Sven Fuchs

Sven Fuchs
Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences · Geosystems (Section Geoenergy)

Dr. rer. nat.
GFZ Group Leader | Task Force Leader (TF VIII) of the International Lithosphere Program (ILP) | IHFC Custodian Heat Flow

About

79
Publications
40,252
Reads
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550
Citations
Introduction
My research interests focus on the Earth's thermal field and its relevance for both the technological utilization of the subsurface (exploration of resources, geothermal production, geological storage of energy and waste, hydrocarbon generation, etc.) as well as for geodynamic processes. This includes detailed studies of the heat-flow evolution and associated thermal and hydraulic rock properties, considering the affecting geoscientific processes across scales and times. For this task, I integrate geological data on various scales with geophysical surveys from boreholes (well-log interpretation) and surface (seismic data) as well as with data from laboratory studies of rock physics and chemistry into numerical models. http://scholar.google.ca/citations?user=Z-ntGqkAAAAJ
Additional affiliations
July 2021 - present
Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ
Position
  • Group Leader
Description
  • Working Group: 'Exploration of Thermal Geosystems'
October 2017 - March 2020
Universität Potsdam
Position
  • Lecturer
Description
  • Modules: Fundamentals in geothermics (4 SWS), Geothermics & Geodynamics (4 SWS)
October 2016 - January 2017
University of Greifswald
Position
  • Lecturer
Description
  • Course: Introduction to Geophysics (2 SWS)
Education
April 2009 - July 2013
Universität Potsdam
Field of study
  • Geology
October 2001 - August 2007
Technische Universität Berlin
Field of study
  • Geoingenieurwissenschaften

Publications

Publications (79)
Data
This data publication (data download via: http://heatflow.ihfc-iugg.org/data) contains the compilation of global heat-flow data by the International Heat Flow Commission (IHFC; http://www.ihfc-iugg.org/) of the International Association of Seismology and Physics of the Earth's Interior (IASPEI). The presented data release 2021 contains data generat...
Article
Full-text available
Mesozoic sandstone aquifers in the North German Basin offer significant potential to provide green and sustainable geothermal heat as well as large-scale storage of heat or chill. The determination of geothermal and subsurface heat storage potentials is still afflicted with obstacles due to sparse and partly uncertain subsurface data. Relevant data...
Preprint
Full-text available
Geothermal heat flow is commonly inferred from the gradient of temperature values in boreholes. Such measurements are expensive and logistically challenging in remote locations and, therefore, often targeted to regions of economic interest. As a result, measurements are not distributed evenly. Some tectonic, geologic and even topographic settings a...
Article
Full-text available
We compile and analyze all available geothermal heat flow measurements collected in and around Greenland into a new database of 419 sites and generate an accompanying spatial map. This database includes 290 sites previously reported by the International Heat Flow Commission (IHFC), for which we now standardize measurement and metadata quality. This...
Preprint
Full-text available
We compile, analyse and map all available geothermal heat flow measurements collected in and around Greenland into a new database of 419 sites and generate an accompanying spatial map. This database includes 290 sites previously reported by the International Heat Flow Commission (IHFC), for which we now standardize measurement and metadata quality....
Article
Full-text available
International Journal of Terrestrial Heat Flow and Applied Geothermics 4(1), 2021, 1-14; ISSN: 2595-4180 Periodic revisions of the Global Heat Flow Database (GHFD) take place under the auspices of the International Heat Flow Commission (IHFC) of the International Association of Seismology and Physics of the Earth's Interior (IASPEI). A growing numb...
Article
Full-text available
Understanding the thermal behaviour of non‐steady state subsurface geosystems, when temperature changes over time, requires knowledge on the speed of heat propagation and, thus, of the rock's thermal diffusivity as essential thermo‐physical parameter. Mixing models are commonly used to describe thermo‐physical properties of polymineralic rocks. A t...
Article
Full-text available
The paper addresses the effects of pressure (P) and temperature (T) on thermal conductivity (λ) applied to crustal geotherms. A subset of the ca. 50 experimentally derived numerical P-T relations available in literature for typical crustal rock types was selected for this purpose. The relations comprise those from physical-contact laboratory method...
Presentation
Full-text available
Rund die Hälfte der in Deutschland verbrauchten Energie entfällt auf den Wärmebedarf. Ein Großteil davon muss in urbanen Räumen bereitgestellt werden, für welche eine ortsnahe Energiebereitstellung mit geringen Transportverlusten wünschenswert erscheint. Geothermisch gewonnene Energie hat hier das Potential, eine Grundlastversorgung zu gewährleiste...
