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| isbn = 0-89181-602-X
| isbn = 0-89181-602-X
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In settings with extreme overpressure, pore-water pressure approaches the pressure required for natural hydraulic fracturing. If the petroleum column is thick enough, the sum of the [[capillary pressure]] and fluid pressure can equal or exceed the pressure needed to fracture the rock. The result is natural hydraulic fracturing: the seal becomes hydro-fractured and the petroleum leaks.
In settings with extreme overpressure, pore-water pressure approaches the pressure required for natural hydraulic fracturing. If the petroleum column is thick enough, the sum of the [[capillary pressure]] and fluid pressure can equal or exceed the pressure needed to [[fracture]] the rock. The result is natural hydraulic fracturing: the seal becomes hydro-fractured and the petroleum leaks.
==Characteristics==
==Characteristics==