Publisher: Bachudo Science Co. Ltd

Hydrocarbon Resource Potential of The Bornu Basin Northeastern Nigerian

H. Hamza, I. Hamidu
KEYWORDS: Bornu Basin; Fika Shale; Source rocks; Organic matter; Petroleum System

ABSTRACT:

The separation of Africa from South America was accompanied by rifting and sinistral strike-slip movements
that formed the Bornu Basin. The Bornu Basin form part of the West African Rift System. Geochemical analyse of
samples from the Fika Shale shows that eighty percent of the samples have TOC values >0.5 wt%. Plots on the
modified Van Krevelen diagram indicate organic matter that is predominantly Type III kerogen. A corresponding plot
on the HI–Tmax diagram indicates an entirely gas generative potential for the source rocks.
In the Bornu Basin which belongs to the West African Rift Subsystem (WARS) two potential petroleum systems are
suggested. “Lower Cretaceous Petroleum System” – is the phase 1 synrift sediments made up of sandstones with an
extensive system of lacustrine deposits developed during Barremian to Albian time. “Upper Cretaceous Petroleum
System” – is the phase II rift sediments in the Bornu Basin which comprise mainly shallow marine to paralic shales,
deltaic to tidal flat sandstones and minor carbonates. TOC values range generally from 0.23 wt. % to 1.13 wt. % with
an average of 0.74 wt. % for the Fika Shale



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