Geochemical and isotopical analysis of geothermal and spring waters in order to define the state of water-rock interactiopn in the reservoir of Los Azufres, Michoacan, Mexico [Análisis Geoquímico e Isotópico de Aguas Geotérmicas y Manantiales para Definir el Estado de Equilibrio Agua Roca del Reservorio de Los Azufres, Michoacan, México]
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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 it at temperatures that fluctuate between 280 and 340°C. Considering excess steam data, the mixed water type wells are producing from a liquid dominant zone. 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.
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