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    Analysis of Sedimentary Cyclicity Based on X-ray CT Images and Ultrasonic Measurements of Core Samples

    152391_26310_Analysis of Sedimentary Cyclicity Based.pdf (604.7Kb)
    Access Status
    Open access
    Authors
    Grochau, M.
    Campos, E.
    Mueller, T.
    Nadri, D.
    Clennell, B.
    Gurevich, Boris
    Date
    2010
    Type
    Conference Paper
    
    Metadata
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    Citation
    Grochau, M.H. and Campos, E. and Mueller, T.M. and Nadri, D. and Clennell, B. and Gurevich, B. 2010. Analysis of Sedimentary Cyclicity Based on X-ray CT Images and Ultrasonic Measurements of Core Samples, 72nd EAGE Conference and Exhibition, Jun 14 2010. Barcelona: European Association of Geoscientists and Engineers.
    Source Title
    EAGE Conference Proceedings & Exhibitors' Catalogue
    Source Conference
    72nd EAGE Conference and Exhibition
    ISBN
    978-90-73781-86-3
    School
    Department of Exploration Geophysics
    URI
    http://hdl.handle.net/20.500.11937/4820
    Collection
    • Curtin Research Publications
    Abstract

    We present a methodology to assess rock properties by using X-ray computed tomography (CT) images along with the ultrasonic P-wave velocity measurements in laboratory under different confining pressures, and borehole logs from a stratigraphic interval in Campos Basin, offshore Brazil. The higher resolution of sampling in the core data overcomes the aliasing and smoothing effect of log-based measurements and enables the delineation of stratigraphic cycles. In addition, we observe a good correlation between X-ray CT value and ultrasonic P-wave velocity. Large variation in measured ultrasonic P-wave velocity between different samples is related to variations in calcium content.This improved understanding of the cyclic nature of physical property variations may help to correlate stratigraphy between wells and provide valuable information for paleo-climate studies. This study also helps to understand the facies heterogeneity in fine scale which is needed for choosing the correct rock physics model for further undergoing studies such as time lapse in this field. Given the periodic nature of sedimentary facies, the unique combination of X-ray CT images, ultrasonic P-wave velocities, and high resolution well logs in this field could be used as an example for seismic wave propagation studies in periodic media.

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