Fig. 2

Microscopic characteristics of scanning electron microscope and thin section of reservoir rocks. (a) Intragranular and intergranular pores; (b) Intergranular pores in illite; (c) Spherical organic matter pore; (d) Bedding and microfractures; (e) Quartz particle clumps; (f) Organic matter accompanied by pyrite development pores.