Changes

  | part    = Predicting the occurrence of oil and gas traps

  | part    = Predicting the occurrence of oil and gas traps

  | chapter = Predicting preservation and destruction of accumulations

  | chapter = Predicting preservation and destruction of accumulations

  | frompg  = 11-1

  | frompg  = 11-7

  | topg    = 11-30

  | topg    = 11-8

  | author  = Alton A. Brown

  | author  = Alton A. Brown

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch11/ch11.htm

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch11/ch11.htm

Traps charged during structural growth are not destroyed by spillage as long as the trapping geometry is maintained during deformation because petroleum migrates with the structural closure much faster than the rate of structural growth.<ref name=ch11r15>Hubbert, M., K., 1953, [http://archives.datapages.com/data/bulletns/1953-56/data/pg/0037/0008/1950/1954.htm Entrapment of petroleum under hydrodynamic conditions]: AAPG Bulletin, vol. 37, p. 1954–2026.</ref> Conversely, if structural closure is destroyed during deformation, spillage occurs rapidly.

Traps charged during structural growth are not destroyed by spillage as long as the trapping geometry is maintained during deformation because petroleum migrates with the structural closure much faster than the rate of structural growth.<ref name=ch11r15>Hubbert, M., K., 1953, [http://archives.datapages.com/data/bulletns/1953-56/data/pg/0037/0008/1950/1954.htm Entrapment of petroleum under hydrodynamic conditions]: AAPG Bulletin, vol. 37, p. 1954–2026.</ref> Conversely, if structural closure is destroyed during deformation, spillage occurs rapidly.

Paleofluid contacts may be tilted where spillage results from structural tilting. For example, Prudhoe Bay field, charged during the Late Cretaceous and tilted during the late Eocene<ref name=ch11r1>Atkinson, C., McGowen, J., Block, S., Lundell, L., Trumbly, P., 1990, Braidplain and deltaic reservoirs, Prudhoe Bay field, Alaska, in Barwis, J., McPherson, J., Studlick, J., eds., Sandstone Petroleum Reservoirs: New York, Springer-Verlag, p. 7–30.</ref> resulted in a tilted paleo [http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=oil-water%20contact oil-water contact].

Paleofluid contacts may be tilted where spillage results from structural tilting. For example, [[Prudhoe Bay field]], charged during the Late Cretaceous and tilted during the late Eocene<ref name=ch11r1>Atkinson, C., McGowen, J., Block, S., Lundell, L., Trumbly, P., 1990, Braidplain and deltaic reservoirs, Prudhoe Bay field, Alaska, in Barwis, J., McPherson, J., Studlick, J., eds., Sandstone Petroleum Reservoirs: New York, Springer-Verlag, p. 7–30.</ref> resulted in a tilted paleo [http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=oil-water%20contact oil-water contact].

==Change in a fold trap==

==Change in a fold trap==

[[:file:predicting-preservation-and-destruction-of-accumulations_fig11-1.png|Figure 1]] shows how continued growth of a foreland-sloping duplex preserves an accumulation in an early duplex but displaces the accumulation relative to the reservoir rock. The stippled area outlining the initial accumulation is fixed relative to the rock. The solid area on the lower figure marks the accumulation at the top of the structure after movement.

[[:file:predicting-preservation-and-destruction-of-accumulations_fig11-1.png|Figure 1]] shows how continued growth of a foreland-sloping duplex preserves an accumulation in an early duplex but displaces the accumulation relative to the reservoir rock. The stippled area outlining the initial accumulation is fixed relative to the rock. The solid area on the lower figure marks the accumulation at the top of the structure after movement.

Similarly, where the axis of a fault-bend fold on a hanging wall is fixed relative to the bend of the fault on the foot wall, the actual rock occupying the fold changes during movement along the fault. However, the position of the trap remains approximately fixed relative to the footwall and the fault bend.

Similarly, where the axis of a fault-bend [[fold]] on a hanging wall is fixed relative to the bend of the fault on the foot wall, the actual rock occupying the fold changes during movement along the fault. However, the position of the trap remains approximately fixed relative to the footwall and the fault bend.

==Change in a fault trap==

==Change in a fault trap==

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Predicting preservation and destruction of accumulations]]

[[Category:Predicting preservation and destruction of accumulations]]