Brittleness Evaluation of Shale Based on the Brazilian Splitting Test

Table 3

Comprehensive brittleness index of shale.

Coring depth	Sample number	Comprehensive brittleness index
Outcrop	A-1	0.32
	A-2	0.5
2320.80 m–2322.37 m	B-1	0.71
	B-3	0.59
	B-4	0.43
	B-7	0.68
	B-8	0.62
	B-9	0.58
2320.80 m–2322.37 m	B-10	0.42
	B-12	0.61
2408.08 m–2412.48 m	C-2	0.75
	C-4	0.87
2504.10 m–2505.91 m	D-1	0.56
	D-2	0.80
	D-3	0.54
	D-4	0.63