Temperature Monitoring of Injection Tests in the Litoměřice Geothermal Borehole

The pilot 2.1 km deep geothermal borehole LT-1 in Litoměřice (NW part of Bohemian Massif) was a subject of injection tests aimed at assessing the reservoir hydraulic characteristics of the rock massif. In the first stage carried out in January 2020, 25 cubic meters of water were injected to the open hole section of the borehole. Seismic monitoring using a dense array of stations did not indicate any induced seismicity. The flow in the hole was monitored using the distributed temperature sensing (DTS) methodology, which allowed for clear identification of permeable structures. We show the first results of data processing, numerical simulation and interpretation of the hydraulic and DTS monitoring data and discuss the prospects of further development of this pilot EGS test site.