eprintid: 1511 rev_number: 18 eprint_status: archive userid: 2 dir: disk0/00/00/15/11 datestamp: 2015-02-11 12:22:12 lastmod: 2017-02-08 12:21:42 status_changed: 2015-04-27 12:11:02 type: article metadata_visibility: show creators_name: Talebi, Shahrair creators_name: Boone, Tom J. creators_name: Eastwood, John E. creators_id: stalebi@nrcan.gc.ca creators_id: creators_id: corp_creators: CANMET, Canada corp_creators: Imperial Oil Resources Ltd., Canada corp_creators: Exxon Production Research Company, USA title: Injection-induced Microseismicity in Colorado Shales ispublished: pub subjects: MP2 subjects: MP4 subjects: RCA1 subjects: SHU divisions: EPOS-P full_text_status: none keywords: Water injection, microseismicity, source location, P- and S-wave velocity, attenuation, polarization. abstract: Imperial Oil Resources Limited uses cyclic steam stimulation to recover oil from their Cold Lake oil field in Alberta. This operation, in particular situations, can be associated with the failure of well casings in the Colorado shales above the oil-bearing formation. A number of fluid injection operations was undertaken at this site and the associated microseismicity was detected using two three-component geophones and fifteen hydrophones. The purpose of this experiment was to simulate the occurrence of a casing failure, determine the feasibility of monitoring in a shallow environment, and characterize the microseismic activity. A calibration survey provided values of 1786 ± 108 m/s for P-wave velocity, 643 ± 56 m/s for S-wave velocity and 0.428 ± 0.017 for Poisson’s ratio in the shale formation. Estimates of the quality factor Q P were 15 for the horizontal direction and 38 for the vertical direction, corroborating the evidence of velocity anisotropy. Calibration shots were located to within 10 m of the actual shot points using triangulation and polarization techniques. Several hundred microseis mic events were recorded and 135 events were located. The results showed that microseismic activity was confined to depths within 10 meters of the injection depth. The experiment clearly established the feasibility of detecting microseismicity induced by fluid injection rates typical of casing failures in shales at distances over 100 m. date: 1998-11 date_type: published publication: Pure and Applied Geophysics volume: 153 number: 1 publisher: Springer Verlag pagerange: 95-111 id_number: doi:10.1007/s000240050186 refereed: TRUE issn: 0033-4553 official_url: http://dx.doi.org/10.1007/s000240050186 access_IS-EPOS: limited owner: Publisher citation: Talebi, Shahrair and Boone, Tom J. and Eastwood, John E. (1998) Injection-induced Microseismicity in Colorado Shales. Pure and Applied Geophysics, 153 (1). pp. 95-111. DOI: https://doi.org/10.1007/s000240050186