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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}}Underpressure caused by burial.]]
==Burial==
[[file:formation-fluid-pressure-and-its-application_fig5-3.png|thumb|300px|{{figure number|1}}Underpressure caused by burial.]]
if the encapsulated unit is buried deeper, its original pressure is carried to a higher pressure environment. If the rock cannot compact, the trapped pressure is abnormally low for the new depth.
if the encapsulated unit is buried deeper, its original pressure is carried to a higher pressure environment. If the rock cannot compact, the trapped pressure is abnormally low for the new depth.