Troduced for the Niger delta subsurface, comprising an upper sandy Benin Formation, an intervening by the Geological Survey of Nigeria, in the form of l:2S0. Geologic Framework. Regional Tectonic Setting. The Niger Delta basin is located at the southernmost extremity of the elongated intracontinental Benue. It is composed of several different geologic formations that indicate how this basin could have formed, as well as the regional and large scale tectonics of the area. The Niger Delta Basin is an extensional basin surrounded by many other basins in the area that all formed from similar processes.‎Basin formation · ‎Lithology · ‎Tectonic structures.


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It is composed of thick shales, turbidite sands, and small amounts of silt and clay. It is the mobile formation that is squeezed into shale diapirs in the basin that are formed form being over pressured and not being dehydrated properly.

The Akata Formation formed niger delta geology lowstands in sealevel and in oxygen deficient conditions. This formation is estimated to be up to meters thick. It niger delta geology a marine facies defined by both freshwater and deep sea characteristics.

PD 4(1) Petroleum Geology of the Niger Delta - OnePetro

This is the major oil and natural gas bearing niger delta geology in the basin. The hydrocarbons in this layer formed when this layer of rock became subaerial and was covered in a swamp type of environment that contained niger delta geology of organics. It is estimated to be meters thick. It is composed of continental flood plain sands and alluvial deposits.

Niger Delta Basin (geology)

It is estimated to be up to meters thick. The tectonic structures in the Niger Delta Basin are very typical of an extensional rift system, but the added shale diapirism due to compression makes this basin niger delta geology.

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The main method of deformation is due to gravitational collapse of the basin, although the niger delta geology faulting and deformation in the basin are related to the continental breakup and rifting of the African plate and South American plates. There is an extensional zone, which lies on the continental shelf, that is caused by the thickened crust.


The compression is caused by the toe detachment of the shale diapirs. Basin inversion forms anticline structures, which serve as a great oil trap. Clay smears in the sediments seal the formations so oil does not escape out. As fault blocks extend they rotate to dip towards the center of the basin.

niger delta geology

Niger Delta Basin (geology) - Wikipedia

At the top of these fault blocks sub basins can form. Shale diapirs The shale diapirs are from the Akata Formation. This structure is formed due to the improper dehydration of the formation and the over pressuring by the niger delta geology and denser Agbada Formation.

It niger delta geology considered a growth fault and the feature lies closer towards the basins edge and transitions to the toe detachment faulting as you continue down the basin.

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The entire system is predicted to contain This area is still very heavily explored by oil companies today. Ejedawe and others use maturation models to conclude that both Akata and Agbada shales source the oil. Doust and Omatsola conclude that the source organic matter is in the deltaic off lap sequences and in the sediments of the niger delta geology coastal plain and their hypothesis implies that both niger delta geology Agbada and Akata Formations likely have disseminated source rock levels.

The Benin Formation is absent in this belt Maloney et. The Akata Formation and the shaly intercalations of the Agbada Formation are believed to be the source rocks of the Niger Delta niger delta geology the paralic Agbada Formation constitutes the reservoir rock.

Sands in the Agbada formation are known to be the major reservoir rocks in the area. The research work aimed at employing geophysical approach to carry out a study on the shale lithologies of the Agbada Formation in the Niger Delta basin to prove whether they have mature source rock potential or their major responsibility is to seal the reservoirs, which has been the major argument among researchers.

Overlay of sonic niger delta geology and resistivity log was used to identify Kerogen rich zones, and overlay of sonic log and derived pseudo-sonic log derived from the cross-plot LogR and sonic log was used to test for maturity of the potential source rock zones, Seismic attribute RMS Amplitude was used to check for generated hydrocarbon in the shales as part of the property of mature source rock is to contain hydrocarbon about to be migrated.

Four major shales were studied and their petro physical analysis revealed niger delta geology two of the shales were Kerogen-rich source rocks, while the others were kerogen-defficient, Attribute analysis showed the absence of generated hydrocarbon.


The sonic-pseudo sonic overlay and attribute analysis revealed that none of the niger delta geology shales is a matured source rock. This work has been able to prove that Agbada shales are not matured source rocks, but rather sealing the reservoir.