Article
Full-text available
Precise knowledge of the subsurface thermal field plays a key role in the assessment of geothermal targets. Unfortunately, deep underground temperature data is generally scarce and a matter of research. To achieve first estimates for subsurface temperatures, steady‑state conductive thermal modeling is commonly applied. Thereby the rock thermal cond...
Article
We present a 3D numerical crustal temperature model with inverse optimisation methodology and analyse the present-day conductive thermal field of the Danish onshore subsurface. The model is based on a comprehensive analysis and interpretation of borehole and well-log data for thermal and petrophysical rock properties and their regional variability...
Conference Paper
Full-text available
The terrestrial heat flow constitutes one of the most important parameters to understand global geodynamic processes. In addition, it is indispensable for temperature models to assess geothermal resources. The German heat-flow data, which are part of the IHFC global heat flow database, date back to the 1970 years. Besides the fact that newer publis...
Poster
Full-text available
Paleoclimatic effects may still influence the present day subsurface temperature distribution and therefore the heat flow density calculated in affected depth levels. Cooling of several degrees Celsius into depths of up to 1.5 – 2 km were reported for areas which were strongly affected by the Pleistocene ice ages (e.g. Canada, Poland, and Denmark)....
Conference Paper
Full-text available
From the Danish "DSF Geotermi project", we present the results of a 4D numerical crustal temperature model conducted to analyze the present-day temperature and heat-flow field of onshore Denmark, including large parts of the Danish Basin, the northernmost part of the North German Basin and the Sorgenfrei-Tornquist Zone. An extensive analysis of bor...
Conference Paper
Full-text available
Genaue Kenntnisse des Verhaltens thermischer Gesteinseigenschaften unter in-situ Temperatur-, Druck-, und Fluidbedingungen sind unabdingbar für eine Reihe von wissenschaftlichen Anwendungen oder technologischen Nutzungen des geologischen Untergrundes (bspw. Geothermie zur Bereitstellung von Wärme-und Strom). In den erbohrbaren und wirtschaftlich nu...
Experiment Findings
Article
Thermal conductivity (λ) is an essential physical property of minerals and rocks and fundamental in constraining the thermal field of the lithosphere. In case that adequate samples to measure λ are not available, it could be indirectly inferred from calculation. One of the most widely applied indirect methods for rocks involve modal mineralogy and...
Data
Citation This data is freely available under a Creative Commons Attribution 4.0 International (CC-BY 4.0) Licence. When using the data please cite is like: Fuchs, Sven; Förster, Hans-Jürgen; Braune, Kathleen; Förster, Andrea (2018): Calculation of thermal conductivity of low-porous igneous rocks from modal mineralogy. GFZ Data Services. This data s...
Presentation
Full-text available
Knowledge of the subsurface temperature field is paramount in the exploration of resources, such as hydrocarbons and geothermal energy. The terrestrial heat flow representing the conductive thermal field is a crucial parameter in such a characterization. It is determined from measured borehole temperature (temperature gradient) and rock thermal con...
Presentation
The disposal of radioactive waste is a topic with huge social importance. Understanding the complex geological, geophysical and geochemical conditions is indispensable for the long-term stability and the safe operation of subsurface nuclear waste repositories, regardless whether they are in salt rock, clay or granitoids. In this context, the subsur...
Article
Detailed knowledge of in situ formation thermal properties is a prerequisite for accurate temperature predictions from geothermal models of sedimentary basins. The value and regional variability of such formation thermal properties generally receive little attention: very few attention in petrophysical and even less in modelling studies. Consequent...
Conference Paper
Full-text available
Accurate knowledge of in-situ thermal rock properties typical for the conditions in the Earth subsurface is indispensable for many applications in Earth science. At drillable depth, the pressure and temperature and thus its effect on rock thermal properties diverge strongly from those measured under ambient conditions in the laboratory. As the majo...
Conference Paper
Full-text available
The Danish subsurface provides a large potential for the use of low-enthalpy geothermal heat and thereby to change the national district heating structure by providing a base load to the system. In the past decade, new exploration and research campaigns have been performed to remove geological, technical and commercial obstacles for a significant u...
Poster
Full-text available
Die Aussagekraft geohydraulischer Berechnungen hängt direkt von der genauen Kenntnis der hydraulischen Gesteinseigenschaften und deren Verteilung im Untergrund ab. Der Porenraum eines Lockergesteins bestimmt mit seinen unterschiedlich wirkenden Anteilen maßgeblich die wirksamen Grundwasserströmungsprozesse. Zur analytischen oder modellgestützten Be...
