Conventional Mercury Penetration and Constant Velocity Mercury Penetration Experiments Are Used to Quantitatively Characterize the Difference in Micropore Structure in Low Permeability Reservoirs and Its Influence on Movable Fluid Saturation

Table 1

Typical parameters of micropore structure (displacement pressure and mercury saturation).

Sample number	Permeability (×10^-3 μm^2)	Porosity (%)	Displacement pressure (MPa)			Maximum mercury saturation		Mercury saturation at 6.89 MPa	①-②	②-③
			①	②	①-②	①	②	③
X10	1.09	12.1	0.30	0.20	0.10	87.4	59.5	41.5	27.9	18.0
X13	1.22	12.0	0.40	0.30	0.10	88.6	46.6	42.5	42.0	4.1
X15	0.32	9.3	0.70	0.60	0.20	92.6	42.9	40.6	49.6	2.3
X18	0.17	9.0	1.10	0.90	0.30	87.4	53.5	41.5	33.9	11.9
X26	1.01	11.2	0.50	0.40	0.00	90.0	49.1	44.8	41.0	4.3
X27	0.19	9.0	1.20	1.00	0.20	87.9	32.5	31.2	55.4	1.3
X28	0.21	9.0	1.20	0.80	0.30	83.3	52.6	44.1	30.6	8.6
X39	0.69	11.5	0.30	0.30	0.00	88.6	46.6	42.4	42.1	4.1
D8	0.04	7.7	1.83	1.23	0.61	58.5	33.2	23.2	25.3	10.0
D18	0.10	10.9	1.83	1.47	0.36	72.4	42.7	36.6	29.7	6.1
D23	0.06	11.9	1.83	1.05	0.78	61.9	45.6	17.6	16.3	28.0
D44	0.19	8.3	1.49	0.43	1.06	60.3	47.0	40.8	13.3	6.2
D47	0.01	4.7	2.86	1.47	1.39	52.2	35.7	11.0	16.5	24.7

Notes: ①, conventional mercury penetration; ②, constant velocity mercury penetration; ③, mercury saturation at 6.89 MPa.