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==Classes and families==
==Classes and families==
The outline below presents the hierarchy and definitions for pressure traps.
The outline below presents the hierarchy and definitions for pressure traps.
{| class=wikitable
|-
! System || Regime || Class || Family || Variety
|-
| 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.
|-
| 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.
|}
'''System:''' Fluidic traps
'''System:''' Fluidic traps