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  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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Although the presence of a petroleum phase may retard diagenesis in an accumulation, sooner or later [[reservoir quality]] decreases with increasing age and burial.<ref name=ch11r5>Bloch, S., 1991, [http://archives.datapages.com/data/bulletns/1990-91/data/pg/0075/0007/0000/1145.htm Empirical prediction of porosity and permeability in sandstones]: AAPG Bulletin, vol. 75, p. 1145–1160.</ref>

Although the presence of a petroleum phase may retard [[diagenesis]] in an accumulation, sooner or later [[reservoir quality]] decreases with increasing age and burial.<ref name=ch11r5>Bloch, S., 1991, [http://archives.datapages.com/data/bulletns/1990-91/data/pg/0075/0007/0000/1145.htm Empirical prediction of porosity and permeability in sandstones]: AAPG Bulletin, vol. 75, p. 1145–1160.</ref>

==The process==

==The process==

As the pore volume within a trap decreases due to burial cementation, several phenomena combine to destroy the economic accumulation.

As the pore volume within a trap decreases due to [[burial cementation]], several phenomena combine to destroy the economic accumulation.

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| Petroleum is displaced from the trap at the spill point as the pore volume within the structural closure decreases. If porosity is lowered sufficiently, the accumulation may be subeconomic in size.

| Petroleum is displaced from the [[trap]] at the spill point as the pore volume within the structural closure decreases. If porosity is lowered sufficiently, the accumulation may be subeconomic in size.

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