Research Article
A Damage Constitutive Model for the Effects of CO2-Brine-Rock Interactions on the Brittleness of a Low-Clay Shale
Table 3
Values of uniaxial compressive strength (UCS) and Young’s modulus (
) for all tested samples.
| | Specimen | UCS (MPa) | Average UCS (MPa) | | Young’s modulus (GPa) | Average (GPa) | | | Standard deviation (MPa) | Standard deviation (GPa) |
| | Intact | Number 1 | 50.27 | 53.30 | — | 6.91 | 6.47 | — | | Number 2 | 56.33 | (3.03) | 6.02 | (0.45) | | Subcritical CO2 + NaCl | 10 days | | Number 1 | 40.98 | 42.22 | −20.79% | 5.48 | 5.62 | −13.14% | | Number 2 | 43.46 | (1.24) | 5.75 | (0.14) | | 20 days | | Number 1 | 31.61 | 34.15 | −35.93% | 4.23 | 4.45 | −31.22% | | Number 2 | 36.69 | (2.54) | 4.67 | (0.22) | | 30 days | | Number 1 | 20.57 | 23.03 | −56.79% | 2.48 | 2.67 | −58.73% | | Number 2 | 25.49 | (2.46) | 2.86 | (0.19) | | Supercritical CO2 + NaCl | 10 days | | Number 1 | 36.15 | 37.75 | −29.17% | 4.60 | 4.79 | −25.97% | | Number 2 | 39.34 | (1.60) | 4.97 | (0.19) | | Number 3 | 11.89 | Excluded | | 0.93 | | | | 20 days | | Number 1 | 24.50 | 25.28 | −52.57% | 2.89 | 3.03 | −53.17% | | Number 2 | 26.06 | (0.78) | 3.16 | (0.13) | | 30 days | | Number 1 | 18.90 | 20.51 | −61.52% | 2.06 | 2.43 | −62.44% | | Number 2 | 22.11 | (1.61) | 2.79 | (0.37) | | Number 3 | 12.33 | Excluded | | 1.16 | | |
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