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→Critical water saturation
==Critical water saturation==
==Critical water saturation==
[[file:predicting-reservoir-system-quality-and-performance_fig9-28.png|thumb|{{figure number|3}}See text for explanation.]]
[[file:predicting-reservoir-system-quality-and-performance_fig9-28.png|300px|thumb|{{figure number|3}}Relative permeability relationships for rock with different pore types.]]
The critical S<sub>w</sub> value is different for each port type. Curve A in Figure 9-28 represents rocks with macroporosity. It has a critical S<sub>w</sub> less than 20%. Curve B represents a rock (continued) with mesoporosity. Mesoporous rocks have a critical S<sub>w</sub> of 20–60%. Curve C represents rocks with microporosity. They have a critical S<sub>w</sub> of 60–80%.
The critical S<sub>w</sub> value is different for each port type. Curve A in Figure 9-28 represents rocks with macroporosity. It has a critical S<sub>w</sub> less than 20%. Curve B represents a rock (continued) with mesoporosity. Mesoporous rocks have a critical S<sub>w</sub> of 20–60%. Curve C represents rocks with microporosity. They have a critical S<sub>w</sub> of 60–80%.