Microscale Mineral and Pore Structure Characterization of the Low-Permeability Sandstone in the Ordos Basin, China

Figure 3

Diagenesis of Chang 2 reservoir in the study area. (a) Cementation of microcrystalline quartz (MQ), kaolinite (Ka), illite (Il), and chlorite (Ch) (N39, 1218.6 m); (b) quartz enlargement (QE), intergranular kaolinite (Ka), and illite cementation (Il) (Z140, 1473.9 m); (c) feldspar dissolution (FD) and intergranular pores (IP) (N9, 1210 m); (d) ankerite (An) and feldspar dissolution (FD) (Z140, 1473.9 m).

(a)

(b)

(c)

(d)