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
Full text not available from this repository.Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Water injection, microseismic events, source parameters. |
| Subjects: | Methodology > Method and procesing > Source parameter estimation Region > Canada > Alberta Inducing technology > Unconventional hydrocarbon extraction |
| Project: | IS-EPOS project |