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PETROLEUM SYSTEM: MIGRATION & ACCUMULATION Petroleum - Coggle Diagram
PETROLEUM SYSTEM: MIGRATION & ACCUMULATION 
Oil and gas migration
The migration of oil and gas happened in three stages which are the primary migration, secondary migration and tertiary migration
At primary migration, the hydrocarbon is being expulsion from the fine-grained source rocks to the coarse-grained reservoir rocks
At secondary migration, the hydrocarbon is moving from the fine-grained rock source to the coarse-grained rock source through porosity and permeable reservoir or trap the result of buoyant and hydrodynamic processes
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Migration is controlled by the physical properties of the sedimentary strata that the oil is moving through permeability and porosity driven by pressure
At tertiary migration is the movement of oil and gas after formation of recognizable accumulation. It include leakage, seepage, dissipation and alteration of petroleum as it reaches the earth's surface
Oil and gas accumulation
The oil and gas will accumulate at the source rock which it can penetrate and trap in a large area by the migration stages.
OIl is a liquid at STP and contains hydrocarbons with carbon numbers ranging from butane which is 4 to high,
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Hydrogen-rich kerogen yields abudant oil and gas while Hydrogen-poor kerogen yields less hydrocarbon
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