Which three stratigraphic formations comprise the tertiary Cenozoic subsurface succession of the petroleum-bearing Niger Delta basin?
Answer and explanation
Correct answer: B. the Akata, Agbada, and Benin formations
- Step 1: The subsurface Niger Delta comprises three diachronous units from oldest to youngest: Akata (marine shales source rock), Agbada (interbedded sandstones and shales reservoir), and Benin (massive coastal sands). Step 2. Virtually all hydrocarbons produced in Nigeria are trapped within sandstone reservoirs of the Agbada Formation. Answer: the Akata, Agbada, and Benin formations. Why not the others: Asu River group belongs to the Benue Trough; Bima/Yolde belong to Upper Benue; Gwandu/Kalambaina belong to the Sokoto Basin.
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