Experiment Findings
Full-text available
We performed a thermal-modelling scenario analysis in which we demonstrate how the use of both different parameter input type (from literature, lithology and well logs) and parameter input style (constant or spatially varying layer values) affects model temperature predictions in sedimentary basins. To conduct the scenario analysis, rock thermal pr...
Conference Paper
Full-text available
Calculation of geotherms, reflecting steady-state heat conduction, is dependent on surface heat flow, the compositional model of the crust, and its thermo-physical properties, such as thermal conductivity (k) and radiogenic heat production (H). Available global geotherms are afflicted with uncertainties associated with the simplification of the cru...
Conference Paper
Full-text available
Focus on the utilization of geothermal energy as a sustainable energy source has resulted in extensive geothermal exploration activities with a demand for procedures for obtaining reliable information on subsurface temperatures and thermal resources. Subsurface thermal information is basically obtained from two different sources: direct observation...
Conference Paper
Full-text available
The calculation of temperature and heat-flow-density profiles in boreholes requires reliable values of rock thermal conductivity with depth. We developed a new approach for the indirect determination of thermal conductivity from standard geophysical well logs, which massively enlarges the available databases of subsurface rock conductivities beyond...
Article
Full-text available
Translated title: 'Estimation of porosity from hydraulic conductivity and uniformity coefficient: a review' ### This paper comprises a review of the 13 studies that have been proposed for the derivation of porosity, effective porosity and/or specific yield from grain size distributions (Lejbenson 1947; Istomina 1957; Beyer 1964; Hennig 1966; Golf...
Conference Paper
Full-text available
We present a 3D numerical crustal temperature model and analyze the present-day geothermal field of onshore Den-mark, including parts of the Danish Basin, the northernmost part of the North German Basin and the Sorgenfrei-Tornquist Zone. An extensive analysis of borehole and well-log data on a basin scale is conducted to derive the model parameteri...
Conference Paper
Full-text available
Knowledge of structural, hydraulic and thermal conditions of the subsurface is fundamental for the planning and use of hydrothermal energy. In the framework of a project under the Danish Research program 'Sustainable Energy and Environment' funded by the 'Danish Agency for Science, Technology and Innovation', fundamental geological and geophysical...
Conference Paper
Full-text available
Die Aussagekraft numerischer Temperaturmodelle für geodynamische oder nutzungsbezogenen Analysen der Erdkruste hängt direkt von der genauen Kenntnis der thermischer Gesteinseigenschaften im Untergrund ab. Üblicherweise werden diese an Gesteinsproben im Labor bestimmt, was die Verfügbarkeit der Messergebnisse auf wenige gekernte Bohrungsabschnitte b...
Article
Full-text available
We present a 3D numerical crustal temperature model and analyse the present-day conductive thermal field of the Danish-German border region. The model region covers the northernmost part of the North German Basin, a transition zone between the deep-reaching sedimentary rocks of the Glückstadt Graben (including complex salt structures) and the shall...
Article
Full-text available
The subsurface temperature field and the geothermal conditions in sedimentary basins are frequently examined by using numerical thermal models. For those models, detailed knowledge of rock thermal properties are paramount for a reliable parameterization of layer properties and boundary conditions. Despite the state-of-the-art in other research fiel...
Conference Paper
Full-text available
Numerical temperature models generated for geodynamic studies as well as for geothermal energy solutions heavily depend on rock thermal properties. Best practice for the determination of those parameters is the measurement of rock samples in the laboratory. Given the necessity to enlarge databases of subsurface rock parameters beyond drill core mea...
Conference Paper
Full-text available
We present a regional 3D numerical crustal temperature model and analyze the present-day conductive thermal field of the Danish-German border region located in the North German Basin. A comprehensive analysis of borehole and well-log data on a regional scale is conducted to derive both the model parameterization with a spatial distribution of rock...
Conference Paper
Full-text available
Information on both hydraulic and thermal conditions of the subsurface is fundamental for the planning and use of hydrothermal energy. This is paramount in particular for densely populated international border regions, where different subsurface applications may introduce conflicts of use and require reliable cross-border management and planning to...
Article
Full-text available
In this study, equations are developed that predict for synthetic sedimentary rocks (clastics, carbonates and evapourates) thermal properties comprising thermal conductivity, specific heat capacity and thermal diffusivity. The rock groups are composed of mineral assemblages with variable contents of 15 major rock-forming minerals and porosities of...
