A Damage Constitutive Model for the Effects of CO₂-Brine-Rock Interactions on the Brittleness of a Low-Clay Shale

Figure 3

The axial stress-axial strain curves for intact sample and samples with subcritical CO₂ + NaCl solution (a) and supercritical CO₂ + NaCl solution (b). “Sub-10” means samples soaked in subcritical CO₂ and NaCl for 10 days. “Sup-10” means samples soaked in supercritical CO₂ and NaCl for 10 days.

(a)

(b)