Characterization of damage processes in Montney siltstone under triaxial compression using acoustic emission and diagnostic imaging

Jia, Suzie Q.; Wong, Ron C. K.; Eaton, David W.

doi:10.1093/gji/ggab455

Characterization of damage processes in Montney siltstone under triaxial compression using acoustic emission and diagnostic imaging

Journal Article · Wed Nov 03 00:00:00 EDT 2021 · Geophysical Journal International

DOI:https://doi.org/10.1093/gji/ggab455· OSTI ID:1834266

; Wong, Ron C. K.; Eaton, David W.

SUMMARY

Crack nucleation and rock failure processes in a fine-grained siltstone (Montney Formation) under triaxial compression are investigated using combined diagnostic techniques, including ultrasonic-wave measurement, acoustic-emission (AE) monitoring, computed tomography (CT) scanning, and thin-section imaging. The sample displays a weak-to-moderate inherent seismic anisotropy and noticeable stress-induced anisotropy prior to failure. No AE event was detected until the applied axial stress reached 95 per cent of the peak value. The signal-to-noise ratio is relatively low, however, and detectable AE events are more diffuse than those observed in highly brittle rocks. The AE locations correlate with a shear fracture zone imaged by CT scanning. AE moment-tensor analysis reveals that events with larger relative magnitudes are characterized by high volumetric (tensile or compressive) components, and the initiation of the failure zone is dominated by combined shear-tensile (ST) failure. Stress inversion of the AE events with high tensile components is in good agreement with the known applied stress. Microscopic imaging of thin sections from the failed sample shows that the failure zone is an en echelon structure consisting of a major fracture with branching micro and minor cracks. This failure mechanism is consistent with a ST source mechanism and is interpreted to be associated with the fine granular structure and mineral composition of Montney siltstone.

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Sponsoring Organization:: USDOE Office of Electricity (OE), Advanced Grid Research & Development. Power Systems Engineering Research

OSTI ID:: 1834266

Journal Information:: Geophysical Journal International, Journal Name: Geophysical Journal International Journal Issue: 3 Vol. 228; ISSN 0956-540X

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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