Abstract
A water-dominated geothermal reservoir, with a gas cap (mainly CO 2) on the reservoir roof, was individualed in Torre Alfina zone, northern Latium, about 30 km south-east of Monte Amiata. The first exploratory well (Alfina 1), drilled in 1973, blew-out spontaneously so that no production casing could be inserted. After well shut-in several surface gas manifestations appeared which were considered of some risk to the environment. This paper describes the methods used to determine the degree of pollution and the total area involved. The study of the gas dispersion in the atmosphere, the noise resulting from production, and the meteorological conditions in the area, was used in drawing up a disposal plant project; this plant will be assembled on future wells as a safety measure where large quantities of fluids are involved.
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