Presentation
Full-text available
Das INTERREG IVa Projekt GeoPower hatte zum Ziel, Planungsgrundlagen für die Nutzung hydrothermaler Energie für das nördliche Schleswig-Holstein und das südliche Jütland (Dänemark) zu schaffen. Projektpartner waren die Geologischen Dienste von Dänemark und Grönland (GEUS) und Schleswig Holstein (LLUR) sowie die geowissenschaftlichen Institute der U...
Conference Paper
Full-text available
The bulk thermal conductivity (TC) of 26 rock samples representing felsic, intermediate and mafic granulites, from the Southern Granulite Province, India, is measured at dry and saturated conditions with the optical-scanning method. Thermal conductivity is also calculated from modal mineralogy (determined by XRD and EPMA), applying mixing models co...
Conference Paper
Full-text available
Temperature-depth models developed in geothermal exploration are usually constrained by values of observed surface heat flow and the thermal conductivity of rocks. In several areas, in particular in the northern hemisphere, regional geothermal studies have shown that the subsurface temperatures and temperature gradients may be overprinted by the lo...
Conference Paper
Full-text available
Most of the Danish area is characterized by deep sedimentary basins with a great potential for exploitation of geothermal energy. Geothermal reservoirs are present at various depths and temperatures. Currently, three geother-mal plants are operating producing warm water for district heating purposes. Information of subsurface temperature distributi...
Conference Paper
Full-text available
Thermal modelling is used to examine the subsurface temperature field and geothermal conditions at various scales (e.g. sedimentary basins, deep crust) and in the framework of different problem settings (e.g. scientific or industrial use). In such models, knowledge of rock thermal properties is prerequisites for the parameterisation of boundary con...
Article
Full-text available
Fuchs, S. (2015): Kommentar zu „Ableitung von Korngrößenverteilungen aus textbasierten petrografischen Bohrgutbeschreibungen“ von Michael Naumann, Anja Waldeck, Wolfgang Poßin, Carsten Schwarz & Joachim Fritz (Z. Dt. Ges. Geowiss., 165/2: 275?286). [Comment on “Deduction of grain size distributions based on petrographic borehole descriptions” by Mi...
Article
Full-text available
In this study, the bulk thermal conductivity (TC) of 26 rock samples representing different types of granulite-facies rocks, i.e., felsic, intermediate and mafic granulites, from the Southern Granulite Province, India, is measured at dry and saturated conditions with the optical-scanning method. Thermal conductivity is also calculated from modal mi...
Technical Report
Full-text available
Ziel des Projektes GeoPower ist es, verbesserte geologische Planungsgrundlagen für die Nutzung geothermischer Energie in der INTERREG-Region Südjütland - Schleswig zu erstellen und öffentlich verfügbar zu machen. Die effektivste Nutzung der Erdwärme erfolgt hydrothermal, d.h. durch die Förderung von heißem Tiefenwasser. Geologische Voraussetzung is...
Poster
Full-text available
Information of subsurface temperature distribution in the Danish area originates from direct measurements in boreholes and from indirect theoretical modelling. “Point observations” of varying quality are available as industrially measured “Bottom Hole Temperatures” from deep exploration boreholes, and accurate continuous equilibrium temperature log...
Conference Paper
Full-text available
Die Erstellung eines hydrogeologischen Models ausschließlich auf Basis von Bohrungsinformationen ist ein gleichermaßen häufig anzutreffende, wie auch besondere Herausforderung hinsichtlich der hydraulischen Parametrisierung der Modelschichten (i.e. bei fehlenden hydraulischen Testdaten). Am Beispiel des Naturschutzgebietes „Heiliges Meer“, welches...
Conference Paper
Full-text available
The calculation of heat-flow density in boreholes requires reliable values for the change of temperature and rock thermal conductivity with depth. As rock samples for laboratory measurements of thermal conductivity (TC) are usually rare geophysical well logs are used alternatively to determine TC. A common procedure in the latter approach is the us...
Conference Paper
Full-text available
Temperature-depth distributions are pivotal in subsurface studies in academia as well as in georesources applications. In this regard, high-resolution temperature profiles, logged under equilibrium thermal borehole conditions, are the ultimate measure. However there are circumstances in which these measurements are not available or only measured to...
