Abstract
File replaced 2022–02–24: Erroneous stratigraphic levels in figures 8, 9, 10 and 11 of the original publication are now correct Heat storage in the Danish subsurface is gaining increasing interest for optimiz-ing the use of energy resources, but no deep heat storage facilities have yet been established. As an analogue we study the Gassum Formation in the Stenlille structure that is presently used for gas storage. This allows us to discuss geological and technical characteristics of an aquifer relevant for heat storage in Denmark. We develop a 3D model for a high-temperature aquifer thermal energy storage sys-tem using analysis of geological core data, sedimentological description, geophysi-cal data including well logs and seismic lines, as well as a finite difference model to calculate the recovery efficiency, heat storage capacity and thermal breakthrough time. Based on geostatistical methods we made three realisations and found similar results for the three cases. In accordance with results from published simplified models we found a high recovery efficiency of 70% after 4 years and 69% after 20 years, a high heat storage capacity of 1.8×1018 J, and a long thermal breakthrough time of 66–77 years. These results reflect the excellent reservoir properties of the Gassum Formation in Stenlille, characterised by a uniformly layered sand/shale sedimentology, a high average porosity of 25% and a high permeability of 1000 to 10 000 mD of sandstone intervals.
Highlights
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Summary
The Bulletin publishes contributions of international interest in all fields of geological sciences on results of new work on material from Denmark, the Faroes and Greenland. Contributions based on foreign material may be submitted to the Bulletin if the subject is relevant for the geology of the area of primary interest. The rate of publishing is one volume per year. All articles are published as pdf-files immediately after acceptance and technical production. Scientific editing and reviewing are done on an unpaid collegial basis; technical production expenses are covered by the membership fees. The bulletin is freely accessible on the web page of the Geological Society of Denmark: www.2dgf.dk/publikationer/bulletin/index.html See this volume pp. 171–193: Winsløw, L.B., Pedersen, S.A.S., Boldreel, L.O. & Nørmark, E.: Wrench-fault structures superimposed by glaciotectonic complexes, interpreted from high-resolution reflection-seismic sections and boreholes along the western bank of Esrum Sø, north-east Sjælland, Denmark
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