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Line 24: − − [[file:predicting-preservation-and-destruction-of-accumulations_fig11-2.png|thumb|{{figure number|2}}See text for explanation.]] + + +
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==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==
[[file:predicting-preservation-and-destruction-of-accumulations_fig11-2.png|thumb|{{figure number|2}}See text for explanation.]]
Traps in which faults form part of the closure are especially susceptible to spillage during structural growth because movement on the fault may result in leakage. Movement on the fault is also likely to juxtapose permeable lithologies across the fault at some point in the movement. [[:file:predicting-preservation-and-destruction-of-accumulations_fig11-2.png|Figure 2]] shows spillage resulting from movement on a sealing fault.
Traps in which faults form part of the closure are especially susceptible to spillage during structural growth because movement on the fault may result in leakage. Movement on the fault is also likely to juxtapose permeable lithologies across the fault at some point in the movement. [[:file:predicting-preservation-and-destruction-of-accumulations_fig11-2.png|Figure 2]] shows spillage resulting from movement on a sealing fault.