期刊
GEOPHYSICAL RESEARCH LETTERS
卷 41, 期 23, 页码 8308-8314出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL062047
关键词
induced seismicity; hydraulic fracturing; hazard; location; source mechanism; geomechanics
资金
- Grant Agency of the Czech Republic [P210/12/2451]
We describe the origin of felt seismicity during the hydraulic fracturing of the Carboniferous Bowland Shale at the Preese Hall 1 exploration well near Blackpool in the UK during 2011. The seismicity resulted from the interaction of hydraulic fracturing and a fault, the location of which was unknown at the time but has subsequently been located and does not intersect the well borehole. Waveform cross correlation is used to detect 50 events in the sequence. A representative hypocenter and strike-slip focal mechanism is calculated using the best recorded seismic event. The hypocenter is calculated to lie 300-400m east, and 330-360m below the injection point and shown to lie on a fault imaged using 3-D seismic at a depth of about 2930m. The 3-D survey shows that not only the event hypocenter but also the focal mechanism correlates strongly with a subsequently identifiable transpressional fault formed during the Late Carboniferous (Variscan) basin inversion.
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