The Franconian Basin thermal anomaly: testing its origin by conceptual 2‑D models of deep‑seated heat sources covered by low thermal conductivity sediments

Journal article
(Original article)


Publication Details

Author(s): Kämmlein M, Dietl C, Stollhofen H
Journal: International Journal of Energy and Environmental Engineering
Publication year: 2019
ISSN: 2251-6832
Language: English


Abstract

This study presents conceptual 2-D models for coupled fluid flow and heat transport simulations of the Franconian Basin in SE Germany to verify the plausibility of different hypothesis on the origin of a local temperature anomaly. The simulated geothermal systems consist of a deep-seated heat source within an impermeable basement (heat-producing granite or enhanced background heat flow), covered by low thermal conductivity sediments. Solely conductive or additional convective heat transport including the presence of a permeable fault was applied. We found that heat transfer in the model setups is strongly controlled by (1) the volume of the heat-producing granite, (2) the amount of the background heat flow, (3) the permeability
of the basement rocks, (4) the thermal conductivity contrasts between the sedimentary cover and the basement, and (5) the type of heat transport. If there is no reliable information on these model parameters, a high degree of uncertainty with regard to quantitative statements on the heat transfer in the specific geothermal system can be expected. An equilibrium temperature log from the study area could only be reproduced by (1) an enhanced background heat flow of 0.115 W m2, in combination with a permeable fault zone of permeability 1.0 × 10−13 m2 or (2) a heat-producing granite of large cross-sectional area (300 km2) in combination with an average background heat flow of 0.070 W m2. Moreover, high temperatures were only
achieved in the presence of a low conductive, insulating cover above the heat source.


FAU Authors / FAU Editors

Kämmlein, Marion
Lehrstuhl für Geologie (Exogene Dynamik)
Stollhofen, Harald Prof. Dr.
Lehrstuhl für Geologie (Exogene Dynamik)


How to cite

APA:
Kämmlein, M., Dietl, C., & Stollhofen, H. (2019). The Franconian Basin thermal anomaly: testing its origin by conceptual 2‑D models of deep‑seated heat sources covered by low thermal conductivity sediments. International Journal of Energy and Environmental Engineering. https://dx.doi.org/10.1007/s40095-019-00315-2

MLA:
Kämmlein, Marion, Carlo Dietl, and Harald Stollhofen. "The Franconian Basin thermal anomaly: testing its origin by conceptual 2‑D models of deep‑seated heat sources covered by low thermal conductivity sediments." International Journal of Energy and Environmental Engineering (2019).

BibTeX: 

Last updated on 2019-04-09 at 08:23