Abstract
In this paper we present a feasibility study for the surface seismic monitoring of the “Sant’Alberto” gas reservoir (Po Plain, Northern Italy). The project was commissioned to INGV in the framework of the activities planned by the oil & gas EP 2) the installation of the borehole station allows to improve the detection threshold everywhere within DI, and up to ML =-0.4 nearby the reservoir; and 3) localization thresholds obtained in the crustal volume included in DE, but not in DI, show values around ML = 1.0.
Highlights
The “Sant’Alberto” gas field is situated in the eastern part of the Po Plain (Italy), 35 km northeast of Bologna and 15 km southwest of Ferrara (Figure 1), within an area which has been already exploited for hydrocarbon production
The above mentioned gas field lies within the area of the “San Vincenzo” exploration permit, owned by PoValley Energy (PVE), an oil & gas E&P company operating in the production and development of hydrocarbon assets in North of Italy [MiSE-DGS-UNMIG 2001]
Monitoring area In order to increase the effectiveness in discriminating between possible man made earthquakes occurring near the gas reservoir and background natural seismicity of the area, we defined two different crustal volumes of earthquake detection: the inner domain of detection and the extended domain of detection
Summary
The “Sant’Alberto” gas field is situated in the eastern part of the Po Plain (Italy), 35 km northeast of Bologna and 15 km southwest of Ferrara (Figure 1), within an area which has been already exploited for hydrocarbon production. Due to the features of the area, which essentially presents a farming vocation, we expect to observe in this period, higher levels of ambient seismic noise with respect to the winter time [Franceschina et al 2015] This should involve conservative estimates of the detection thresholds of the network. Power spectra distributions are generally comparable with the NHNM curve of Peterson [1993] in the range of frequencies 1-20 Hz. Differences up to 10-20 dB are observed in the mean ambient noise levels within the investigated area, depending on the position of the considered site with respect to the anthropic sources of disturbance
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