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International Journal Geology and Mining

The Lamja sandstone in Northeast Nigeria: Sedimentology and reservoir quality

Uzoegbu MU* and Uchebo UA

Accepted 20 May, 2014.

Citation: Uzoegbu MU, Uchebo UA (2014). The Lamja sandstone in Northeast Nigeria: Sedimentology and reservoir quality. International Journal Geology and Mining 1(1): 017-029.

Copyright: © 2014 Uzoegbu and Uchebo. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Abstract

The Lamja Sandstone conformably overlies the Numanha Shale. The exposures of the formation occur on the eastern and southern fringes of the Tertiary Lunguda Basalt Plateau. The Lamja Sandstone consists of shale, coal, siltstone, sandstone, sandy limsestone and carbonaceous sandstone. The dominant sedimentary structures are parallel lamination, cross bedding, cross lamination, cross stratification, planar bedding and bedding planes. Petrographic studies show that the sandstone is poorly-moderately sorted, very fine-fine grained and sub-angular-sub-rounded. Granolumetric data show a graphic mean size of 2.82ø (fine grained sandstone), mean standard deviation of 1.62 (poorly sorted) while the skewness values are positively fine skewed, and kurtosis; showing an average value of 0.860 (mesokurtic). Bivariate plots standard deviation versus skewness, standard deviation versus mean; and standard deviation versus first percentile for sample studied cluster within the river environment. The cumulative probability curves plotted, showed that most of the samples are characteristics of fluvial.

Keywords: Lamja sandstone, sedimentology, depositional environment, reservoir quality, poorly sorted.