The Influential Factors and Characteristics of Tight Sandstone Gas Reservoir: A Case Study in Ordos Basin in China

Table 1

Mercury-injection data of the Shan-2 Member of the Shanxi Formation in the research area.

Type	, %	, 10^-3μm^2	, MPa	, MPa	, μm	, %		SN
I	>6.0	>1.0	<0.5	<1.5	>0.5	>80.0	IP, DP-IP	7
II	5.0~9.0	0.1~2.0	0.5~1.5	2.0~10	0.1~0.5	70-90	DP-IP, IP-DP	24
III	4.0~7.5	0.1~0.5	1.0~10.0	15~30	0.05~0.1	50~80	DP, MP-DP	30
IV	<6.0	/	/	/	/	<50.0	MF, DP-MF	9

Φ: porosity; K: permeability; P_d: displacement pressure; P₅₀: medium pressure; r₅₀: medium radius; S_Hgmax: maximum mercury saturation; P_C: pore combination; SN: sample number; IP: intergranular pore; DP: dissolution pore; MP: micropore; MF: microcrack.