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Type of Petroleum Barrier, Characteristic of resevoir, Petroleum traps,…
Type of Petroleum Barrier
Trap
Structural Trap
Anticlinal Trap
Petroleum migrates into highest part of fold
escape prevented by overlying bed of impermeable rock
upward fold in layers of rock
formed because of deformation in rock layer contain HC
Fault Trap
Occur when formation either side of fault been moved
prevent further migration
prevent by impermeable layer
Drapes
Diaper-related traps produced by halokinesis
Faulting
Folding (anticlinal)
Stratigraphic Trap
reservoir bed is sealed by other bed
change in porosity or permeability within reservoir bed
Titled or inclined layer of petroleum-bearing rock
truncated by horizontal, impermeable rock layer
Unconfirmity
Reef
Pinchouts
Combination
Seal
Effectives
Evaporites
notably salt
anhydrite
Sealing Efficiency
Lateral extent and continuity
Permeability
Thickness
Presence or absence of faults and fractures
Common
Shale
impermeable barrier to prevents further flow
Characteristic of resevoir
Rock porosity
Pay Zone Thickness
Rock total compressibility
Rock permeability
Lithology
Petroleum traps
Contact of fluid is horizontal and flat, tilted cause by
Scope of trap
Tar formation at the bottom
Production
Facies change (grain size)
Hydrodynamic flow
Oil Water Contact (OWC): deepest oil can removed
contain oil, gas or both
GOC/GWC: lowest limit of gas production
Petroleum Alteration
due to biodegradation
Due to thermal alteration
leading to compositional changes in petroleum