Study on Postfrac Softening Mechanism of Deep Marine Shale Reservoir in South Sichuan Basin

Table 1

Data of cores for the Brinell hardness measurement.

Block	Well	Burial depth (m)	Layer
Changning	N1	2500-2520	Long-1^4
	N2	2220-2240	Long-1^2
	N3	4100-4300	Long-1^1~4
Weiyuan	W1	2500-2520	Long-1^1~2
Luzhou	Y1	4140-4160	Long-1^1, Long-1^3, Wufeng
	Y2	4090-4140	Long-1^1, Long-1^4
Yuxi	H1	4020-4080	Long-1^1~3