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Rock elasticity as a function of the uniaxial stress: laboratory measurements and theoretical modelling of vertical transversely isotropic and orthorhombic shales

V. Sviridov, S. I. Mayr and S. A. Shapiro – 2019

Titel
Rock elasticity as a function of the uniaxial stress: laboratory measurements and theoretical modelling of vertical transversely isotropic and orthorhombic shales
Verfasser
V. Sviridov, S. I. Mayr and S. A. Shapiro
Datum
2019
Zitierweise
Sviridov et al., 2019, Rock elasticity as a function of the uniaxial stress: laboratory measurements and theoretical modelling of vertical transversely isotropic and orthorhombic shales, Geophysical Prospecting, 67 (7): 1867-1881
Sprache
eng
Art
Text
BibTeX Code
@article{doi:10.1111/1365-2478.12805,
author = {Sviridov, V.A. and Mayr, S.I. and Shapiro, S.A.},
title = {Rock elasticity as a function of the uniaxial stress: laboratory measurements and theoretical modelling of vertical transversely isotropic and orthorhombic shales},
journal = {Geophysical Prospecting},

volume = {67},
number = {7},
pages = {1867-1881},
keywords = {Anisotropy, Elastics, Modelling, Rock physics},
doi = {10.1111/1365-2478.12805},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/1365-2478.12805},
eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2478.12805},
abstract = {ABSTRACT We apply a rock-physics model that describes the relationship between the effective stress and rock elasticity. We experimentally obtain and analyse a data set containing one vertical transversely isotropic and one orthorhombic shale sample. The vertical transversely isotropic symmetry of the first sample is caused by the layered structure of the rock. The seismic orthorhombicity of the second sample could be explained after microscopic analysis of thin section, which demonstrates an imperfect disorder of inhomogeneities. Both samples were loaded uniaxially in a quasi-static regime. During the loading, we measured stress-dependent seismic velocities and sample deformations. For the analysis of the stress-dependent velocities and stiffnesses, we modelled the measured data set using a recent generalization of the porosity deformation approach. Comparison of the experimentally determined and numerically modelled data supports the applicability of the theory and helps in the interpretation of experimentally obtained data. In agreement with the theory, uniaxial stress increases the elliptic component of the seismic anisotropy and does not impact the anellipticity parameter. We demonstrate the distinct influence of the stiff and compliant porosities on the stress sensitivity of the elastic properties.},
year = {2019}
}