Geochemical Exploration at Cuitzeo Basin Geothermal Zone (Mexico)

Water samples from springs and wells from the Cuitzeo Basin (Michoacan state, Mexico) were studied to investigate the main geochemical features of deep waters assessing moderate temperature geothermal resources in Mexico for direct uses. Radon measurements were also performed. Waters were classified as bicarbonate, chloride and sulfate according to their origin. Partially equilibrated and immature waters were found with reservoir temperatures between 129 to 216 °C. Silica temperature results indicate reservoir temperatures in the range 100 to 200 °C. Those temperatures are useful not only for direct uses but also to generate electricity. The average ground water radon concentration values were relatively low indicating an efficient fluid circulation pattern.