Research Article
A Damage Constitutive Model for the Effects of CO2-Brine-Rock Interactions on the Brittleness of a Low-Clay Shale
Table 4
The mechanical values of shales obtained from stress-strain curves.
| Condition | Soaking time (day) | Peak axial stress (MPa) | Axial strain at failure point (%) | Young’s modulus (GPa) | Axial strain (%) | | | |
| Intact | — | 50.27 | 0.789 | 6.91 | 0.552 | 0.631 | 0.710 | Subcritical CO2 + NaCl | 10 | 40.98 | 0.862 | 5.48 | 0.603 | 0.690 | 0.776 | 20 | 31.61 | 0.872 | 4.23 | 0.610 | 0.698 | 0.785 | 30 | 20.57 | 0.943 | 2.48 | 0.660 | 0.754 | 0.849 | Supercritical CO2 + NaCl | 10 | 36.15 | 0.842 | 4.60 | 0.589 | 0.674 | 0.758 | 20 | 24.50 | 0.993 | 2.89 | 0.695 | 0.794 | 0.894 | 30 | 18.90 | 1.048 | 2.06 | 0.734 | 0.838 | 0.943 |
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