Changes

[[File:Drive-mechanisms-and-recovery_fig4.png|thumb|left|'''Figure 7.''' Fault plane section and structure map of a model field to show the effects of synclinal and cross fault spilling. (a) simple anticlinal closure cut by an extensional fault with two stacked reservoirs on both the downthrown and upthrown sides. Positions of cross fault spill points and synclinal spill points shown. (b) fault plane section illustrating the synclinal and cross fault spill points. Reservoir beds are shown hatchured, whereas seal horizons are shown white. Note the effect of thick seal trapping across the fault. (From Allan, 1989.)]]

[[File:Drive-mechanisms-and-recovery_fig4.png|thumb|left|'''Figure 7.''' Fault plane section and structure map of a model field to show the effects of synclinal and cross fault spilling. (a) simple anticlinal closure cut by an extensional fault with two stacked reservoirs on both the downthrown and upthrown sides. Positions of cross fault spill points and synclinal spill points shown. (b) fault plane section illustrating the synclinal and cross fault spill points. Reservoir beds are shown hatchured, whereas seal horizons are shown white. Note the effect of thick seal trapping across the fault. (From Allan, 1989.)]]

Bed contours and fault contours have to be combined in a series of overlays to generate the structure map. Initially, individual fault blocks bounded on all sides by faults have to be contoured separately.<ref name=Dickinson_1954>Dickinson, G., 1954, Subsurface interpretation of intersecting faults and their effect upon stratigraphic horizons. AAPG Bulletin, v. 38, n. 5, p. 854-877.</ref> <ref name=Brown_1986></ref>. The intersections between the bed and the fault contours of equivalent elevation value have to be identified to define the line of intersection of the bed and the fault. These lines are the fault cutoffs of the beds. There are two on each fault, one in the hanging wall and the other in the footwall. For extensional faults, there is a gap between the cutoffs where the key reference bed is omitted, and the gap in map view defines the heave across the fault.

Bed contours and fault contours have to be combined in a series of overlays to generate the structure map. Initially, individual fault blocks bounded on all sides by faults have to be contoured separately.<ref name=Dickinson_1954>Dickinson, G., 1954, Subsurface interpretation of intersecting faults and their effect upon stratigraphic horizons. AAPG Bulletin, v. 38, n. 5, p. 854-877.</ref> <ref name=Brown_1986></ref> The intersections between the bed and the fault contours of equivalent elevation value have to be identified to define the line of intersection of the bed and the fault. These lines are the fault cutoffs of the beds. There are two on each fault, one in the hanging wall and the other in the footwall. For extensional faults, there is a gap between the cutoffs where the key reference bed is omitted, and the gap in map view defines the heave across the fault.

===Map restorations===

===Map restorations===