Primary migration: process involved in movement of generated hydrocarbons from fine grained low permeiability source rock into highly permeable carrier beds.
Secondary migration: process involved in movement of hydrocarbons within permeable formations and fractures owing to pressure differences, buoyance, or diffusion.
Entrapment: Confinement of hydrocarbons at faults,formation boundaries or pinch-outs owing to capillary pressure greater than buoyant force
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