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Petroleum loss across faults is considered spillage, not leakage, because faults are part of the trapping geometry. Petroleum shows in spilled accumulations are usually immobile at relatively constant [[Overview of routine core analysis#Residual fluid saturation|residual saturation]] over a thick section of the reservoir, with a paleo-fluid contact located near the base of the residual saturation. Petroleum in structurally spilled accumulations is relatively unaltered; oil in hydrodynamically spilled accumulations, on the other hand, is usually altered.
Petroleum loss across faults is considered spillage, not leakage, because faults are part of the trapping geometry. Petroleum shows in spilled accumulations are usually immobile at relatively constant [[Overview of routine core analysis#Residual fluid saturation|residual saturation]] over a thick section of the reservoir, with a paleo-fluid contact located near the base of the residual saturation. Petroleum in structurally spilled accumulations is relatively unaltered; oil in hydrodynamically spilled accumulations, on the other hand, is usually altered.
The following changes can occur due to spillage:
* Where [[Calculating charge volume|charging]] occurred with large-scale [[deformation]], large volumes of rock not in present-day [[trap]]s may have acquired [[residual petroleum saturation]] as porous intervals occupied former traps.
* Structural growth might have allowed [[Migration|migrating]] petroleum to escape to the surface. Once lost, the petroleum is no longer available to fill accumulations to economic size, so overall migration efficiency may decline.
* Areas of structural growth after charging can leak if the seal is fractured during deformation (see [[Leakage]]).
* Areas with hydrodynamic trapping may have problems with variable [[oil quality]] due to [http://www.oiltracers.com/services/exploration-geochemistry/oil-biodegradation.aspx biodegradation] (see [[Petroleum destruction]]).
==See also==
==See also==
* [[Hydrodynamics: change in configuration]]
* [[Hydrodynamics: change in configuration]]
* [[Postaccumulation cementation]]
* [[Postaccumulation cementation]]
==External links==
==External links==