Abstract
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 m3/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 analysis 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 m3/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.
Highlights
Recognition of geological structures for direct and indirect use of geothermal energy is an important step in applied geological research
Fundamental issues are, for instance, geothermal potential estimates assisted by numerical modelling (Szczepański & Szklarczyk, 2006) and analysis of geochemical composition of groundwaters in the context of scaling and corrosion prediction in geothermal systems
The top of the Lower Jurassic strata rises to the marginal parts of the Szczecin Trough to a depth of –300 m a.s.l. and drops in the central part, reaching a maximum depth of –2500 m a.s.l. in the vicinity of Chociwel (Sowiżdżał, 2009)
Summary
Recognition of geological structures for direct and indirect use of geothermal energy is an important step in applied geological research. One of the most promising geothermal reservoirs in terms of using geothermal waters for energy purposes is the Lower Jurassic unit within the Szczecin Trough (Górecki et al, 2006, 2010; Sowiżdżał, 2009, 2010; Górecki et al, 2010; Tarkowski & Wdowin, 2011; Sowiżdżał et al, 2013). The top of the Lower Jurassic strata rises to the marginal parts of the Szczecin Trough to a depth of –300 m a.s.l. and drops in the central part, reaching a maximum depth of –2500 m a.s.l. in the vicinity of Chociwel (Sowiżdżał, 2009). A preliminary assessment of geothermal conditions of the Szczecin Trough have allowed to nominate the Chociwel region (3.5 thousand inhabitants, Stargard county, West Pomeranian Voivodeship) as a prospective area for use of geothermal energy in the energy sector
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