Multidiciplinary field measurements for a High Temperature Energy Storage site (HT-BTES) at Linköping Sweden
Mikael Erlstroem (SGU), 22 April 2021
The heat storage at Linköping aims to shift around 50 MWh excess heat from a waste incineration plant during the summer to the winter season. The storage design includes up to 1500 wells to 300 m depth in the crystalline basement. The performance and economic feasibility rely strongly on the geological prerequisites such as fracturing, ground water conditions, thermal properties, and Quaternary overburden. To get a high level of confidence on the geological conditions is a challenging task and requires a toolbox with various methods.
The MUSE project has allowed us, during three field visits in 2019 and 2020, to test the applicability of various geophysical methods in an around 2 km2 large area at Linköping. Ground geophysical surveys with magnetometer and VLF combined with borehole investigations, including TRT and DTRT measurements, geophysical wireline logging, thermal conductivity measurements and mapping of fractures with drones have been tested (fig. 1 & 2).
The overall aims have been:
- to evaluate the applicability of different field methods, not typically applied in pre-investigations,
- to exemplify how multi-disciplinary pre-investigations can support the placing and design of a HT-BTES system,
- to provide guidance on how and what type of geological information is possible to select for a large-scale geothermal system in a crystalline bedrock setting.
The magnetometry and VLF surveys, in combination with fracture mapping and analysis of the thermal conductivity, have proven cost-efficient methods to map different rock types, fracture zones and orientation of fractures (fig. 3 & 4). The results have provided guidance to a favourable location of the HT-BTES within the pilot area (fig. 4). An important outcome is also that a pre-investigation strategy based only on scattered well observations is inadequate when assessing large scale HT-BTES systems in anisotropic crystalline bedrock. The study has proven that a toolbox with various tested methods give prerequisites for a tailored pre-investigation strategy related to the geological setting and system requirements.
Find out more about the pilot area Linköping in our previous blog: Pilot area activities – #2 Geological and geophysical surveys in Linköping, Sweden
Other MUSE Posts:
- MUSE pilot area activities – RESULTS – #1 Ljubljana
- Brand-new MUSE results: Fact sheets on shallow geothermal energy concepts
- Explore the new MUSE YouTube channel
- MUSE co-organized the Shallow Geothermal Days 2020
- MUSE – Monitoring Closed-loop systems and Open-loop systems
- MUSE – Geothermal heat pumps, a highly dynamic market in Europe!
- MUSE and the underground urban heat island effect
- MUSE – Open-loop systems requirements & advantages
- MUSE – Web-based information systems for shallow geothermal energy
- MUSE – Closed-loop systems requirements & advantages
- MUSE results published in Energy Policy
- MUSE – Differences between deep and shallow geothermal energy
- Legal framework, procedures and policies of shallow geothermal energy use in the EU and MUSE partner countries
- BBC article about MUSE activities in Cardiff
- Pilot area activities – #14 Assessment of shallow geothermal energy resources in Warsaw agglomeration, Poland
- Pilot area activities – #13 Geophysical survey and groundwater monitoring in Brussels, Belgium
- MUSE at “EGU2020: Sharing Geoscience Online” – Free online geoscience conference
- Pilot area activities – #12 Thermal groundwater use in the urbanized area of Zagreb, Croatia