Article
Full-text available
Data on rock thermal conductivity (TC) are important for the quantification of the subsurface temperature regime and for the determination of heat flow. If drill core is not retrieved from boreholes and thus no laboratory measurement of TC can be made, other methods are desired to determine TC. One of these methods is the prediction of TC from well...
Thesis
Full-text available
URN: urn:nbn:de:kobv:517-opus-67801 URL: http://opus.kobv.de/ubp/volltexte/2013/6780/ In sedimentary basins, rock thermal conductivity can vary both laterally and vertically, thus altering the basin’s thermal structure locally and regionally. Knowledge of the thermal conductivity of geological formations and its spatial variations is essential, no...
Conference Paper
Full-text available
Rock thermal conductivity (TC) is paramount for the determination of heat flow and the calculation of temperature profiles. Due to the scarcity of drill cores compared to the availability of petrophysical well logs, methods are desired to indirectly predict TC in sedimentary basins. Most of the well-log-based approaches published require informatio...
Article
Full-text available
This study predicts the subsurface temperature distribution of Germany’s capital Berlin. For this purpose, a data-based lithosphere-scale 3D structural model is developed incorporating 21 individual geological units. This model shows a horizontal grid resolution of (500 × 500) m and provides the geometric base for two different approaches of 3D the...
Conference Paper
Full-text available
The thermal conductivity (TC) of a rock is, in collaboration with the temperature gradient, the basic parameter to determine the heat flow from the Earth interior. Moreover, it forms the input into models targeted on temperature prognoses for geothermal reservoirs at those depths not yet reached by boreholes. Thus, rock TC is paramount in geotherma...
Conference Paper
Full-text available
To characterize the temperature regime in a sedimentary basin, knowledge of the rock thermal conductivity (TC) is vital. This also pertains to temperature prognosis for geothermal target reservoirs based on modelling, which in turn requires an assignment of TC values to model units. Those model units can consist of single lithotypes but are mostly...
Conference Paper
Full-text available
In the light of an aspired reduction of CO2 emissions for Germany’s capital Berlin, one possible alternative for meeting the city’s growing energy demands lies in deep geothermal energy. To minimise exploration risks, a profound knowledge about the subsurface temperature distribution is indispensable. We present a 3D structural model that is used f...
Conference Paper
Full-text available
In order to show the impacts of natural internal fault zones and well design on geothermal energy production, two main deep geothermal reservoir sites in Germany, Groß Schönebeck (GrSk) and Berlin Tempelhof which are part of the North German Basin (NGB) are investigated. Groß Schönebeck is located at about 40km away from the Berlin centre whereas B...
Article
Different numerical models can be deployed to calculate the matrix thermal conductivity of a rock from the bulk thermal conductivity (BTC), if the effective porosity of the rock is known. Vice versa, using these parameters, the BTC can be determined for saturation fluids of different thermal conductivity (TC). In this paper, the goodness-of-fit bet...
Conference Paper
Full-text available
Die geothermische Wärme des Tiefengesteins stellt ein großes Energiepotential dar, welches in Deutschland heute noch weitgehend unerschlossen ist. Dieser Beitrag behandelt Fragestellungen zur Erschließung dieses Potentials speziell im Nord-Ostdeutschen Becken. In den Gesteinporen der Tiefengesteine dieses Gebiets liegt heißes Thermalwasser vor, des...
Article
Full-text available
Original research article: Matthes et al. (2012) http://link.springer.com/article/10.1007/s00767-012-0191-3 My comment: Fuchs et al. (2013) http://link.springer.com/article/10.1007%2Fs00767-012-0216-y Response to comment: Vienken et al. (2013) http://link.springer.com/article/10.1007/s00767-012-0215-z
Conference Paper
Full-text available
An adequate comprehensive understanding of the subsurface geology is a pre-requisite for a precise planning and successful operating of geothermal applications and reduces the financial risks considerably. An exploration concept is needed which is tailored for the geological setting to be evaluated and the level of exploration performed prior to th...
Conference Paper
Full-text available
Thermal properties of rocks are first-order controls on the thermal structure of sedimentary basins. Reliable basin models therefore need to be based on credible in situ thermal conductivity values. Until today, no cost-efficient method for in-situ borehole measurements of thermal conductivity exists, and drill core samples on which thermal conduct...
Conference Paper
Full-text available
The use of geothermal energy from the deeper subsurface is confronted with two major questions: (1) at what depth occur the temperatures necessary and (2) what are the hydraulic (porosity/permeability) and thermal properties at that depth. The hydraulic parameters also are responsible for the type of geothermal use, whether it is “hydrothermal” (pu...