Pore throat structure and classification of Paleogene tight reservoirs in Jiyang depression, Bohai Bay Basin, China

WANG Yongshi,GAO Yang,FANG Zhengwei

Table 5 Paleogene tight sandstone and sandy conglomerate reservoir classification scheme based on pore throat structure in the Jiyang depression.

Reservoir type	Grade	Permeability/ 10^-3 μm²	R₀/μm		R₅₀/μm		R_a/μm
Reservoir type	Grade	Permeability/ 10^-3 μm²	Dominant peak	Secondary peak	Dominant peak	Secondary peak	R_a/μm
Tight sandstone	I	1.5-3.0	2.0-2.6	1.4-1.6	0.10-0.55		0.6-1.0
	II	0.8-1.5	2.0-2.6	1.4-1.6	0.05-0.3		0.4-0.7
	III	0.3-0.8	1.2-1.6	0.2-0.8	0.05-0.20		0.2-0.4
	IV	<0.3	<0.8		<0.10		<0.2
Tight sandy conglomerate	I	1.5-3.0	2.2-3.2	1.2-1.4	0.30-0.55	0.05-0.15	0.5-1.0
	II	0.8-1.5	2.2-3.2	1.2-1.6	0.05-0.25		0.4-0.7
	III	0.3-0.8	1.2-1.6	2.2-2.6	<0.15		0.2-0.4
	IV	<0.3	<0.8		<0.10		<0.2