Akata Formation



Akata is from Akata Formation which is a primary source rock for the Niger Delta, the most prolific petroleum system in Africa.

The Akata Formation is part of the Tertiary Niger Delta (Akata-Agbada) petroleum system located in the Niger Delta Province.

The upper Akata Formation is cited to be a primary source rock and a potential target in deep water offshore and possibly beneath currently producing intervals onshore.

In petroleum geology, source rock refers to rocks from which hydrocarbons have been generated or are capable of being generated. They form one of the necessary elements of a working hydrocarbon system. They are organic rich sediments that may have been deposited in a variety of environments including deep water marine, lacustrine and deltaic.

The Niger Delta formed at the site of a rift triple junction related to the opening of the southern Atlantic starting in the Late Jurassic and continuing into the Cretaceous. The delta proper began developing in the Eocene, accumulating sediments that now are over 10 kilometres thick.

The primary source rock is the upper Akata Formation, the marine-shale facies of the delta, with possibly contribution from interbedded marine shale of the lowermost Agbada Formation.

Stacher (1995) proposes that the Akata Formation is the only source rock volumetrically significant and whose depth of burial is consistent with the depth of the oil window. Ejedawe and others (1984) use maturation models to conclude that both Akata and Agbada shales source the oil. Doust and Omatsola (1990) conclude that the source organic matter is in the deltaic offlap sequences and in the sediments of the lower coastal plain and their hypothesis implies that both the Agbada and Akata Formations likely have disseminated source rock levels.