3D Numerical Simulations of Non-Volcanic CO2 Degassing in Active Fault Zones Based on Geophysical Surveys

Abstract An integrated approach that combines geophysical surveys and numerical simulations is proposed to study the processes govern fluid flow along active fault zones. It based on reconstruction of architecture investigated system, as well identification possible paths for migration, according distribution parameters retrieved by multi-methodological prospecting. The aim establish, thanks constraints deriving from different types data (e.g., geological, geochemical and/or hydrogeological data), an accurate 3D petrophysical model survey area be used simulating, modelling, physical likely taking place in imaged system its temporal evolution. effectiveness tested zone Matese Mts (southern Italy), where recent, measurements have registered very high anomalous values non-volcanic natural emissions CO 2 . In particular, a survey, consisting electrical resistivity tomography, self-potential passive seismic measurements, with geological data, was chosen define identify source geometries. Three scenarios were assumed corresponding three models. one hypothesizes located plane at depth carbonate basement found best candidate represent test site. Indeed, performed provide estimates comparable observed area. These findings are promising gas hazards, they suggest degassing could forecast critical variations amount emitted near fault.