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  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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The static oil pressure gradient is dependent on oil [[density]]. Subsurface density of oil or condensate depends on [[Oil composition|composition]], amount of [[dissolved gas]]es, [[temperature]], and [[pressure]]. [[Oil and condensate analysis|Oil or condensate density]] can be estimated to useful accuracy if stock tank [[API gravity]] and [[Petroleum reservoir fluid properties#Solution gas-oil ratio (GOR)|solution gas-oil ratio (GOR)]] are known.<ref name=ch05r15>Schowalter, T., T., 1979, [http://archiveSolution gas-oil ratio (GOR)s.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>

The static oil pressure gradient is dependent on oil [[Wikipedia:Density|density]]. Subsurface density of oil or condensate depends on [[Oil composition|composition]], amount of [[dissolved gas]]es, [[Wikipedia:Temperature|temperature]], and [[Wikipedia:Pressure|pressure]]. [[Oil and condensate analysis|Oil or condensate density]] can be estimated to useful accuracy if stock tank [[API gravity]] and [[Petroleum reservoir fluid properties#Solution gas-oil ratio (GOR)|solution gas-oil ratio (GOR)]] are known.<ref name=ch05r15>Schowalter, T., T., 1979, [http://archiveSolution gas-oil ratio (GOR)s.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>

==Estimating oil pressure gradients==

==Estimating oil pressure gradients==