Microseismic Monitoring of a Duvernay Hydraulic-Fracturing Stimulation, Alberta Canada: Processing and Interpretation assisted by Finite-Difference Synthetic Seismograms
AdvisorEaton, David W.
Committee MemberLawton, Don C.
Gilbert, Hersh J.
MetadataShow full item record
AbstractThe increase in the development of unconventional oil and gas reservoirs in the past years has triggered anomalously high seismic activity in several sedimentary basins around the world, particularly in North American basins located in central and eastern United States and in western Canada. The Duvernay shale play, located in central Alberta, Canada, is an example of the seismicity-triggering effect by hydraulic fracturing stimulations required to produce hydrocarbons from low-permeability formations. To better understand the seismic mechanisms associated with hydraulic fracturing in this area, a local seismic monitoring array comprised by short-period and broadband sensors, was temporally installed to monitor a multi-stage hydraulic-fracturing (MSHF) stimulation on four horizontal wells drilled in the Duvernay Formation near the town of Fox Creek, Alberta, where multiple earthquakes associated with HF have been reported in recent years. This thesis presents a robust workflow for modelling and processing passive seismic data acquired with this local monitoring array, in order to automatically detect and characterize the microseismicity associated with the monitored MSHF stimulation. This characterization includes the epicentre location, depth, magnitude, fault size, and radiated energy of all the detected microseismic events, and the focal mechanisms of the seismic events with the largest magnitudes (up to ML 3.77 in this study). The obtained microseismicity is then integrated with other datasets from the monitored reservoir (well logs and production from the monitored and nearby wells, and 3D seismic) to identify reactivated faults that triggered the largest-magnitude seismic events detected during this monitoring program, and to characterize the unconventional reservoir to forecast the hydrocarbon production after the stimulation. A magnitude scale based on the duration of coda waves was also calibrated for the study area in central Alberta, which can be implemented similar seismic monitoring programs for magnitude estimation as it does not require the installation of broadband sensors. Finally, the generated ground motions of the seismic events with the largest magnitudes detected in this dataset, were determined using the local and regional seismic monitoring arrays to assess the uncertainty of a set of Ground Motion Prediction Equations (GMPE) recently developed for the Fox Creek Area at close and distant hypocentral distances. These GMPEs are fundamental to quantify the seismic hazard of induced earthquakes to nearby communities and infrastructure.
CitationRodríguez-Pradilla, G. (2019). Microseismic Monitoring of a Duvernay Hydraulic-Fracturing Stimulation, Alberta Canada: Processing and Interpretation assisted by Finite-Difference Synthetic Seismograms (Unpublished doctoral thesis). University of Calgary, Calgary, AB.
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