In response to cases of injection-induced seismicity, regulators have responded by applying traffic-light scheme type monitoring requirements. Such schemes may require operators to detect small-magnitude events. While this can be done with dense arrays of surface geophones, or by deploying instruments downhole, the cost of doing so may be prohibitive for every stage of every well. Instead, we seek to maximise what can be detected using small (10-20) arrays of surface stations. We do so by developing a beamforming/stacking algorithm where STA/LTA functions derived from the P, SV and SH components are combined to reveal events with low signal-to-noise ratio. We apply our method to a case study from North America where induced events were recorded on a network of 17 broadband seismometers placed around a hydraulic fracturing site. Where conventional event detection algorithms reveals 4 induced events during the monitoring period, our method reveals 20 such events, an improvement in event detection of 500%.
|Title of host publication||78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential|
|Publisher||European Association of Geoscientists and Engineers, EAGE|
|Publication status||Published - 2016|
|Event||78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential - Vienna, Austria|
Duration: 30 May 2016 → 2 Jun 2016
|Conference||78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential|
|Period||30/05/16 → 2/06/16|