Pressure trap regime

	Exploring for Oil and Gas Traps
Series	Treatise in Petroleum Geology
Part	Traps, trap types, and the petroleum system
Chapter	Classification of exploration traps
Author	Richard R. Vincelette, Edward A. Beaumont, Norman H. Foster
Link	Web page
Store	AAPG Store

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 {See Fluid contacts), which define trap boundaries.

Classes and families

The outline below presents the hierarchy and definitions for pressure traps.

System	Regime	Class	Family	Variety
Fluidic traps	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.
Fluidic traps	Pressure traps	Tilted oil–water contacts; Boundary defined by tilted oil–water or gas–water contact.	Hydrodynamic traps; Tilted hydrocarbon–water contact in accumulation due to hydrodynamic gradient.

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Pressure trap regime