The impact of angular unconformity at the caprock interface on CO2 storage

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The work presented here follows on from Shariatipour et al (2012), and investigates the effect of unconformities, one type of interface, on the storage capacity and security.Besly et al. (1993) studied the base Permian Unconformity in the Southern North Sea and they analysed the petrophysical properties of some wells logs (Cygnus field, UKCS Block 44/12). They presented a theory that a zone just beneath the Permian unconformity had been weathered, and consequently the permeability and the porosity of this zone were increased dramatically (average porosity changed from 0.1 to 0.2 and average permeability changed from 0.1-10 mD to 500 mD). In this work, we have studied the effect a high permeability layer associated with an angular unconformity would have on CO2 storage.We have conducted a range of 2D and 3D numerical simulations to study the impact of unconformities on CO2 storage.The results indicate that unconformities could improve CO2 equestration by providing pathways for CO2 migration to access other storage formations.With appropriate placement of the injectors in a case where there are parallel aquifers, it is possible to maximize CO2 storage.A very thin weathered zone (10 cm – 1m) can contribute significantly to pressure diffusion across the model.
    Original languageEnglish
    Title of host publication75th European Association of Geoscientists and Engineers Conference and Exhibition 2013
    Subtitle of host publicationChanging Frontiers: Incorporating SPE EUROPEC 2013
    Place of PublicationHouten
    PublisherEAGE Publishing BV
    Pages5138-5142
    Number of pages5
    ISBN (Print)9781629937915
    DOIs
    Publication statusPublished - 2013

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  • Cite this

    Shariati pour, S., Pickup, G. E., Mackay, E. J., & Lever, H. (2013). The impact of angular unconformity at the caprock interface on CO2 storage. In 75th European Association of Geoscientists and Engineers Conference and Exhibition 2013: Changing Frontiers: Incorporating SPE EUROPEC 2013 (pp. 5138-5142). EAGE Publishing BV. https://doi.org/10.3997/2214-4609.20130208