Changes

! Regime || Class || Subclass || Family

! Regime || Class || Subclass || Family

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| rowspan = 4 | ''Fluid-composition traps''; Result from a chemical property of the trapped oil or gas. || rowspan = 3 | ''Viscosity traps;'' Petroleum can be trapped by the presence of barriers created by highly [[Wikipedia:Viscosity|viscous]] oil ([[asphalt]], [[tar]]) or solid hydrocarbons ([[albertite]], [[gilsonite]], or [[grahamite]]). || ''Tar Seals'' || ''Bacterial degradation;'' Updip tar seal created by [[bacteria degradation]] of the hydrocarbons, preferentially removing the [[lighter fractions]].

| rowspan = 4 | ''Fluid-composition traps''; Result from a chemical property of the trapped oil or gas. || rowspan = 3 | ''[[Viscosity]] traps;'' Petroleum can be trapped by the presence of barriers created by highly viscous oil ([[asphalt]], [[tar]]) or solid hydrocarbons ([[albertite]], [[gilsonite]], or [[grahamite]]). || ''Tar Seals'' || ''Bacterial degradation;'' Updip tar seal created by [[bacteria degradation]] of the hydrocarbons, preferentially removing the [[lighter fractions]].

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| colspan = 2 | ''Disseminated;'' Tar or asphalt fills the pores of [[shale]]s, [[sandstone]]s, or [[carbonate]]s. These traps are often called [[tar sands]], [[oil shale]]s, bituminous sandstones, or bituminous limestones.

| colspan = 2 | ''Disseminated;'' Tar or asphalt fills the pores of [[shale]]s, [[sandstone]]s, or [[carbonate]]s. These traps are often called [[tar sands]], [[oil shale]]s, bituminous sandstones, or bituminous limestones.