6. Results
The U1 unconformity depth map generated with an increment of
50 m illustrates a fault system with dominant NW–SE trend (N140 to
N160) where the major ones are located to the northeast (Fig. 10).
Two different domains have been identified in this map; a deep domain
D1 in the southwest with an exceeded depth of 3500 m affected by
small to moderate faults and a shallow domain D2 in the northeast
with depth range from 1500 to 2500 m. These two major domains
(D1 and D2) are generally extended along the NW–SE direction. The
U2 unconformity depthmap generatedwith an increment of 50 m, presents
the same described structures as in the previous U1 depth map
that is faults system with NW–SE direction (Fig. 11). However, the
two domains (D1 and D2) showslight change in the shape,with greater
extension demonstrated in the deeper domain and less extension in the
shallower one. The unconformity U3 depth map generated with an increment
of 25m, demonstrates amore significant change in comparison
to the previous U1 and U2 depthmaps (Fig. 12). The change is exemplified
by the total inversion of the sedimentary area from the southwest
to the northeast. The interpreted unconformity U3 is less faulted than
the previously described U1 and U2 surfaces, although the same NW–
SE fault system trend is still preserved. The tectonic and stratigraphic relationship of the Mesozoic and Cenozoic events is summarized in the
following 3D block diagram (Fig. 13) which clearly shows the preservation
of the extensional structures within the Cretaceous sequence. The
petroleum potential of the region is demonstrated by the number of
closed structures defined on these depth maps. Proven reservoirs
occur in the Upper JurassicM'Rabtine sandstoneMember belowunconformity
U1, the sandstones of Early Cretaceous Melloussi Formation for
the unconformity U2 and the carbonate of Upper Cretaceous Zebbag
Formation for the unconformity U1.
6. ResultsThe U1 unconformity depth map generated with an increment of50 m illustrates a fault system with dominant NW–SE trend (N140 toN160) where the major ones are located to the northeast (Fig. 10).Two different domains have been identified in this map; a deep domainD1 in the southwest with an exceeded depth of 3500 m affected bysmall to moderate faults and a shallow domain D2 in the northeastwith depth range from 1500 to 2500 m. These two major domains(D1 and D2) are generally extended along the NW–SE direction. TheU2 unconformity depthmap generatedwith an increment of 50 m, presentsthe same described structures as in the previous U1 depth mapthat is faults system with NW–SE direction (Fig. 11). However, thetwo domains (D1 and D2) showslight change in the shape,with greaterextension demonstrated in the deeper domain and less extension in theshallower one. The unconformity U3 depth map generated with an incrementof 25m, demonstrates amore significant change in comparisonto the previous U1 and U2 depthmaps (Fig. 12). The change is exemplifiedby the total inversion of the sedimentary area from the southwestto the northeast. The interpreted unconformity U3 is less faulted thanthe previously described U1 and U2 surfaces, although the same NW–SE fault system trend is still preserved. The tectonic and stratigraphic relationship of the Mesozoic and Cenozoic events is summarized in thefollowing 3D block diagram (Fig. 13) which clearly shows the preservationof the extensional structures within the Cretaceous sequence. Thepetroleum potential of the region is demonstrated by the number ofclosed structures defined on these depth maps. Proven reservoirsoccur in the Upper JurassicM'Rabtine sandstoneMember belowunconformityU1, the sandstones of Early Cretaceous Melloussi Formation forthe unconformity U2 and the carbonate of Upper Cretaceous ZebbagFormation for the unconformity U1.
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