The Prospects of Thermal Water Exploration in Ukraine

Abstract:

The total resources of geothermal energy in Ukraine up to the depth of 10 km are estimated at 10²² J, which significantly exceeds the reserves of fossil fuel sources. Nevertheless, geothermal exploration in each specific case requires comprehensive thermodynamic and feasibility studies taking into account local geological, hydrogeological conditions, and depth ranges. To facilitate such kind of studies an analysis has been made for Ukraine’s territory with the identification of aquifers that can be potentially used including the Transcarpathian trough, the Volyn-Podil’ska plate, the Dnipro-Donets depression, and Black Sea coast area. Regarding high thermal water mineralization a geo-technological scheme has been justified for environmentally safe exploration that suggests a closed cycle including (i) pumping out water to the surface, (ii) heat extraction, and (iii) re-injection of water into the aquifer. A mathematical model developed to evaluate the geo-circulation system effectiveness for various conditions allows predicting the changes in water temperature during circulation, power consumption, and heat capacity. Besides, the model enables optimizing the system performance depending on pumped water temperature. We assessed the effectiveness of geothermal heat extraction with the geo-circulation system in terms of profitability and net the present value (NPV). According to the estimations made for aquifers in Ukraine the geo-circulation system can be operated with the positive NPV in many regions of the country depending on the aquifer depth, heat flux, and groundwater flow. The obtained results correlate to the world standards of rational exploitation of geothermal energy.

• Periodical: Advanced Engineering Forum (Volume 25)
• Pages: 28-34
• DOI: https://doi.org/10.4028/www.scientific.net/AEF.25.28
• Online since: November 2017
• Authors: Ivan Sadovenko*, Dmytro Rudakov, Oleksandr Inkin
• Keywords: Aquifer, Effectiveness, Geo-Circulation System, Geothermal Energy Exploration, Pumping

References

[1] Makarenko, P.N., Dyachenko, A.S. (2011). Perspectives of geothermal energy application in Ukrainian agro-industrial complex, Economy of agroindustrial complex, No. 16, pp.14-16.

[2] National Atlas of Ukraine (2007). SSPE Cartography.

[3] Gordienko, V.V., Gordienko, I.V., Zavgorodniy, O.V., Usenko, O.V. (2002). Thermal field of the territory of Ukraine. Kyiv, Knowledge of Ukraine.

[4] Kutas, R.I. (2014). Heat flow and geothermal models of the Earth's crust of Ukrainian Carpathians, Geophysical Journal. No. 6, pp.3-27.

[5] Ruzin, L.M. (2009). Development of oil fields with the use of thermal effects on the reservoir. Ukhta, USTU, 39 p.

[6] Oradovskaya, A.E., Lapshin, N.N. (1987). Sanitary protection of ground water intakes, Moscow, Nedra.

[7] Alsakhov, A.B. (2012). Renewable energy. Moscow, Fizmatlit.

[8] Gidulyanov, V.I., Khlopotov, A.B. (2003). An analysis of the methods for estimating capital investments. Moscow. Publ. of Moscow State University.