Changes

==Procedure: estimating gas pressure gradient==

==Procedure: estimating gas pressure gradient==

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file:formation-fluid-pressure-and-its-application_fig5-8.png|{{figure number|1}}Pseudoreduced temperature and pressure. From Schowalter, 1979; courtesy AAPG.

file:formation-fluid-pressure-and-its-application_fig5-8.png|{{figure number|1}}Pseudoreduced temperature and pressure. From Schowalter;<ref name=Schowalter1979>Schowalter, T.T., 1979, Mechanics of secondary hydrocarbon migration and entrapment: AAPG Bulletin, vol. 63, no. 5, p. 723–760.</ref> courtesy AAPG.

file:formation-fluid-pressure-and-its-application_fig5-9.png|{{figure number|2}}Estimate compressibility factor, ''z''. From Schowalter, 1979; courtesy AAPG.

file:formation-fluid-pressure-and-its-application_fig5-9.png|{{figure number|2}}Estimate compressibility factor, ''z''. From Schowalter;<ref name=Schowalter1979 /> courtesy AAPG.

file:formation-fluid-pressure-and-its-application_fig5-10.png|{{figure number|3}}Estimate gas density. From Schowalter, 1979; courtesy AAPG.

file:formation-fluid-pressure-and-its-application_fig5-10.png|{{figure number|3}}Estimate gas density. From Schowalter;<ref name=Schowalter1979 /> courtesy AAPG.

file:formation-fluid-pressure-and-its-application_fig5-11.png|{{figure number|4}}Average gas chart. Copyright: Gearhart-Owens, 1970.{{citation needed}}

file:formation-fluid-pressure-and-its-application_fig5-11.png|{{figure number|4}}Average gas chart. Copyright: Gearhart-Owens.<ref name=G-O>Gearhart-Owens Industries, 1972, GO Log Interpretation Reference Data Handbook:

Fort Worth, Gearhart-Owens Industries Inc., 226 p.</ref>

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