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A hydrocarbon reservoir has a distinctive shape, or configuration,
that prevents the escape of hydrocarbons that migrate into it.
Geologists classify reservoir shapes, or traps, into two
types; structural traps: a deformation in the rock layer
that contains the hydrocarbons. Examples; fault traps and anticlinal
traps. stratigraphic traps:form when other beds seal a
reservoir bed or when the permeability changes within the reservoir
bed itself. combination trap:this happens when more than
one kind of trap forms.
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