Geochemistry of the surface and deep fluids of the Miravalles volcano geothermal system (Costa Rica)

摘要

The Miravalles high-temperature geothermal reservoir, located in the northwestern part of Costa Rica, is liquid-dominated. Reservoir temperatures generally range between 230 and 240 deg. C. The highest measured value is 255 deg. C. Bottom-hole measurements and solute geothermometry Indicate that thermal conditions within the reservoir are very stable over time. The waters dis- Charged form the wells have a neutral or slightly alkaline pH and are of the sodium-chloride type.