Poroelastic stress triggering of the December 2013 Crooked Lake, Alberta, induced seismicity sequence

Geophysical Research Letters - Tập 43 Số 16 - Trang 8482-8491 - 2016
Kai Deng1, Yajing Liu1, R. M. Harrington1
1Department of Earth and Planetary Sciences, McGill University, Montreal, Quebec, Canada

Tóm tắt

AbstractThe Crooked Lake area in Central Alberta, Canada, became seismically active in December 2013 with a sequence of earthquakes Mw 2.0 and higher. The earthquakes are suspected to be induced by hydraulic fracturing in nearby horizontal wells due to their strong spatiotemporal correlation. To investigate the physical mechanism of the induced seismicity near Crooked Lake, we calculate stress and pore pressure perturbations resulting from high‐rate multistage fluid injection in the framework of linear poroelasticity. The calculated perturbations are used for seismic risk analysis based on the Coulomb failure criterion. Results show that most seismicity is within a positive Coulomb stress change regime, indicating that failure is promoted by injection of fluid. By comparing Coulomb stress results for different parameter settings, we show that elastic response of the solid matrix, instead of fluid diffusion, is more likely the dominant factor for the induced earthquakes shortly after fluid injection.

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Geophysical Research Letters

Tập 43 Số 16

8482-8491

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