| Abstract |
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). |