| Title | Low Enthalpy Geothermal Fields in the Strymon Basin (Northern Greece) |
|---|---|
| Authors | G. Karydakis, A. Arvanitis, N. Andritsos, M. Fytikas |
| Year | 2005 |
| Conference | World Geothermal Congress |
| Keywords | Geothermal, fields, Greece, Strymon basin, exploration, exploitation |
| Abstract | The basin of Strymon is a typical post-orogenic graben with geothermal interest. It lies in the region of Eastern Macedonia (Northern Greece). The total thickness of the Neogene - Quaternary sediments of the graben is estimated to be 4000 m. Some important geothermal fields exist in the Strymon basin (fields of Nigrita, Sidirokastro, Lithotopos - Iraklia, Agistro and Ivira - Achinos). The temperature of the waters ranges from 40 to 74oC and they come from relatively shallow depths (50-650 m). The geothermal anomaly occurs mainly due to deep fault systems, which are normal and strike-slip structures. The majority of the waters are classified as Na-HCO3 type with TDS 0.3-2.5 g/l (low salinity). Furthermore, the waters of the Nigrita field are rich in CO2 (about 3.7 kg/m3 water). The exploitation of geothermal energy is limited to greenhouses heating (Nigrita and Sidirokastro), balneology and bathing pools (Nigrita, Sidirokastro, Agistro), culture of the microalga Spirulina (Nigrita) and subsurface heating for asparagus cultivation (Nigrita). In the areas of Lithotopos - Iraklia and Ivira - Achinos the geothermal research is still ongoing (some interesting exploration boreholes have been drilled). In this paper, the geological and geothermal conditions of the various fields in the Strymon basin are reviewed. Furthermore, the corrosion and scaling tendencies of the geothermal waters from the basin were assessed. |