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    Integrated monitoring of the CO2 Storage Ketzin using a structure-based combination of seismics and geoelectrics

    Access Status
    Fulltext not available
    Authors
    Bergmann, P.
    Ivandic, M.
    Kiessling, D.
    Rücker, C.
    Schmidt-Hattenberger, C.
    Lüth, S.
    Juhlin, Christopher
    Norden, B.
    Date
    2012
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Bergmann, P. and Ivandic, M. and Kiessling, D. and Rücker, C. and Schmidt-Hattenberger, C. and Lüth, S. and Juhlin, C. et al. 2012. Integrated monitoring of the CO2 Storage Ketzin using a structure-based combination of seismics and geoelectrics, in Proceedings of the 74th EAGE Conference and Exhibition incorporating SPE EUROPEC 2012, May 23-26 2011, pp. 3640-3644. Copenhahen: European Association of Geoscientists & Engineers.
    Source Title
    74th European Association of Geoscientists and Engineers Conference and Exhibition 2012 Incorporating SPE EUROPEC 2012: Responsibly Securing Natural Resources
    ISBN
    9781629937908
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/13936
    Collection
    • Curtin Research Publications
    Abstract

    Geophysical monitoring at the CO2 pilot storage Ketzin comprises time-lapse seismic and geoelectric (ERT) measurements. Both types of measurements are known to image geological structures differently, in particular for a variable saturation of CO2. We present a combination of both methods by means of a structural constrained inversion approach. Structural constraints are implemented in the geoelectric inversion by a local regularization. This allows model parameters to behave discontinuously across prominent geological boundaries. A tetrahedral finite-element parametrization is used to closely follow geometric a priori structures interpreted from seismic reflection data. Thus, seismics and geoelectrics are arranged in a sequential workflow which is based on a structural similarity. Practical application is performed on the Ketzin datasets which comprise repeated 3D seismic surveys, as well as repeated surface-downhole geoelectric surveys, providing different illumination/coverage and time-lapse signals. However, application of a local regularization for the caprock-reservoir boundary yields a more consistent image and reduces some of the ill-posedness in the ERT inversion. We compare the result with that of an unconstrained inversion and discuss its potential for CO2 migration imaging.

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