Field hydrogeophysical investigations (hydraulic testing, hydraulic and microtem-perature observations) provided sufficient information for the development of a conceptual thermo-hydrodynamical models of the Tibilisi and Lisi deposits [4]. Their subsequent conversion to numerical models provided a means for simulating the regional fluid and energy balance; identify areas for exploitation; and evaluate alternative exploitation scenarios. Simulations confirmed that decreasing thermal waters occurs due both to exploitation and global climate change processes. Also, the combination of 10 more years of Tbilisi deposit exploitation under current climate change will result in cooling with a tendency for subsidence. To mitigate these effects, we recommend the creation and implementation of a geothermal circulation system. This system will help achieve economical and ecologically reasonable exploitation of our geothermal resources.

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