The Occurrence of Adsorbed Tight Oil and Its Effect on Porosity and Permeability Reduction of Triassic Lacustrine Sandstone Reservoir

Table 2

Pore structure parameters of HPMI.

Samples	Depths (m)	Porosity (%)	Permeability (×10^-3 μm^2)	Average of throat radius (μm)	Sorting coefficient (a.u.)	Displacement pressure (MPa)	Median pressure (MPa)	Efficiency of mercury withdrawal (%)	The most mercury injection saturation (%)
B455-2-46	2147.87	23.57	9.338	3.3	0.38	0.03	1.95	29.63	84.38
B455-2-60	2149.47	16.63	2.901	1.56	0.33	0.05	5.18	33.44	83.1
B436-7-33	2192.60	12.03	0.584	0.275	2.45	0.57	7.82	33	90.47
B436-7-38	2193.20	13.38	0.827	0.42	0.26	0.3	4.9	33.72	85.1
B456-6-6	2134.20	14.35	0.639	0.5	0.24	0.3	4.32	31.76	89.62
B280-13-3	2213.35	13.02	0.244	0.07	1.55	3.72	20.7	34.96	88.119