relation: https://episodesplatform.eu/eprints/1510/
title: Source Parameters of Injection-induced Microseismicity
creator: Talebi, Shahrair
creator: Boone, Tom J.
subject: Source parameter estimation
subject: Alberta
subject: Unconventional hydrocarbon extraction
description: We analyze source parameters of microseismic events (M < − 1) associated with high flow-rate water injections in a shale formation at a depth of 220 m. Two types of events were observed several hundred impulsive events with clear P- and S-wave arrivals, and continuous emissions with peaked spectra detected well into the experiment. For a representative collection of impulsive events, an −2 model provided satisfactory fits to displacement spectra corrected for attenuation, and average quality factors of 34 and 15 were obtained for P and S waves. P-wave first motion analysis and E S  /E P ratios indicated the existence of a non-double-couple component in some events, particularly early in the experiment. A clear difference was observed for estimates of stress release parameters as non-double-couple events had smaller stress drops and apparent stresses. The seismic efficiency of double-couple and non-double-couple events was limited to 0.9% and 0.05% respectively, with average values being 0.25% and 0.02%. A comparison of our results with those reported for a similar magnitude range in a hard-rock formation indicates considerably smaller estimates of stress drop and apparent stress in our case while seismic efficiencies are comparable.
publisher: Springer Verlag
date: 1998-11
type: Article
type: PeerReviewed
identifier:   Talebi, Shahrair and Boone, Tom J.  (1998) Source Parameters of Injection-induced Microseismicity.  Pure and Applied Geophysics, 153 (1).  pp. 113-130. DOI: https://doi.org/10.1007/s000240050187 <https://doi.org/10.1007/s000240050187>     
relation: http://dx.doi.org/10.1007/s000240050187
relation: doi:10.1007/s000240050187