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• W4386269010 endingPage "102805" @default.
• W4386269010 startingPage "102805" @default.
• W4386269010 abstract "Successful utilization of geothermal energy is conditioned by sufficient permeability of the rock formation as a heat exchanger. We present results of hydraulic injection tests carried out in 2020 in the pilot geothermal borehole PVGT-LT1 in Litoměřice, Czech Republic, which samples 800 m of Paleozoic and Mesozoic sediments on the top of a crystalline basement. The low hydraulic conductivity on the order of 10−11 m/s obtained by recovery tests was verified by large-scale injection tests monitored by DTS temperature logging. During the first test, 24 m3 of water were injected and a permeable fracture was created at 880 m depth, breaking through the ignimbrite layer. The opening pressure of 12.55 MPa corresponds to the lower estimate of the minimum stress at this depth. The second injection was performed 7 months later and 202 m3 were injected at flow rates reaching 50 l/min. It showed that the fracture had been preserved since the first injection, which was documented by a non-zero flow rate at the smallest injection pressures and also by a stabilized water level in the borehole, which dropped immediately after the fracture formation. No induced seismicity accompanied the injection, which indicates a possibly low seismogenic potential of this area of the Bohemian Massif. The model of finite conductive fracture fitted to the pressure decay curve during shut-in intervals gives an estimate of a fracture half-length exceeding 100 m." @default.
• W4386269010 created "2023-08-31" @default.
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• W4386269010 date "2023-12-01" @default.
• W4386269010 modified "2023-10-14" @default.
• W4386269010 title "Hydraulic injection tests in the pilot EGS borehole PVGT-LT1 in Litoměřice, Czechia" @default.
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• W4386269010 doi "https://doi.org/10.1016/j.geothermics.2023.102805" @default.
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