Modelling geothermal conditions in part of the Szczecin Trough – the Chociwel area
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Date
2015-09
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Publisher
Instytut Geologii UAM
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Abstract
The Chociwel region is part of the Szczecin Trough and constitutes the northeastern segment of the extended Szczecin-
Gorzów Synclinorium . Lower Jurassic reservoirs of high permeability of up to 1145 mD can discharge geothermal
waters with a rate exceeding 250 m 3 /h and temperatures reach over 90°C in the lowermost part of the reservoirs. These
conditions provide an opportunity to generate electricity from heat accumulated in geothermal waters using binary
ORC (Organic Rankine Cycle) systems. A numerical model of the natural state and exploitation conditions was created
for the Chociwel area with the use of TOUGH2 geothermal simulator (i.e., integral finite-difference method). An anal-
ysis of geological and hydrogeothermal data indicates that the best conditions are found to the southeast of the town
of Chociwel, where the bottom part of the reservoir reaches 3 km below ground . This would require drilling two new
wells, namely one production and one injection. Simulated production with a flow rate of 275 m 3 /h, a temperature of
89°C at the wellhead, 30°C injection temperature and wells being 1.2 km separated from each other leads to a small
temperature drop and moderate requirements for pumping power over a 50 years’ time span. The ORC binary system
can produce at maximum 592.5 kW gross power with the R227ea found as the most suitable working fluid. Geothermal
brine leaving the ORC system with a temperature c. 53°C can be used for other purposes, namely mushroom growing,
balneology, swimming pools, soil warming, de-icing, fish farming and for heat pumps.
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Keywords
Szczecin Trough, geothermal conditions, numerical model, binary system, ORC
Citation
Geologos, 2015, 21, 3. s.187-196
ISBN
978-83-232187-4-6