Pore Structure Differentiation between Deltaic and Epicontinental Tight Sandstones of the Upper Paleozoic in the Eastern Linxing Area, Ordos Basin, China

Table 3

Pore evolution process of lithic arenite and feldspathic lithic arenite.

Sandstone type	Primary porosity (%)	Compaction porosity loss (%)	Cementation porosity loss (%)	Dissolution increased porosity (%)
Lithic arenite	31.3	23.8	7.4	6.8
Feldspathic lithic arenite	27.8	21.8	6.0	2.3