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    Effect of supercritical CO2 on carbonates: Savonnières sample case study

    Access Status
    Open access via publisher
    Authors
    Shulakova, Valeriya
    Sarout, J.
    Pimienta, L.
    Lebedev, M.
    Mayo, S.
    Clennell, M.
    Pervukhina, M.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Shulakova, V. and Sarout, J. and Pimienta, L. and Lebedev, M. and Mayo, S. and Clennell, M. and Pervukhina, M. 2017. Effect of supercritical CO2 on carbonates: Savonnières sample case study. Geophysical Prospecting. 65 (1): pp. 251-265.
    Source Title
    Geophysical Prospecting
    DOI
    10.1111/1365-2478.12369
    ISSN
    0016-8025
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/25703
    Collection
    • Curtin Research Publications
    Abstract

    CO2 geosequestration is an efficient way to reduce greenhouse gas emissions into the atmosphere. Carbonate rock formations are one of the possible targets for CO2 sequestration due to their relative abundance and ability to serve as a natural trapping reservoir. The injected supercritical CO2 can change properties of the reservoir rocks such as porosity, permeability, tortuosity, and specific surface area due to dissolution and precipitation processes. This, in turn, affects the reservoir characteristics, i.e., their elastic properties, storage capacity, stability, etc. The tremendous progresses made recently in both microcomputed X-ray tomography and high-performance computing make numerical simulation of physical processes on actual rock microstructures feasible. However, carbonate rocks with their extremely complex microstructure and the presence of microporosity that is below the resolution of microcomputed X-ray tomography scanners require novel, quite specific image processing and numerical simulation approaches.In the current work, we studied the effects of supercritical CO2 injection on microstructure and elastic properties of a Savonnières limestone. We used microtomographic images of two Savonnières samples, i.e., one in its natural state and one after injection and residence of supercritical CO2. A statistical analysis of the microtomographic images showed that the injection of supercritical CO2 led to an increase in porosity and changes of the microstructure, i.e., increase of the average volume of individual pores and decrease in the total number of pores. The CO2 injection/residence also led to an increase in the mean radii of pore throats, an increase in the length of pore network segments, and made the orientation distribution of mesopores more isotropic. Numerical simulations showed that elastic moduli for the sample subjected to supercritical CO2 injection/residence are lower than those for the intact sample.

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