Calibration of Chemical Geothermometers Based on Fluid-Mineral Equilibrium Calculations with Application to the Hot Spring Areas in the South of Fujian Province, China

Abstract

Based on the measured down hole temperature and the fluid mineral equilibrium calculations, the conventional geothermometers are calibrated for their suitability in an area with granitic rocks as the dominant reservoir rock. For the geothermal system selected for calibration, conventional geothermometers seem to be in good agreement with the measured temperature, temperature from fluid mineral equilibrium calculations, and with each other. Chalcedony seems to control the dissolved silica in the thermal waters. Different geothermometers agrees with the common trends of the energy potential appraisal of the hot springs though discrepancy exists among them when used for a particular system. Na-K geothermometers should be used with great care for they tend to give temperature exceptionally higher than those by other methods.