Journal article

Modeling elastic anisotropy resulting from the application of triaxial stress

Olivia Collet, Boris Gurevich, Mahyar Madadi, Marina Pervukhina

GEOPHYSICS | SOC EXPLORATION GEOPHYSICISTS | Published : 2014

Abstract

Elastic wave velocities in rocks vary with stress due to the presence of discontinuities and microcracks within the rock. We analytically derived a model to account for stress dependency of seismic velocities when a rock is subjected to triaxial stresses. We first considered a linearly isotropic elastic medium permeated by a distribution of cracks with random orientations. The geometry of cracks is not specified; instead, their behavior is defined by a ratio B of their normal to tangential excess compliances. When this isotropic rock is subjected to triaxial stresses, cracks tend to close depending on their orientation with respect to the applied stresses. For small stresses, the model predi..

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University of Melbourne Researchers

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Funding Acknowledgements

We acknowledge CGG and Curtin University for providing the postgraduate scholarship for O. Collet and the sponsors of the Curtin Reservoir Geophysics Consortium (CRGC) for financial support. We also thank R. Prioul, R. Pevzner, and J. Downton for useful discussions.