GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 - POSTER GNGTS 2023 Which faults are active in Val d’Agri (Basilicata, southern Apennines, Italy)? A multidisciplinary approach gives new insights into the shallow structural setting M. Caciagli 1 , T. Braun 2 , M. Buttinelli 2 , F. Cinti 2 , S. Danesi 1 , P.M. De Martini 2 , M. Errico 1 , D. Famiani 2 , R. Maffucci 2 , V. Materni 3 , D. Pantosti 2 , S. Pucci 2 , S. Salimbeni 1 , V. Sapia 3 1 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Bologna, Italy 2 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma 1, Roma, Italy 3 Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma 2, Roma, Italy The Val d’Agri (VA) is a Quaternary tectonic basin of the Lucanian Apennines (southern Italy), located in one of the areas with the highest seismic hazard in Italy. The VA hosts the largest on-shore oilfield in Europe and the Pertusillo artificial lake, which serves as a water resource for a large portion of Southern Italy. The structural setting of the Lucanian Apennines chain is very complex and mainly characterized by a general overthrusting of Mesozoic-to-Paleogene pelagic basin deposits (Lagonegro units) and Miocene flysch deposits upon a deformed carbonate succession of the Apulia platform. Both thin- and thick-skinned structural styles have been invoked to justify such a complex shallow crust arrangement (Menardi Noguera and Rea, 2000; Scrocca et al., 2005).  The VA is filled by Quaternary continental deposits and is bounded by two parallel and oppositely dipping normal fault systems: the Monti della Maddalena Fault System (MMFS) on its western side and the Eastern Agri Fault System (EAFS) on the eastern one (Cello et al., 2003; Maschio et al., 2005). Defining the ongoing tectonic activity of the MMFS and EAFS and their hierarchical relationship is challenging. It is still generating considerable debate among the geological scientific community.  In 1993, a joint multinational operator started the production of Oil & Gas through 28 production wells with an average of 7*10 4 barrels/day of oil and 3*10 6 Smc/day of gas. Since 2006, part of the wastewater associated with hydrocarbon extraction has been recycled into the reservoir constituted by the Apulian carbonates (at ~3 km depth) through the Costa Molina 2 (CM2) reinjection well, located to the southeast of VA.