This paper discusses gas chemical equilibria in geothermal reservoirs involving the species C02, CH4, CO, H2S, H2, and H20. A set of equations is developed correlating ratios of gas to C02 with temperature, steam fraction, and CO2 partial pressure in the reservoir. A method for solving the set of nonlinear equations is proposed. These equations do not involve discharge gas/total H20 ratios and may therefore be used for fumaroles and hot-spring fluids. Applications to fumarole and well-discharge fluid compositions in Italian geothermal fields show good correlations between temperatures calculated with this method and the temperatures measured in the reservoir (between 140" to 33OOC).

Press the Back button in your browser, or search again.

Copyright 1987, Stanford Geothermal Program: Readers who download papers from this site should honor the copyright of the original authors and may not copy or distribute the work further without the permission of the original publisher.