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Line 1: − By Mike Shepherd, [http://store.aapg.org/detail.aspx?id=788 AAPG Memoir 91, Oil Field Petroleum Geology] − − When hydrocarbons migrate into a trap, the buoyancy force exerted by the lighter oil (or gas) will push the water that was previously in the pore space sideways and downward. However, not all of the water is displaced; some of it will be held by capillary forces within the pores. Narrower capillaries, pores with smaller pore throats, hold onto water the strongest. Line 17:
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Buoyancy forces in reservoir fluids (view source)
Revision as of 18:31, 7 April 2014
, 18:31, 7 April 2014no edit summary
{{publication
{{publication
| isbn = 0891813721
| isbn = 0891813721
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By Mike Shepherd, [http://store.aapg.org/detail.aspx?id=788 AAPG Memoir 91, Oil Field Petroleum Geology]
When hydrocarbons migrate into a trap, the buoyancy force exerted by the lighter oil (or gas) will push the water that was previously in the pore space sideways and downward. However, not all of the water is displaced; some of it will be held by capillary forces within the pores. Narrower capillaries, pores with smaller pore throats, hold onto water the strongest.
The two forces acting on the fluids in the pore space are controlled by physical laws. The equation for the buoyancy pressure is given by
The two forces acting on the fluids in the pore space are controlled by physical laws. The equation for the buoyancy pressure is given by