Geochemical and isotopical analysis of geothermal and spring waters in order to define the state of water-rock interaction in the reservoir of Los Azufres, Michoacan, Mexico

The chemical and isotopic analysis of fluids produced by the well of Los Azufres, Michoacan, were studied in order to define the state of water-rock interaction in this field's reservoir According to their chemical composition it was found that the waters produced by the wells have a chloride sodium geochemical character; typical of a geothermal brine. This brine is completely in equilibrium with the rock which stores A at temperatures that fluctuate between 280 and 340 degreesC. Considering excess steam data, the mixed water type wells are producing from a liquid dominant rone. The isotopic compositions of the wells present a shift of 0-18 (typical of fluids of geothermal origin which have equilibrated with rocks at high temperatures). The springs found within the field present a geothermal characteristic of acid sulphate. This means that the waters are of meteoric origin heated with geothermal steam.