Assessing the potential of passive seismic monitoring to detect a CO2 leak from the aquistore storage site

A. L. Stork*, Claire Allmark, A. Curtis, J. M. Kendall, H. E. Huppert, D. J. White, K. Worth

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

This paper investigates the potential for passive seismic monitoring (PSM) to detect a CO2 leak for two possible scenarios, where a leak is seismic or aseismic. The Aquistore research project in Saskatchewan, Canada provides a suitable site to investigate this because the site is comprehensively monitored. To understand whether induced seismicity would occur following a hypothetical leak, we conduct modelling of fluid flow through a vertical fault. In the event of an aseismic leak, we assess the potential for ambient noise interferometry (ANI) and a tomographic inversion for Rayleigh wave group-velocity maps to provide a suitable CO2 leakage detection tool. A time-lapse ambient noise tomography survey of a CO2 storage site is possible for the first time because data is available preceding and following injection start-up. The fluid-flow modelling shows that a CO2 leak through a vertical fault would result in induced seismic events at depths <500 m. Predicted changes in seismic velocities with CO2 saturation at Aquistore are too small to resolve with the current precision of surface-wave velocity models. However, ANI may be useful to provide a cost-effective early warning system for leakage if uncertainties are reduced.

Original languageEnglish
Title of host publication4th Sustainable Earth Sciences Conference and Exhibition 2017, Held at Near Surface Geoscience Conference and Exhibition 2017
PublisherEuropean Association of Geoscientists and Engineers, EAGE
Pages96-100
Number of pages5
ISBN (Electronic)9781510850811
Publication statusPublished - 1 Jan 2017
Event4th Sustainable Earth Sciences Conference and Exhibition 2017 - Malmo, Sweden
Duration: 3 Sep 20177 Sep 2017

Conference

Conference4th Sustainable Earth Sciences Conference and Exhibition 2017
CountrySweden
CityMalmo
Period3/09/177/09/17

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  • Cite this

    Stork, A. L., Allmark, C., Curtis, A., Kendall, J. M., Huppert, H. E., White, D. J., & Worth, K. (2017). Assessing the potential of passive seismic monitoring to detect a CO2 leak from the aquistore storage site. In 4th Sustainable Earth Sciences Conference and Exhibition 2017, Held at Near Surface Geoscience Conference and Exhibition 2017 (pp. 96-100). European Association of Geoscientists and Engineers, EAGE.