Analysis and Calculation of Threshold Pressure Gradient Based on Capillary Bundle

Table 1

The fundamental physical parameters of core samples.

Core number	Diameter (cm)	Length (cm)	Gas logging permeability (10^−3 μm^2)	Porosity (%)
P11	2.516	5.242	1.97	13.43
P12	2.508	5.268	2.39	13.55
P13	2.516	5.594	3.45	13.47
P14	2.506	5.164	8.93	14.99
P15	2.504	6.242	9.96	14.43
P16	2.504	5.798	11.81	15.38
P17	2.512	5.20	14.96	15.27
P18	2.502	5.934	26.1	16.13
P19	2.504	6.046	28.91	17.86
P20	2.504	5.438	31.07	18.12