Changes

==Pore throat profiles==

==Pore throat profiles==

[[file:predicting-reservoir-system-quality-and-performance_fig9-12.png|thumb|{{figure number|2}}Curve drawn through the points in Figure 1.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-12.png|300px|thumb|{{figure number|2}}Curve drawn through the points in Figure 1.]]

A curve is drawn through the measured points at test completion. This capillary pressure curve also represents a pore throat size profile for the tested sample. It relates a given pore throat size to its capillary resistance (P_c). [[:file:predicting-reservoir-system-quality-and-performance_fig9-12.png|Figure 1]] shows the curve drawn through the points in [[:file:predicting-reservoir-system-quality-and-performance_fig9-11.png|Figure 1]].

A curve is drawn through the measured points at test completion. This capillary pressure curve also represents a pore throat size profile for the tested sample. It relates a given pore throat size to its capillary resistance (P_c). [[:file:predicting-reservoir-system-quality-and-performance_fig9-12.png|Figure 2]] shows the curve drawn through the points in [[:file:predicting-reservoir-system-quality-and-performance_fig9-11.png|Figure 1]].

==Converting capillary pressure to pore throat size==

==Converting capillary pressure to pore throat size==

==Example==

==Example==

[[file:predicting-reservoir-system-quality-and-performance_fig9-13.png|thumb|{{figure number|3}}Example of a mercury capillary pressure test.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-13.png|300px|thumb|{{figure number|3}}Example of a mercury capillary pressure test.]]

Using the curve in [[:file:predicting-reservoir-system-quality-and-performance_fig9-13.png|Figure 3]], if S_w = 20% (point 1), then the mercury capillary pressure (P_c) that must be overcome to enter pore throats at that point on the curve is [[pressure::200 psi]] (point 2). Converting mercury P_c to hydrocarbon column height (''h''):

Using the curve in [[:file:predicting-reservoir-system-quality-and-performance_fig9-13.png|Figure 3]], if S_w = 20% (point 1), then the mercury capillary pressure (P_c) that must be overcome to enter pore throats at that point on the curve is [[pressure::200 psi]] (point 2). Converting mercury P_c to hydrocarbon column height (''h''):