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==Terminology and mercury injection systematics==

==Terminology and mercury injection systematics==

[[File:charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_3.jpg|l300px|thumb|{{figure_number|3}}Mercury injection capillary pressure curve terminology.]]

[[File:charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_3.jpg|300px|thumb|{{figure_number|3}}Mercury injection capillary pressure curve terminology.]]

Mercury injection capillary pressure data are acquired by injecting mercury into an evacuated, cleaned, and extracted core plug. Mercury injection pressure is increased in a stepwise manner, and the percentage of rock pore volume saturated by mercury at each step is recorded after allowing sufficient time for equilibrium to be reached. The pressure is then plotted against the mercury saturation ([[:File:charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_3.jpg|Figure 3]]), resulting in the injection curve (which is also called the drainage curve because the wetting phase is being drained from the sample).

Mercury injection capillary pressure data are acquired by injecting mercury into an evacuated, cleaned, and extracted core plug. Mercury injection pressure is increased in a stepwise manner, and the percentage of rock pore volume saturated by mercury at each step is recorded after allowing sufficient time for equilibrium to be reached. The pressure is then plotted against the mercury saturation ([[:File:charles-l-vavra-john-g-kaldi-robert-m-sneider_capillary-pressure_3.jpg|Figure 3]]), resulting in the injection curve (which is also called the drainage curve because the wetting phase is being drained from the sample).