Title:

Discovering a New Buried Geothermal Field Found Using Geological-Geophysical and Geochemical Methods Uchbash-Saphane, Kutahya Western Anatolia, Turkey

Authors:

Musa BurÁak, Fatma Sevim, ÷mer Hacisalihoglu

Key Words:

Geothermal, Gediz, Menderes Massif Shaphane, water-chemistry, magnetotelluric, resistivity, isotope, heat source, well, KSU-1, flow rate

Geo Location:

Shaphane, Turkey

Conference:

Stanford Geothermal Workshop

Year:

2007

Session:

Field Studies

Language:

English

File Size:

1049KB

View File:

Abstract:

The new buried geothemal area is located at near Ucbash (Shaphane) town, 5 km far from Gediz geothermal area at K¸tahya province in Western Anatolia. The basement rocks of studied area comprise Paleozoic aged gneiss, schist and marble which belong to North- North-eastern margin of the Menderes Massif. These basement rocks are tectonically overlain by Cretaceous aged Dagard? ophiolitic melange. All these units covered by Neogene Quaternary aged sedimentary and volcanic rocks.
Geological (Detail geology, remote sensing, aerial photo studies, hydrothermal alteration) geochemical (hydrochemistry and hydrological isotope), geophysical (magnetotelluric and resistivitiy); well logging studies have been carried out in the study area.
There is no manifestatition in around the Shaphane buried geothermal area at the surface except Gediz Abide hot springs at 5 km south. Gediz geothermal area is one of the medium enthalpy geothermal areas in the western Anatolia. The hot spring temperature is 70-76 oC in the area. There are three production wells (301-542-752m) which have 78-93 oC geothermal fluid. Total thermal energy potential of the Gediz area is 27.57 MWt. Geothermal fluids have been used for thermal bath facilities. It can be suitable for district heating (equivalent 2700 dwellings).
The main aims of this study to define chemical characteristics of hot and cold waters to estimate relation between hot and cold water, calculate reservoir temperature using geothermometre and mixing models, clarify extending of recharging area estimate reservoir temperature with respect to water-chemistry, isotope, hydrothermal alteration studies; to define underground structure using geophysical soundings in Gediz geothermal field and in finally detect wheter or not presence of promising area around there by the the means of correlation each data compare with Gediz and probably promising area.
The fractured zones of gneiss form the main reservoir in the Gediz-Abide area. The cap rock of the geothermal reservoir is clay and marl stratas belonging Neogene aged lacustrine sediments and tuff deposited in NW-SE directional graben structure.
On the basis of water chemistry studies hot waters have been classified as Na-SO4-HCO3 type and cold waters Ca HCO3 type. Silica-Entalphy and Chloride-Entalphy mixing models and silica geothermometer have showed that, original water temperature without mixing cold water in the range between 128-157 oC in the reservoir.
In addition to Chloride and SiO2 iso-concentration maps, young tectonic activitiy and thick cap rock which formed Miocene aged lacustrin sediments indicate that promising area is the north. Magnetotelluric and resistivity studies were carried out at three profiles at the promising area. Two anomalies have detected in respect of magnetotell¸ric soundings. Anomalies were observed in each profiles. First one was near Gediz geothermal field and the second indicate promising area was 5km from the first, at the north. Reservoir possibilities are investigated using resistivity soundings at each profile. Two anomaly have been found on each profile which can be interpreta indicating reservoir according to resistivity soundings.
Evaluation of all studies which in carried out indicated that the promising area was suitable for one exploration well. So, Geothermal explaration well (KSU-1), have been drilled at 1330m depth in 2006. Reservoir rocks is marble and chalk-shist between 1100m-1330mand according to core samples and well logging. Geothermal fluid which have 216 T/h, flow rate and 90 oC (at the bottom 109 oC) temperature were producted from the well. KSU-1 well have 13.81 MWt thermal potential. It can be suitable for district heating (equivalent 1400 dwellings), heating green houses, thermal bath facilities.


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