Study on Non-Darcian Flow in Interlayer Shear Weakness Zones in the Basalt by High-Pressure Packer Tests

Table 4

The obtained equivalent permeability coefficient under different injection pressure by two methods in borehole CZK51.

Test section status	Injection pressure (MPa)	Equivalent permeability coefficient (cm/s)
		Secant method	Tangent method
Undamaged	0.3	1.73 × 10^-6	6.40 × 10^-6
	0.5	8.61 × 10^-6	3.19 × 10^-5
	0.7	5.06 × 10^-5	1.88 × 10^-4
Damaged	0.7	7.85 × 10^-5	1.91 × 10^-4
	1.0	2.60 × 10^-4	6.33 × 10^-4
	1.5	3.56 × 10^-4	8.68 × 10^-4