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  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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Pressure traps are those in which changes in fluid pressures control or modify trapping elements. Changes from normal pressure gradients to overpressures can create or destroy pressure seals and create isolated [[pressure compartments]] that may define trap boundaries. In addition, the presence of a hydrodynamic gradient can cause tilted oil–water and gas–water contacts, which define trap boundaries.

Pressure traps are those in which changes in fluid pressures control or modify trapping elements. Changes from normal [[pressure gradient]]s to [[overpressure]]s can create or destroy [[Pressure compartment seals|pressure seals]] and create isolated [[pressure compartments]] that may define trap boundaries. In addition, the presence of a hydrodynamic gradient can cause tilted oil–water and gas–water contacts {See [[Fluid contacts]]), which define trap boundaries.

==Classes and families==

==Classes and families==