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

Table 1

Mineralogy of shale samples (the samples are cored from the same place as mentioned before [17, 24]).

X-ray diffraction analysis	Value (%, /)
Brittleness component (total)	72.95
Quartz	55.50
Feldspar	14.57
Cristobalite	2.88
Clay component (total)	5.85
Kaolinite	1.00
Illite	1.42
Smectite	3.43
Others (total)	20.97
Pyrite	4.08
Calcite	4.44
Muscovite	5.57
Annite	1.41
Marble	5.10
Braunite	0.37