Hydraulic injection tests in the pilot EGS borehole PVGT-LT1 in Litoměřice, Czechia
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F23%3A00576144" target="_blank" >RIV/67985891:_____/23:00576144 - isvavai.cz</a>
Alternative codes found
RIV/67985530:_____/23:00576144 RIV/00216208:11310/23:10475859 RIV/00025798:_____/23:10168920
Result on the web
<a href="https://doi.org/10.1016/j.geothermics.2023.102805" target="_blank" >https://doi.org/10.1016/j.geothermics.2023.102805</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.geothermics.2023.102805" target="_blank" >10.1016/j.geothermics.2023.102805</a>
Alternative languages
Result language
angličtina
Original language name
Hydraulic injection tests in the pilot EGS borehole PVGT-LT1 in Litoměřice, Czechia
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10507 - Volcanology
Result continuities
Project
<a href="/en/project/EF16_013%2F0001792" target="_blank" >EF16_013/0001792: RINGEN - Research Infrastructure Upgrade</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geothermics
ISSN
0375-6505
e-ISSN
1879-3576
Volume of the periodical
115
Issue of the periodical within the volume
DEC
Country of publishing house
GB - UNITED KINGDOM
Number of pages
12
Pages from-to
102805
UT code for WoS article
001076550400001
EID of the result in the Scopus database
2-s2.0-85168993645