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  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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Continuous, separate-phase migration of hydrocarbons moves high volumes of hydrocarbons during primary, secondary, tertiary, and remigration. Several processes can occur during separate-phase migration: formation of small free hydrocarbon masses, slug flow, cosolution, and compositional changes due to phase changes.

Continuous, separate-phase migration of hydrocarbons moves high volumes of hydrocarbons during primary, secondary, [[Tertiary migration|tertiary]], and remigration. Several processes can occur during separate-phase migration: formation of small free hydrocarbon masses, slug flow, cosolution, and compositional changes due to phase changes.

==Small free hydrocarbon masses==

==Small free hydrocarbon masses==

==Slug flow in secondary, tertiary, and remigration==

==Slug flow in secondary, tertiary, and remigration==

Slug flow also dominates secondary, tertiary, and remigration. At each contact between a coarse pore network and a fine pore network, the mass of hydrocarbons accumulates until it reaches a buoyancy pressure great enough to overcome the capillary forces of the fine pore network. Relative [[permeability]] effects also aid migration. As hydrocarbons fill a pore network, the ability of a pore network to transport water decreases. This process builds pore pressure, helping push the hydrocarbons through the capillary restrictions.

Slug flow also dominates secondary, [[Tertiary migration|tertiary]], and remigration. At each contact between a coarse pore network and a fine pore network, the mass of hydrocarbons accumulates until it reaches a buoyancy pressure great enough to overcome the capillary forces of the fine pore network. Relative [[permeability]] effects also aid migration. As hydrocarbons fill a pore network, the ability of a pore network to transport water decreases. This process builds pore pressure, helping push the hydrocarbons through the capillary restrictions.

==Slug flow compositional changes==

==Slug flow compositional changes==