The Effect of Aquifer/Caprock Interface on Geological Storage of CO2

Syed Shariatipour, Gillian Pickup, Eric J. Mackay

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    16 Citations (Scopus)
    15 Downloads (Pure)

    Abstract

    The migration of CO2 stored in deep saline aquifers depends on the morphology of the top of the aquifer. Topographical highs, such as anticlines, may trap CO2 and limit the distance migrated, or elevated ridges may provide pathways enabling CO2 to migrate further from the injector. For example, seismic data of the Utsira formation at the Sleipner storage site indicates that a branch of the CO2 plume is moving to the north [1]. It is therefore important to study the interface between the aquifer and the caprock when assessing risk as CO2 storage sites. Undulations in the top surface of an aquifer may either be caused by sedimentary structures [2], or by folding. In addition, irregularities may be generated by faulting [2]. Large-scale features are detected using seismic data (i.e. structures with amplitudes greater than 10 m), and such structures will generally be included in reservoir or aquifer models. However, smaller- scale features could also have an effect on a CO2 plume migration, and this is the topic of our study. We have conducted simulations in models with a range of top-surface morphology, and have examined the distance migrated and the amount of dissolution. The results from this study suggest that the effects of sub-seismic variations in the topography of the aquifer/caprock interface are unlikely to have a significant impact on the migration and dissolution of CO2 in a saline aquifer, compared with tilt or permeability anisotropy. The results were most sensitive to the kv/kh ratio during the injection period.
    Original languageEnglish
    Pages (from-to)5544–5555
    Number of pages12
    JournalEnergy Procedia
    Volume63
    Early online date31 Dec 2014
    DOIs
    Publication statusPublished - 2014
    Event12th International Conference on Greenhouse Gas Control Technologies - University of Texas at Austin, Austin, United States
    Duration: 5 Oct 20149 Oct 2014

    Bibliographical note

    This paper was given at the 12th International Conference on Greenhouse Gas Control Technologies, GHGT 2014; University of Texas at AustinAustin; United States; 5 October 2014 through 9 October 2014
    © 2014 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license
    (http://creativecommons.org/licenses/by-nc-nd/3.0/).

    Funder

    Scottish Carbon Capture and Storage (SCCS) Consortium Foundation CMG

    Keywords

    • CO2 storage
    • interface between caprock and storage formation

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