Isotopic and chemical analyses of steam and gas froin the producing wells, from their initial production to 1992, have been used to describe the effects of exploitation and of waste fluid reinjection. Maps of the steam isotopic distribution and of the gas content distribution respectively have been derived for the whole Larderello geothermal field. of pre-reinjection and later data, reveals a good distinction natural inflow, induced by exploitation. and artificial waste fluid recharge. In the wells affected by reinjection, gases, apart from are substantially diluted, since condensates are attained through an evaporation process. variations of and have been used to describe the disequilibrium conditions among gas components. This disequilibrium is induced by the settling of a liquid plume at the producing level in the reservoir.

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