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Defining, exploring, imaging and assessing reservoirs for potential heat exchange - Potsdam, Germany, Workshop1
Defining, exploring, imaging and assessing reservoirs for potential heat exchange - Potsdam, Germany, Workshop1
6-8 November 2006 GeoForschungsZentrum Potsdam (GFZ)
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MILOS SITE (GREECE): INTEGRATION AND EVALUATION OF EXPLORATION DATA
 
In Milos island, Cyclades Greece, geothermal exploration includes geological 
mapping, mapping thermal manifestations, mapping temperature gradients by 
temperature measurements within shallow wells, DC-Schlumberger resistivity 
soundings, geochemical surveys, gravity mapping, SP and magnetic surveys, MT and 
AAMT soundings, and drilling of the 5 deep wells. The geology of the island 
includes from top to bottom lavas, alluvia deposits, volcanic products (tuffs, 
hydrothermally altered tuffs, lahars and breccias), neogene sediments and the 
metamorphic basement (schists). The gravity survey indicated that the top of the 
basement is located deeper at depths 600-800m around the bay of Milos. The thermal 
manifestations, as well as geochemical and passive microseismic surveys indicate 
the presence of an active deep hydrothermal system beneath the east and the south-
central-east parts of the island. Geothermal gradients and earlier DC soundings 
pointed at Zefyria plain, the south-central-east part of Milos and Adamas as the 
most promising areas for production drilling, area which was further broadened by 
MT and AAMT soundings. Passive seismic surveys indicated that the hydrothermal 
system extends down to 5km through a system of active faults and fracture zones. 
The magnetic survey, hydrothermal alterations and some geochemical data indicate 
that the west part of the island is also of geothermal interest, but no deep wells 
have been drilled there yet. Drilling with many shallow and five deep wells proved 
the existence of the following three main types of fluids for geothermal 
exploration: (a) low enthalpy (up to 100°C) shallow water table in areas of high 
temperature gradient, (b) 100-250°C water within the neogene sediments in places 
where it is present at sufficient depth and has enough thickness, and (c) high 
enthalpy pressurized water of 300-325°C temperature within the faults and fracture 
zones of the basement at depths between 1-5 km.
 
Id: 2
Place: GeoForschungsZentrum Potsdam (GFZ)
14473 Potsdam, Telegrafenberg
Germany
Starting date:
07-Nov-2006   10:00
Duration: 03'
Contribution type: Poster
Primary Authors: Mr. MENDRINOS, DIMITRIOS (GEOTHERMAL DEPT. CRES)
Co-Authors: Dr. KARYTSAS, CONSTANTINE (HEAD GEOTHERMAL DEPT. CRES)
Presenters: Dr. KARYTSAS, CONSTANTINE
Material: slides Slides
poster Poster
 




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