Pantelleria, a small volcanic island located in the Sicily channel, contains a water dominated geothermal field in its southern part. The reservoir, characterized by temperatureofabout250°C,wastappedbya990mdeepwell,whichhighlightedthe existence of deep fluids of marine origin significantly depleted in Ca and Mg and enrichedinSiandKduetotheinteractionwithtrachyticrockshostingthegeothermal reservoir.Significanttemperatureinversionswithdepthareobservedbetween20and 100 m b.s.l in five shallow exploratory wells drilled throughout the island. These inversionsareduetohotwaterswhich,withtemperatureupto110°Candrepresented byvariablemixturesofmeteoricrechargeandseawater,flowoveradenserandcolder sea water from the inner to the external parts of the island. The hydrogeological conceptualmodelforeseesagroundwatercirculationcharacterizedbyconvectiveflows whosemainengineisrepresentedbythegeothermalsystem.
Convective water circulation in a geothermal island: Pantelleria (Sicily Channel).
Doveri M;Grassi S
2010
Abstract
Pantelleria, a small volcanic island located in the Sicily channel, contains a water dominated geothermal field in its southern part. The reservoir, characterized by temperatureofabout250°C,wastappedbya990mdeepwell,whichhighlightedthe existence of deep fluids of marine origin significantly depleted in Ca and Mg and enrichedinSiandKduetotheinteractionwithtrachyticrockshostingthegeothermal reservoir.Significanttemperatureinversionswithdepthareobservedbetween20and 100 m b.s.l in five shallow exploratory wells drilled throughout the island. These inversionsareduetohotwaterswhich,withtemperatureupto110°Candrepresented byvariablemixturesofmeteoricrechargeandseawater,flowoveradenserandcolder sea water from the inner to the external parts of the island. The hydrogeological conceptualmodelforeseesagroundwatercirculationcharacterizedbyconvectiveflows whosemainengineisrepresentedbythegeothermalsystem.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
