Occurrence of Smectites and Smectite-Rich Mixed Layers at High Temperature Within Reservoirs of Active Geothermal Fields
- Key words
- clay, smectite, permeability, boiling, Milos, Chipilapa
- Location
- Milos, Greece; Chipilapa, El Salvador
- Conference
- World Geothermal Congress
- Year
- 1995
- Session
- SECTION 4 ? Exploration and Conceptual Modeling
- Language
- English
- Paper number
- 2-Papapanagiotou
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Abstract
The 0 2 clay fraction of samples coming from drill holes from the geothermal field at Milos (Greece) and from the geothermal field at Chipilapa (El Salvador) have been investigated by X-ray diffraction. The low permeability zones are characterized by the conversion of smectite to illite and to chlorite with increasing depth and temperature. The high permeability zones (present-day reservoirs) are characterized by the occurrence of smectites at high temperatures. These smectites are in isotopic equilibrium with the modern fluids. The precipitation of these incompatible clays at so high temperatures is related to boiling.
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