Characterization of Nanoscale Pores in Tight Gas Sandstones Using Complex Techniques: A Case Study of a Linxing Tight Gas Sandstone Reservoir

Figure 4

SEM results of three tight gas sandstone samples: (a) full microscopic view of tight gas, interparticle pores ranging 1-5 microns (LX3); (b) different stages of pyrite aggregation and platey biotite (LX3); (c) platey and filamentous illite with pore ranging around 1-3 microns (LX3); (d) full microscopic view of tight gas, interparticle pores ranging around 1-5 microns and poor connectivity (LX1); (e) different stages of pyrite distributed on the surface of the particles (LX1); (f) platey kaolinite filling interparticle pore (LX1); (g) full microscopic view of tight gas with rich white pyrite (LX2); (h) platey illite filling interparticle pores and forming 2-4 micron pores (LX2); (i) thick platey dickite and filamentous illite filling interparticle pores (LX2).

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