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→Classes and families
! System || Regime || Class || Family || Variety
! System || Regime || Class || Family || Variety
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| rowspan = 2 | Fluidic traps || rowspan = 2 | Pressure traps || Overpressure traps; Limits controlled by change from overpressured reservoir to normally pressured reservoir. Common in some fractured reservoirs in which overpressures were required to generate and support open fractures in the subsurface. || High-pressure traps || Hydrocarbon generation; Overpressure due to volume increase in conversion of kerogen to oil.
| rowspan = 2 | Fluidic traps || rowspan = 2 | Pressure traps || Overpressure traps; Limits controlled by change from overpressured reservoir to normally pressured reservoir. Common in some fractured reservoirs in which overpressures were required to generate and support open fractures in the subsurface. || High-pressure traps || [[Petroleum generation|Hydrocarbon generation]]; Overpressure due to volume increase in conversion of kerogen to oil.
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| Tilted oil–water contacts; Boundary defined by tilted oil–water or gas–water contact. || colspan = 2 | Hydrodynamic traps; Tilted hydrocarbon–water contact in accumulation due to hydrodynamic gradient.
| Tilted oil–water contacts; Boundary defined by tilted oil–water or gas–water contact. || colspan = 2 | Hydrodynamic traps; Tilted hydrocarbon–water contact in accumulation due to hydrodynamic gradient.