[[file:formation-fluid-pressure-and-its-application_fig5-36.png|300px|thumb|{{figure number|2}}Potentiometric surface for hydrodynamic updip and downdip flow and hydrostatic no flow. From Schowalter;<ref name=Schowalter1979>Schowalter, T. T., 1979, [http://archives.datapages.com/data/bulletns/1977-79/data/pg/0063/0005/0700/0723.htm Mechanics of secondary hydrocarbon migration and entrapment]: AAPG Bulletin, vol. 63, no. 5, p. 723–760. ''Covers many fluid behavior principles, including pressure, with broad application to petroleum exploration.''</ref> courtesy AAPG.]] | [[file:formation-fluid-pressure-and-its-application_fig5-36.png|300px|thumb|{{figure number|2}}Potentiometric surface for hydrodynamic updip and downdip flow and hydrostatic no flow. From Schowalter;<ref name=Schowalter1979>Schowalter, T. T., 1979, [http://archives.datapages.com/data/bulletns/1977-79/data/pg/0063/0005/0700/0723.htm Mechanics of secondary hydrocarbon migration and entrapment]: AAPG Bulletin, vol. 63, no. 5, p. 723–760. ''Covers many fluid behavior principles, including pressure, with broad application to petroleum exploration.''</ref> courtesy AAPG.]] |