Formation Mechanism of “Large-Area Sweating” Water Seepage from Deep Mine Sandstone Pores

Table 3

Types and contents of intergranular pores in deep mine sandstone.

Sandstone types	Primary pores (%)		Secondary pores (%)
	Original	Residual	Dissolved	Matrix pores
Jurassic sandstone	2.5-9.0	0.1	0.1-0.5	0.5
Shihezi sandstone	0.2	0.3-2.0	0.2-1.3	0.1-1.5
Shanxi sandstone	0.1-3.5	0.2-1.5	0.1-0.8	0.1-0.3

The contents in this table indicate the visual area percentage of the sandstone samples.