A shallow borehole array was employed to record microseismic waveforms during multi-stage hydraulicfracturing operations near Fox Creek, Alberta. A total of 530 events with magnitude larger than 0.2 were used to calculate moment tensors, based on the 3C amplitudes and polarities of the direct P-wave. By classifying the best double-couple solutions of the retrieved moment tensors, three groups of distinct focal mechanisms were identified, of which two have predominantly double-couple source mechanisms. The moment tensors of group three exhibit significant non-double-couple components, which needs further interpretation. Based on the resulting source mechanisms, orientations of three principal stresses were estimated. Observed linear alignments within the spatial distribution of microseismic events aided in identifying the fault plane.
Presentation Date: Thursday, October 18, 2018
Start Time: 8:30:00 AM
Location: 210C (Anaheim Convention Center)
Presentation Type: Oral