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Publication - Dr James Verdon

    Simulation of seismic events induced by CO2 injection at In Salah, Algeria


    Verdon, JP, Stork, AL, Bissell, RC, Bond, CE & Werner, MJ, 2015, ‘Simulation of seismic events induced by CO2 injection at In Salah, Algeria’. Earth and Planetary Science Letters, vol 426., pp. 118-129


    Carbon capture and storage technology has the potential to reduce anthropogenic CO2
    emissions. However, the geomechanical response of the reservoir and
    sealing caprocks must be modelled and monitored to ensure that injected
    CO2 is safely stored. To ensure confidence in model results,
    there is a clear need to develop ways of comparing model predictions
    with observations from the field. In this paper we develop an approach
    to simulate microseismic activity induced by injection, which allows us
    to compare geomechanical model predictions with observed microseismic
    activity. We apply this method to the In Salah CCS project, Algeria. A
    geomechanical reconstruction is used to simulate the locations,
    orientations and sizes of pre-existing fractures in the In Salah
    reservoir. The initial stress conditions, in combination with a history
    matched reservoir flow model, are used to determine when and where these
    fractures exceed Mohr–Coulomb limits, triggering failure. The sizes and
    orientations of fractures, and the stress conditions thereon, are used
    to determine the resulting micro-earthquake focal mechanisms and
    magnitudes. We compare our simulated event population with observations
    made at In Salah, finding good agreement between model and observations
    in terms of event locations, rates of seismicity, and event magnitudes.

    Full details in the University publications repository