Study on Micro-Nano Pore Characteristics and Classification of Tight Sandstone Reservoir Based on Q-Cluster

Figure 2

The characteristic of micropores in tight oil reservoir in the study area. (a) Intragranular dissolved pores within quartz (Qa) and feldspar (Fsp) at depth of 1294.8 m of Well M2; (b) intragranular dissolved pores in feldspar (Fsp) and calcite cement (Ca) at depth of 2058.5 m of Well S39; (c) intergranular dissolved pores in debris particles (Chl) and intragranular dissolved pores in feldspar (Fsp) at depth of 1667.5 m of Well Y214; (d) residual intergranular pores at the edge of quartz (Qa) and debris particles (Chl) at depth of 1779.7 m of Well M404; (e) intergranular honeycomb micropores of chlorite (chl) and illite (i) at depth of 1495.5 m of Well P44; (f) The microfractures cut through quartz (Qa) at depth of 1606.9 m of Well Y358; (g) curved throat among quartz (Qa) at depth of 1369.7 m of Well X67; (h) the tube bundle channel within illite (i) at depth of 1151.5 m of Well Z71; and (i) neck-constricted throat between quartz (Qa) and feldspar(Fsp) at depth of 1243 m of Well P67.

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