GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 3.1 - POSTER GNGTS 2023 identification of one or more case studies in the southern Latium, mainly in the Valle Latina. In the southernmost part of Latium, in correspondence of the Mesozoic carbonate reservoir, hot waters were found within 1-1.4 km depth in the areas of (i) Latina (60 °C at 1.4 km); (ii) Fogliano (80 °C at 1 km); (iii) in the Valle Latina (50-70 °C at 1-2 km); and (iv) near the Terme di Suio (50-100 °C at 0.5-1 km). Data and methods. To reconstruct the distributions of temperatures at depth we performed various operational data processing and elaboration projects in GIS environment. We used as input data the temperature values extracted from the isolines at 1000, 2000 and 3000 m depth reported in the UNMIG, CNR and AGIP 1988 database to extrapolate the isothermal surfaces from 50° to 350° C, every 50° C. Surface to depth correction at an absolute depth with the Bottom Hole Temperatures (BHT) from the CNR opensource Wells database ( www.geothopica.it ) , was performed in order to redraw temperature isolines in coherence with well data (Fig. 1). An analysis and comparison of the first outputs, with the previous non-calibrated surfaces (firstly for 1000, 2000 and 3000 m temperature maps and secondly for the depth maps of each temperature), has been done for the identification of areal and depth discrepancies aimed at correcting the input and output data in order to smooth out any inhomogeneity or thermic inversion. Fig.1 - 3D view of the real recostruction of isotemperature surfaces. Red arrow shows the AOI for the case study. We then compared the temperatures values obtained from our analyses with the subsurface geology and the topography, by overlapping areas characterized by high values with DEM structural highs, top carbonate structural highs, top of the basement structural highs and positive gravimetric Bouguer anomalies that are strongly linked to high heat subsurficial magmatic bodies.