Istituto di Geoscienze e Georisorse     
Gherardi F., Magro G., Bayon F. E. B. Geothermal water-rock equilibria at Palinpinon, Philippines: Insights from major reactive gas constituents. In: Procedia earth and planetary science, vol. 7 pp. 296 - 299. Proceedings of the Fourteenth International Symposium on Water-Rock Interaction, WRI 14. Elsevier, 2013.
Eleven producing wells of the Palinpinon geothermal field have been monitored for major reactive gas components over the period 1998-2010. Based on H2O, CO2, H2S, H2, and CH4 relative concentrations, we estimated redox conditions (controlled by the Fe(II)-Fe(III) buffer), a possible equilibrium mineralogical assemblage (made up by epidote-prehnite-quartz-calcite-pyrite-pyrrhotite), deep equilibration temperatures (up to 350C), and CO2 partial pressures (up to 12 bar) for the deepest, liquid-dominated portions of the reservoir.
URL: http://www.sciencedirect.com/science/journal/18785220?sdc=1
Subject gas geochemistry
reactive gases
hydrothermal equilibria
Palinpinon geothermal field

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