f Resistivity reduction in the vapour-dominated field of Travale (Italy)

The aim of this multidisciplinary work is to find out what can account the significant reduction<br>in resistivity (from 103 to 100 m) observed at the depth of the geothermal reservoirs in the<br>Travale area (SE of Larderello, Italy). Since the exploited fluid is supersaturated steam and<br>thus resistive, its presence and localisation can not explain the observed resistivity<br>reductions. The observed reduction in resistivity could be related: 1) to the lithology and<br>heterogeneities of reservoir rocks and the alteration affecting them (i.e. presence-abundance<br>of conductive minerals), and/or 2) to the presence of brines within a fracture net sufficiently<br>interconnected to produce electrolytic conduction.