Study on Micro-Nano Pore Characteristics and Classification of Tight Sandstone Reservoir Based on Q-Cluster

Table 4

Classification standards of micropore structure in tight oil reservoir.

Pore structure; Parameter	I-type		II-type		III-type
	Range	Average	Range	Average	Range	Average
Permeability/×10^-3 μm^2	0.80~9.32	1.89	0.30~0.80	0.54	0.02~0.30	0.04
Pore radius median/μm	1.00~3.0	1.92	0.30~1.00	0.63	0.01~0.30	0.16
Porosity/%	10.00~14.50	12.60	8.00~10.00	8.62	3.40~8.00	5.91
Maximum pore throat radius/μm	1.23~9.20	2.77	0.55~1.52	0.43	0.03~0.58	0.18
Average pore throat radius/μm	0.23~4.00	0.76	0.06~0.54	0.37	0.01~0.09	0.06
Displacement pressure/MPa	2.88~15.17	5.36	12.00~45.32	28.62	41.32~85.47	52.28
Median pressure/MPa	1.58~5.15	3.50	9.54~28.58	17.73	27.32~37.91	21.83
Mercury removal efficiency/%	53.18~69.61	57.32	39.23~54.22	44.32	32.54~41.91	38.13
Relative sorting coefficient	20.00~110.00	45.00	12.00~19.00	17.00	1.00~13.00	8.00