Effect of Microscopic Pore Throat Structure on Displacement Characteristics of Lacustrine Low Permeability Sandstone: A Case Study of Chang 6 Reservoir in Wuqi Oilfield, Ordos Basin

Table 3

Classification of pore structure parameters from HPMI.

Parameter type	Type I		Type II		Type III		Type IV
	Distribution range	Average value	Distribution range	Average value	Distribution range	Average value	Distribution range	Average value
Porosity (%)	11.16~12.11	11.6	8.98~11.50	9.9	8.97~9.01	8.99	4.99~10.43	7.84
Permeability (×10^-3 μm^2)	0.69~1.09	0.93	0.21~0.72	0.39	0.17~0.21	0.19	0.04~0.19	0.11
Displacement pressure (MPa)	0.29~0.46	0.35	0.45~0.74	0.67	1.14~1.17	1.16	1.82~4.49	3.08
Maximum mercury saturation (%)	87.45~90.02	88.71	85.10~92.43	88.17	83.25~87.89	86.17	71.92~87.80	81.85
Median radius (μm)	0.08~0.22	0.16	0.07~0.20	0.13	0.05~0.12	0.07	0.01~0.03	0.02
Maximum pore throat radius (μm)	1.60~2.54	2.22	0.99~1.62	1.13	0.63~0.64	0.64	0.16~0.40	0.27
Sorting coefficient	2.40~2.91	2.61	1.81~2.46	2.28	2.22~2.54	2.4	2.01~3.55	2.64
Mean coefficient	10.32~10.73	10.53	10.62~11.51	10.98	10.50~11.75	11.29	10.01~13.26	11.88
Proportion	21.00%		36.00%		21.00%		21.00%