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

Table 4

Types and contents of intragranular pores in deep mine sandstone.

Sandstone type	Feldspar (%)	Rock debris (%)	Cleavage (%)
Jurassic sandstone	0.5-2.5	0.2	0.0
Shihezi sandstone	0.5-2.5	0.2-0.5	0.1-0.5
Shanxi sandstone	0.2-1.5	0.1-0.2	0.1-0.2

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