Experimental Study on the Effect of Supercritical CO₂ on Mechanical Properties and Fracture Characteristics of Longmaxi Shale

Table 5

Clay analysis results of the three experiments (XRD).

Test name	Clay contents (%)
	Smectite	I/S	Illite	Kaolinite	Chlorite
scCO2 test	33.5	4.1	19.2	16.1	27.1
	32.2	6.2	21.3	14.5	25.8
	28.4	4.5	21.0	16.8	29.3
	34	2.7	20.4	15.2	27.7
	31.3	4.8	21.1	16.4	26.4
	32.9	2.7	19.6	16.9	27.9
	32.2	2.8	20.5	16.1	28.4
N2 test	22.8	2.5	31.7	17.2	25.8
	23.1	3.2	29.2	18.3	26.2
	23.4	2.1	30.1	17.9	26.5
	24.6	2.4	32.4	15.7	24.9
	24.4	4.5	29.3	16.7	25.1
	25.5	1.7	28.5	16.9	27.4
	26.3	3.3	30.1	15.9	24.5
Helium test	24.5	3.4	29.3	16.1	26.7
	25.8	2.0	31.8	14.6	25.8
	26.1	4.6	29.7	15.7	23.9
	25.9	3.7	27.5	16.2	26.7
	23.7	1.4	31.2	17.4	26.3
	25.4	2.6	29.8	16.8	25.4
	22.8	1.6	31.6	15.9	28.1