Resumo

PANARELLO, H. O.. Isotopic and thermodynamic reservoir characteristics of the Copahue-Caviahue geothermal field, Neuquén province. Argentina. Rev. Asoc. Geol. Argent. [online]. 2002, vol.57, n.2, pp.182-194. ISSN 0004-4822.

The geothermal field of Copahue-Caviahue, situated in the neighboring of an active volcano, has been defined as a vapor dominated field, with stratified layers, connected by fractures, with good vertical permeability within the reservoir. ²H and ¹⁸O analyses done on vapor, water, associated gas analysis and the study of the gas vapor ratio, allowed to prove the existence of at least two productive layers, the shallower at ca. 800-1000m and the deeper at more than1400m (both bellow the well top level). Isotopic and geothermometric temperatures round 200ºC and 250ºC respectively, ¹³C, N₂, Ar and He analyses have let us to characterize the origin of geothermal gases as mainly magma derived.

Palavras-chave : Stable isotopes; Vapor dominated; Copahue; Geotermal field.

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