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Title: Elastic wave velocity evolution of shales deformed under uppermost crustal conditions

Abstract

In this paper, conventional triaxial tests were performed on a series of samples of Tournemire shale along different orientations relative to bedding (0°, 90°). Experiments were carried out up to failure at increasing confining pressures ranging from 2.5 to 80 MPa, and at strain rates ranging between 3 × 10 -7 s -1 and 3 × 10 -5 s -1. During each experiment, P and S wave elastic velocities were continuously measured along many raypaths with different orientations with respect to bedding and maximum compressive stress. This extensive velocity measurement setup allowed us to highlight the presence of plastic mechanisms such as mineral reorientation during deformation. The evolution of elastic anisotropy was quantified using Thomsen's parameters which were directly inverted from measurement of elastic wave velocity. Brittle failure was preceded by a change in P wave anisotropy, due to both crack growth and mineral reorientation. Anisotropy variations were largest for samples deformed perpendicular to bedding, at the onset of rupture. Anisotropy reversal was observed at the highest confining pressures. For samples deformed parallel to bedding, the P wave anisotropy change is weaker.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4];  [5];  [6]; ORCiD logo [7]
  1. Univ. de Cergy-Pontoise, Cergy-Pontoise (France); Ecole Normale Superieure de Paris, Paris (France)
  2. Ecole Normale Superieure de Paris, Paris (France)
  3. Univ. de Cergy-Pontoise, Cergy-Pontoise (France)
  4. Aix-Marseille Univ., Marseille (France)
  5. Total, Pau (France)
  6. Univ. de Poitiers, Poitiers (France)
  7. Institut de Radioprotection et de Surete Nucleaire, Fontenay-aux-Roses (France)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1480772
Grant/Contract Number:  
[AC02-05CH11231]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Solid Earth
Additional Journal Information:
[ Journal Volume: 122; Journal Issue: 1]; Journal ID: ISSN 2169-9313
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; shales; elastic properties; velocities; anisotropy

Citation Formats

Bonnelye, Audrey, Schubnel, Alexandre, David, Christian, Henry, Pierre, Guglielmi, Yves, Gout, Claude, Fauchille, Anne -Laure, and Dick, Pierre. Elastic wave velocity evolution of shales deformed under uppermost crustal conditions. United States: N. p., 2017. Web. doi:10.1002/2016JB013540.
Bonnelye, Audrey, Schubnel, Alexandre, David, Christian, Henry, Pierre, Guglielmi, Yves, Gout, Claude, Fauchille, Anne -Laure, & Dick, Pierre. Elastic wave velocity evolution of shales deformed under uppermost crustal conditions. United States. doi:10.1002/2016JB013540.
Bonnelye, Audrey, Schubnel, Alexandre, David, Christian, Henry, Pierre, Guglielmi, Yves, Gout, Claude, Fauchille, Anne -Laure, and Dick, Pierre. Wed . "Elastic wave velocity evolution of shales deformed under uppermost crustal conditions". United States. doi:10.1002/2016JB013540. https://www.osti.gov/servlets/purl/1480772.
@article{osti_1480772,
title = {Elastic wave velocity evolution of shales deformed under uppermost crustal conditions},
author = {Bonnelye, Audrey and Schubnel, Alexandre and David, Christian and Henry, Pierre and Guglielmi, Yves and Gout, Claude and Fauchille, Anne -Laure and Dick, Pierre},
abstractNote = {In this paper, conventional triaxial tests were performed on a series of samples of Tournemire shale along different orientations relative to bedding (0°, 90°). Experiments were carried out up to failure at increasing confining pressures ranging from 2.5 to 80 MPa, and at strain rates ranging between 3 × 10-7 s-1 and 3 × 10-5 s-1. During each experiment, P and S wave elastic velocities were continuously measured along many raypaths with different orientations with respect to bedding and maximum compressive stress. This extensive velocity measurement setup allowed us to highlight the presence of plastic mechanisms such as mineral reorientation during deformation. The evolution of elastic anisotropy was quantified using Thomsen's parameters which were directly inverted from measurement of elastic wave velocity. Brittle failure was preceded by a change in P wave anisotropy, due to both crack growth and mineral reorientation. Anisotropy variations were largest for samples deformed perpendicular to bedding, at the onset of rupture. Anisotropy reversal was observed at the highest confining pressures. For samples deformed parallel to bedding, the P wave anisotropy change is weaker.},
doi = {10.1002/2016JB013540},
journal = {Journal of Geophysical Research. Solid Earth},
number = [1],
volume = [122],
place = {United States},
year = {2017},
month = {11}
}

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Figures / Tables:

Figure 1 Figure 1: Convention of angles for both orientations 𝜙=0° , 90° , S denotes the source and R the receiver, (a) 𝜃 is the angle between the normal to the bedding $\vec n$ and the raypath, (b) 𝜓 refers to the angle between the radial stress 𝜎3 and the raypathmore » in the bedding plane for orientation 𝜙=0° , and (c) example of a prepared sample.« less

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    Works referencing / citing this record:

    Experimental identification of the transition from elasticity to inelasticity from ultrasonic attenuation analyses
    journal, June 2018