Lopez-Comino, Jose Angel and Cesca, Simone and Jarosławski, Janusz and Montcoudiol, Nelly and Heimann, Sebastian and Dahm, Torsten and Lasocki, Stanislaw and Gunning, Andrew and Capuano, Paolo and Ellsworth, William L. (2018) Induced seismicity response of hydraulic fracturing: results of a multidisciplinary monitoring at the Wysin site, Poland. Scientific Reports, 8 (1). DOI: https://doi.org/10.1038/s41598-018-26970-9
Full text not available from this repository.Abstract
Shale oil and gas exploitation by hydraulic fracturing experienced a strong development worldwide over the last years, accompanied by a substantial increase of related induced seismicity, either consequence of fracturing or wastewater injection. In Europe, unconventional hydrocarbon resources remain underdeveloped and their exploitation controversial. In UK, fracturing operations were stopped after the Mw 2.3 Blackpool induced earthquake; in Poland, operations were halted in 2017 due to adverse oil market conditions. One of the last operated well at Wysin, Poland, was monitored independently in the framework of the EU project SHEER, through a multidisciplinary system including seismic, water and air quality monitoring. The hybrid seismic network combines surface mini-arrays, broadband and shallow borehole sensors. This paper summarizes the outcomes of the seismological analysis of these data. Shallow artifcial seismic noise sources were detected and located at the wellhead active during the fracturing stages. Local microseismicity was also detected, located and characterised, culminating in two events of Mw 1.0 and 0.5, occurring days after the stimulation in the vicinity of the operational well, but at very shallow depths. A sharp methane peak was detected ~19hours after the Mw 0.5 event. No correlation was observed between injected volumes, seismicity and groundwater parameters.