evaluated values are accurate within 5%.
Publication Impact Profile
Publication details
References11
Szabó N. P., 2011. Shale volume estimation based on the factor analysis of well-logging data. Acta Geophysica, 59, 935-953. DOI: 10.2478/s11600-011-0034-0
Abu-Hamdeh N. H., Reeder. R. C.,2000. Soil Thermal Conductivity: Effects of Density, Moisture, Salt Contentration, and Organic Matter. Soil Science Society of. America Journal. J 64:1285-1290.
Sanner B., Hellström G., Spitler J., Gehlin S., Thermal Response Test – Current Status and World-Wide Application. Procedings World Geothermal Congress 2005. Amntalya, Turkey, 24-29 April 2005.
European Standard EN ISO 17628:2015, Geotechnical Investigation and testing – Geothermal testing – Determination of thermal conductivity of soil and rock using a borehole heat exchanger.
R. Mokrik. 2003. Baltijos Baseino Paleohidrogeologija. Vilnius: Vilniaus universiteto leidykla. 333 p.
Giedraitienė J., Putys P., 2012. „Požeminio vandens aktyviosios apytakos zonos hidrogeotermija“ LGT fondas Nr. 36340; - 66 p.
Palaitis Ž., Skatūnas J., 2016. Geologinių pjūvių sudėties ir šiluminio laidumo vertės koreliacija. Geologija Geografija . T. 2. Nr. 4. P. 182-194.
Presley M. A., Christensen P. R., 1997. The effect of bulk density and particle size sorting on the thermal conductivity of particulate materials under Martian atmospheric pressure. Journal of geophysical research, vol. 102, No. E4, pages 9221-9229, April 25.
Lauser C., Huenges E., 1995. Thermal Conductivity of Rocks and Minerals, Rock Physics and Realations, Copyright by the American Geophysical Union.
Fricke B. A., Misra A., Becker B.R., Stewart W. E., 1992. Soil thermal conductivity: effects of saturation and dry density. University of Misouri-Kansas City.
Eppelbaum L. at al., 2014. Thermal properties of rocks and soil density of fluids, Applied Geothermics, Lecture notes in Earth System Sciences, DOI: 10.1007/978-3-642-34023-9_2, Springer-Verlag Berlin Heidelberg.
View or Download full articleAccess options
SWS access login
Login as SWS Scientific CommitteeLogin as SWS Scientific PartnerLogin as SWS AuthorAuthors and approved SWS contributors will read and export their own linked papers after identity matching by SWS profile, email and SGEM GlobalID.
For librarian assistance: [email protected]
Purchase Instant Access
- Article can be downloaded after successful payment.
- Article may be used according to SWS library access terms.
- Article cannot be redistributed.
