The geothermal energy potential in Denmark - reservoir properties, temperature distribution and models for exploitation

The Danish sedimentary basins contain huge amounts of green energy in the form of geothermal resources that can be utilized as warm water for heating purposes. The objective of this research was to carry out a nationwide, regional study of those geological and geophysical characteristics which are essential for assessing the potential for geothermal energy utilization. New seismic interpretations, seismic mapping and development of a three-dimensional subsurface geological model, a three-dimensional subsurface thermal model, analysis of reservoir rocks and geophysical borehole data as well as numerical modelling studies have generated extensive new knowledge on the geothermal reservoirs with respect to their regional distribution, physical properties, temperature and energy content. This information is suitable for illustration in a new WebGIS system and forms the basis for an initial general assessment of where exploitation possibilities exist. Promising geothermal reservoirs are found in most of the country, including the region of greater Copenhagen. Along with other experiences, project results show where to follow up locally with more detailed geological and geophysical surveys, and how there is a need for new research on specific issues to ensure a stable and long-term sustainable energy production.