Micropore Characteristics and Geological Significance of Shale Reservoirs: Case Study of Fuling Shale Gas in Sichuan Basin, China

Table 3

Classification of micropore types.

Cause	Pore type	Aperture (nm)	Distribution characteristics
Inorganic pore	Intercrystalline pore of brittle mineral	0.2-0.3	Between brittle mineral crystals
	Intergranular pores of clay minerals	1-2	Between small particles in the aggregate of clay minerals
	Interlaminar pores of clay minerals	0.8-2	Between the crystalline layers of clay minerals
	Intermolecular pores of clay minerals	0.3-0.6	Between the molecules of clay minerals
Organic pore	Organic matter skeleton pores	1-2	Organic matter within the skeleton