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    Estimation of stress induced azimuthal anisotropy - AVO modeling

    132569_13162_048EAGEBrajanovski.pdf (303.0Kb)
    Access Status
    Open access
    Authors
    Brajanovski, Miroslav
    Gurevich, Boris
    Lokajicek, T.
    Nadri, D.
    Bona, Andrej
    Duncan, G.
    Date
    2009
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Brajanovski, Miroslav and Gurevich, Boris and Lokajicek, T. and Nadri, Dariush and Bona, Andrej and Duncan, G. 2009. Estimation of stress induced azimuthal anisotropy - AVO modeling, in Technical Programme Committee Beeke, S. (ed), 71th EAGE Conference & Exhibition, Jun 8 2009. Amsterdam, The Netherlands: EAGE.
    Source Title
    EAGE Conference & Exhibition
    Source Conference
    71th EAGE Conference & Exhibition
    ISBN
    978-9073781-67-2
    Faculty
    Department of Exploration Geophysics
    Faculty of Science and Engineering
    WA School of Mines
    URI
    http://hdl.handle.net/20.500.11937/3424
    Collection
    • Curtin Research Publications
    Abstract

    The analysis of rock anisotropy in terms of seismic velocities and within the context of rock-physics (Biot-Gassmann theory of poroelasticity) provides important information for the evaluation of the stress state (tensors) of rocks, detection of the directions of formation weaknesses, helps in the estimation of overall permeability and failure prediction. Understanding the influence of stress and pore pressure on seismic velocities is important for 4-D reflection seismic interpretation, AVO analysis and reservoir modeling. Laboratory measurements were carried out on spherical shale samples from the overburden under confining stress up to 400 MPa, by means of ultrasonic soundings in 132 independent directions. Such an approach enables the estimation of 3-D elastic anisotropy. Assuming VTI symmetry approximation, from the measured velocities the stiffness tensor was inverted. Since the sandstones were partly unconsolidated, it was not possible to take ultrasonic measurements . To overcome this, we developed a method for stress induced azimuthal anisotropy estimation using only cross-dipole logging data. These results give the possibility for anisotropic correction in AVO analysis.

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