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Underpressure can be caused by burial or heat decrease.
Underpressure can be caused by burial or heat decrease.
[[file:formation-fluid-pressure-and-its-application_fig5-3.png|thumb|{{figure number|1}}See text for explanation.]]
==Burial==
==Burial==
As long as a rock unit remains encapsulated by impermeable rocks, it becomes underpressured by burial as faulting or as downwarp occurs.
As long as a rock unit remains encapsulated by impermeable rocks, it becomes underpressured by burial as faulting or as downwarp occurs.
The diagrams below illustrate this phenomenon.
The diagrams in [[:file:formation-fluid-pressure-and-its-application_fig5-3.png|Figure 1]] illustrate this phenomenon.
[[file:formation-fluid-pressure-and-its-application_fig5-3.png|thumb|{{figure number|5-3}}See text for explanation.]]
==Heat decrease==
==Heat decrease==