Kizilcahamam is a low temperature (~ 70C) geothermal field located 70 km far from Ankara, Turkey. The produced geothermal water is used to heat more than 2500 houses. In order to characterize the reservoir a tracer-test was planned using the efficient hydrologic tracer-test design technique. The test was carried out by injecting a slug of fluorescein from a shallow re-injection well. The analysis results showed that the injection well and the producers are interconnected. Analysis of time-concentration curves showed that multi-fracture model represented the multi-peaked curves better than the others including homogeneous porous and double porosity models. The results are consistent with the conceptual geological models proposed in the literature.

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