What geological structural feature in the Niger Delta acts as the primary trapping mechanism for oil and natural gas accumulation?
Answer and explanation
Correct answer: A. rollover anticlines associated with growth faults
- Step 1: Gravitational instability of thick prograding sediments in the Cenozoic Niger Delta triggered syn-sedimentary listric normal faults (growth faults). Step 2. The downthrown sedimentary blocks rotate to produce rollover anticlines and fault-assisted closures that trap hydrocarbon fluids in Agbada sandstones. Answer: rollover anticlines associated with growth faults. Why not the others: The Niger Delta has no evaporite salt deposits; no impact craters are involved; the Gulf of Guinea is a passive margin, not a subduction trench.
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