Trap spillage

Exploring for Oil and Gas Traps
Series	Treatise in Petroleum Geology
Part	Predicting the occurrence of oil and gas traps
Chapter	Predicting preservation and destruction of accumulations
Author	Alton A. Brown
Link	Web page
Store	AAPG Store

Spillage occurs in one of three ways:

• Changes in the trapping geometry
• Changes in the fluid contact due to hydrodynamics
• Reduction in reservoir volume due to postaccumulation cementation

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 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.

See also

• Changes in trapping geometry
• Changes in hydrodynamic configuration
• Postaccumulation cementation
• Consequences of spillage

External links

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