Changes

==Expulsion==

==Expulsion==

Hydrocarbon generation causes pressure build-up in the [[source rock]], exceeding the pore pressure of the adjacent aquifer. Oil or gas is expelled or “squeezed” into the aquifer due to the differential pressures between source rock and aquifer fluid.

Expulsion describes the movement of hydrocarbons from the petroleum source rock into the carrier bed or migration conduit.  The expulsion event is driven by a combination of factors that include compaction, chemical reactions, source richness, kerogen type, and thermal expansion.  Hydrocarbon generation causes pressure build-up in the [[source rock]], exceeding the pore pressure of the adjacent carrier bed. Oil or gas is expelled or “squeezed” into the carrier bed due to the differential pressures between source rock and fluid in the carrier bed.

==[[Migration]]==

==[[Migration]]==