Extensional structures that include normal faults whose dip decreases
with depth are well known in the West African passive margin. The faults
detach on the Aptian-aged Loeme salt layer. Rotation and faulting of
the hanging-wall blocks has produced hydrocarbon trap geometries that
hold several billion barrels of reserves. Single listric fault systems,
including subsidiary faults, are responsible for most structures; however,
we have mapped a trend of structures formed by two generations of faulting
within the block 0 concession offshore Cabinda, Angola. The resulting
geometry of cross-cutting faults has introduced additional trap types
not recognized before in the region.