In summer 2013 a toxic and polluting gas blowout (19tonnesday-1 CO2, 95kgday-1 CH4) occurred from two shallow boreholes drilled at only 50m from the International Airport of Rome (Italy), in the town of Fiumicino. Another gas blowout occurred in the same period from a borehole located offshore, 2km away, also generating sea-water acidification; it lasted only a couple of days. Onshore, CO2 was also diffusing from holes within the soil, particularly toward the airport, generating a soil flux up to 1.8tonnesday-1. In 3.5months ~1500tonnes of CO2 and 5.4tonnes of CH4 were emitted in the atmosphere. Temporal monitoring of gas geochemistry indicates that in this area a mixing occurs between shallow and pressurized gas pockets, CO2-dominated, but with different chemical (i.e., He/CH4 ratio) and isotopic (3He/4He, δ13C-δDCH4) characteristics. Numerical simulation of CO2 dispersion in the atmosphere showed that dangerous air CO2 concentrations, up to lethal values, were only found near the vents at a height of 0.2m. Fiumicino is a high blowout risk area, as CO2 rising through deep reaching faults pressurizes the shallow aquifer contained in gravels confined underneath shales of the Tiber delta deposits. The Fiumicino blowout is a typical example of dangerous phenomenon that may occur in urban context lying nearby active or recent volcanoes and requires quick response on hazard assessment by scientists to be addressed to civil protection and administrators.

Carapezza, M., Tarchini, L., Granieri, D., Martelli, M., Gattuso, A., Pagliuca, N., et al. (2015). Gas blowout from shallow boreholes near Fiumicino International Airport (Rome): Gas origin and hazard assessment. CHEMICAL GEOLOGY, 407-408, 54-65 [10.1016/j.chemgeo.2015.04.022].

Gas blowout from shallow boreholes near Fiumicino International Airport (Rome): Gas origin and hazard assessment

Rizzo A;
2015

Abstract

In summer 2013 a toxic and polluting gas blowout (19tonnesday-1 CO2, 95kgday-1 CH4) occurred from two shallow boreholes drilled at only 50m from the International Airport of Rome (Italy), in the town of Fiumicino. Another gas blowout occurred in the same period from a borehole located offshore, 2km away, also generating sea-water acidification; it lasted only a couple of days. Onshore, CO2 was also diffusing from holes within the soil, particularly toward the airport, generating a soil flux up to 1.8tonnesday-1. In 3.5months ~1500tonnes of CO2 and 5.4tonnes of CH4 were emitted in the atmosphere. Temporal monitoring of gas geochemistry indicates that in this area a mixing occurs between shallow and pressurized gas pockets, CO2-dominated, but with different chemical (i.e., He/CH4 ratio) and isotopic (3He/4He, δ13C-δDCH4) characteristics. Numerical simulation of CO2 dispersion in the atmosphere showed that dangerous air CO2 concentrations, up to lethal values, were only found near the vents at a height of 0.2m. Fiumicino is a high blowout risk area, as CO2 rising through deep reaching faults pressurizes the shallow aquifer contained in gravels confined underneath shales of the Tiber delta deposits. The Fiumicino blowout is a typical example of dangerous phenomenon that may occur in urban context lying nearby active or recent volcanoes and requires quick response on hazard assessment by scientists to be addressed to civil protection and administrators.
Articolo in rivista - Articolo scientifico
Chemical and isotopic composition of gas and water; Endogenous gas blowout from shallow wells; Hazard assessment; Simulation and monitoring of air CO2 dispersion; Viscous flux and diffuse soil gas flux measurements
English
2015
407-408
54
65
reserved
Carapezza, M., Tarchini, L., Granieri, D., Martelli, M., Gattuso, A., Pagliuca, N., et al. (2015). Gas blowout from shallow boreholes near Fiumicino International Airport (Rome): Gas origin and hazard assessment. CHEMICAL GEOLOGY, 407-408, 54-65 [10.1016/j.chemgeo.2015.04.022].
File in questo prodotto:
File Dimensione Formato  
Carapezza-2015-Chem Geol-VoR.pdf

Solo gestori archivio

Descrizione: Research Article
Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Licenza: Tutti i diritti riservati
Dimensione 4.43 MB
Formato Adobe PDF
4.43 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/428639
Citazioni
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 17
Social impact