Geothermal Exploration in Greece
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1 Geothermal Exploration in Greece D. Mendrinos, O.Polyzou and C. Karytsas Centre for Renewable Energy Sources
2 Geothermal exploration in Greece Started in the 70 s by IGME, PPC for high enthalpy fields for power generation Extended to low enthalpy fields in the 80 s for agricultural applications Schlumberger resistivities many areas of geothermal interest all over the country
3 Active hydrothermal system maintained by Pleistocene volcanic activity C C boiled seawater at km Milos island Geology Alluvia / volcanic products Altered tuffs Neogene sediments Metamorphic basement Schlumberger resistivities Five deep wells A few houses / hotels
4 Active hydrothermal system maintained by Holocene and recent volcanic activity High enthalpy boiled seawater at 1+ km Geology Volcanic products Metamorphic basement (limestones) Schlumberger resistivities Gravity / magnetic survey A few shallow boreholes none Santorini island
5 Nisyros island Active hydrothermal system maintained by Pleistocene volcanic activity C boiled seawater at km C C at shallow depth Geology Volcanic products Metamorphic basement (limestones) Schlumberger resistivities Two deep wells none Nisyros conceptual model by Swiss Federal Institute of Technology (ETHZ)
6 Lesvos island Medium enthalpy hydrothermal systems heated by Miocene volcanism C saline water at 1+ km Deeper drilling Greenhouses & spas (1) Pliocene-Quaternary marine and continental sediments, (2) Miocene volcanic rocks, (3) ophiolitic basement, (4) carbonate-phyllite basement, (5) cold water, (6) thermal water, (7) thermal water with associated gas phase
7 Chios island C boiled seawater Medium enthalpy hydrothermal systems heated by Miocene volcanism none
8 Medium enthalpy hydrothermal systems heated by Miocene volcanism Samothraki island >100 C C saline water spas andesites * alluvia neogene sediments porphyrites basalts, gabbros andesites porphyrites alluvia granites basalts, gabbros
9 Alexandroupolis Basin High heat flow basin (Oligocene / lower Miocene volcanism) C C meteoric water at 1,5-2 2 km area/well depth Aristino : Tychero : 400 C Spas & space heating
10 High heat flow basins C C meteoric water at km area/well depth N.Kessani : Sappes : L.Mitrikou : 450 Magana : Eratino : Nestos Basin and Xanthi/Komotini Basin C Local Schlumberger Resistivities Greenhouses, soil heating, fish farming, space heating & spas
11 Strymon Basin High heat flow basin C C meteoric water at km area/well depth Agistro : Sidirokastro : Iraklia : Nigrita : Ivira : SG-1&2 : 500 STR-2&3 : STR-1 : C Greenhouses, agricultural & spas
12 Other Basins High heat flow basins Basin SiO 2 or K/Mg temperature Mygdonia C Anthemous C Aridea C Sperchios C Spas & greenhouses
13 Thank you for your attention
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