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.

The...

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