Naslov
Spatial and temporal reconstruction of the temperature distribution to assess the water circulation in the Euganean Geothermal Field (NE Italy)

Autori
Pola, Marco ; Fabbri, Paolo ; Piccinini, Leonardo ; Dalla Libera, Nico ; Zampieri, Dario

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
43rd IAH Congress "Groundwater and society: 60 years of IAH" - Book of Abstracts / - , 2016

ISBN
978-2-9554864-0-5

Skup
43rd International Association of Hydrogeologist Congress "Groundwater and society: 60 years of IAH"

Mjesto i datum
Montpellier, Francuska, 25.09.2016. - 29.09.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
thermal logs ; temperature mapping ; thermal water circulation

Sažetak
The Euganean Geothermal Field (EGF) represents one of the biggest thermal areas of Europe extending on a plain band of 25 km² in Veneto region (NE Italy). Approximately 14x10⁶ m³ of water with temperature from 65 to 86°C were exploited in 2014 from fractured layers located in Mesozoic to Oligocene formations. The hydrogeological setting of the 300-600 m deep aquifer is elucidated through transmissivity and temperature maps, while the 800-1000 m deep aquifer is less exploited and investigated. The exploitation influences the natural regime of the aquifers causing seasonal fluctuations of the level related to the variation of the extraction. In 2014-15, five surveys were conducted to measure the potentiometric level and the water temperature in approximately 130 wells (depth up to 1064 m) during periods of high and low exploitation. The data are used to perform temperature maps of both aquifers outlining the spatial and temporal variations of the temperature. The maps of the shallow aquifer evidence two areas with temperature higher than 84°C and an outward decrease. The higher temperature is comparable with the 100°C reservoir temperature calculated with geothermometers suggesting a quick ascent of deep fluids through open fractures with a small loss of heat, while a longer path causes the decrease. The maps of the deep aquifer show higher temperature than the shallow one, but the few available data do not allow a detail ed analysis. Small variations of temperature among the surveys are depicted, but the distributions are slightly comparable. In addition, the temperature collected during 30 vertical thermal logs are examined evidencing a correspondence with the maps, although the logs are performed in inactive wells. Therefore, the correlation of the areal variations depicted with different methods suggests that the geological setting controls the temperature distribution in the EGF. In conclusion, the performed spatial and temporal reconstruction improves the knowledge of the hydrogeological setting of the thermal area providing useful data for the management of such resource.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA