The Nestos Delta geothermal field and its relation to the associated self potential (SP) field

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Geothermics (International Journal of Geothermal Research and its Applications); (United States)

DOI:https://doi.org/10.1016/0375-6505(93)90051-N· OSTI ID:7368798

Thanassoulas, C; Lazou, A ^[1]

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1. Inst. of Geology and Mineral Exploration, Athens (Greece)

Prospecting for geothermal reservoirs by geophysical methods has proved to be a challenge in recent years. In the case of Nestos geothermal field, considered to be a blind field (no surface manifestation), the geological and geophysical data were studied and intercorrelated. The geophysical results from SP, gravity, and VES data were compared with basement morphology and tectonics, as well as with the high temperatures measured in the area of main geothermal interest. As a result, the highly conductive subsurface zone and high temperatures observed on the ground surface were closely associated with a specific fracturing system. The latter was successfully mapped by the SP method. The SP method also defined certain fracture zones which, being highly electrically polarized, are hypothesized as future geothermal targets. All existing geophysical data have been re-evaluated, along with the SP data acquired over the geothermal field, and compared with the thermal contour maps and regional tectonics of the area. A deep borehole, drilled earlier in the area of the geothermal field, detected high temperatures in the basement (115[degree]C), but very low flowrate of the geothermal fluids. According to the results of this study, this is due to the fact that the borehole was located outside the area of the main fracture zones of geothermal interest.

• OSTI ID: 7368798
• Journal Information: Geothermics (International Journal of Geothermal Research and its Applications); (United States), Journal Name: Geothermics (International Journal of Geothermal Research and its Applications); (United States) Vol. 22:2; ISSN GTMCAT; ISSN 0375-6505
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150301* -- Geothermal Exploration & Exploration Technology-- Geophysical Techniques & Surveys
BASEMENT ROCK
BOREHOLES
CAVITIES
CHEMISTRY
DATA
DEVELOPING COUNTRIES
ELECTRIC LOGGING
EUROPE
EVALUATED DATA
EXPLORATION
FLOW RATE
FLUIDS
GEOCHEMISTRY
GEOLOGIC FRACTURES
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
GEOLOGY
GEOMORPHOLOGY
GEOPHYSICAL SURVEYS
GEOTHERMAL EXPLORATION
GEOTHERMAL FIELDS
GEOTHERMAL FLUIDS
GEOTHERMAL SYSTEMS
GRAVITY SURVEYS
GREECE
INFORMATION
MAPPING
NUMERICAL DATA
RESERVOIR TEMPERATURE
SP LOGGING
SURVEYS
TECTONICS
WELL LOGGING