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Sensors (Basel). 2013 Sep 2;13(9):11522-38. doi: 10.3390/s130911522.

Microseismic monitoring of CO2 injection at the Penn West Enhanced Oil Recovery pilot project, Canada: implications for detection of wellbore leakage.

Author information

1
Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Section 3.2 Geomechanics and Rheology, Telegrafenberg, Potsdam 14473, Germany. patricia@gfz-potsdam.de.

Abstract

A passive seismic monitoring campaign was carried out in the frame of a CO2-Enhanced Oil Recovery (EOR) pilot project in Alberta, Canada. Our analysis focuses on a two-week period during which prominent downhole pressure fluctuations in the reservoir were accompanied by a leakage of CO2 and CH4 along the monitoring well equipped with an array of short-period borehole geophones. We applied state of the art seismological processing schemes to the continuous seismic waveform recordings. During the analyzed time period we did not find evidence of induced micro-seismicity associated with CO2 injection. Instead, we identified signals related to the leakage of CO2 and CH4, in that seven out of the eight geophones show a clearly elevated noise level framing the onset time of leakage along the monitoring well. Our results confirm that micro-seismic monitoring of reservoir treatment can contribute towards improved reservoir monitoring and leakage detection.

PMID:
24002229
PMCID:
PMC3821359
DOI:
10.3390/s130911522
[Indexed for MEDLINE]
Free PMC Article

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