SEDIMENTOLOGY OF EOCENE SANDSTONES AT OGBUNIKE AREA, SOUTHERN NIGERIA: INSIGHTS FROM PETROGRAPHIC AND GRANULOMETRIC ANALYSES

E. Faseki Oluyemi (), A. Olatinpo Olusegun, B. Omoyajowo Thomas, O. Ale Temitayo and O. Olomo Kazeem
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E. Faseki Oluyemi: Department of Earth Sciences, Adekunle Ajasin University, Akungba Akoko, Ondo State, Nigeria
A. Olatinpo Olusegun: Former Postgraduate Student, University of Ilorin, Ilorin, Kwara State, Nigeria
B. Omoyajowo Thomas: Department of Geology, Federal University, Oye Ekiti, Ekiti State, Nigeria
O. Ale Temitayo: Department of Earth Sciences, Adekunle Ajasin University, Akungba Akoko, Ondo State, Nigeria
O. Olomo Kazeem: Department of Earth Sciences, Adekunle Ajasin University, Akungba Akoko, Ondo State, Nigeria

Earth Sciences Malaysia (ESMY), 2022, vol. 6, issue 2, 103-111

Abstract: The sedimentary facies exposed at Ogbunike Area belong to the Eocene Formation that made up the Anambra Basin. This research estimates the lithology, thickness, sedimentary succession, paleo-environment, reservoir quality and source area tectonics using geological mapping, petrography, grain size distribution and statistical analysis. Geological mapping shows that the section is approximately 27m thick and consists of sandstone, shale, siltstone and ironstone lithofacies. Granulometric analysis performed on selected samples shows that the sandstones are fine to medium grained (1.15 to 2.17 ϕ), moderately sorted (average 0.96 ϕ), fine skewed (average 0.16 ϕ) and leptokurtic (average 1.17 ϕ). Bivariate plot of skeweness against sorting and mean against sorting pinpoint a fluvial origin for the sandstones. The results from rose plot point to a bimodal-bipolar paleocurrent pattern while the bi-directional paleo-flow is in the northeastern-southwestern directions, which is an indication of tidal influence suggesting shore environment of deposition. Average permeability values derived from an empirical formula indicate good potential for reservoir rock. Deductions from field observations and petrographic analysis suggests that the sandstones are submature, with angular to sub-rounded quartz. The high percentage of goethite (average 30.4%) in the ferrugenized sandstones samples suggests an environment of low oxidation. Provenance and tectonic assessment reveal metamorphic source, humid climate, high relief, recycled orogeny, and derived primarily from Cameroon Basement Complex rocks.

Keywords: Sandstone; Ameki Formation; Ogbunike; Provenance; Permeability; Tectonic (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:zib:zbesmy:v:6:y:2022:i:2:p:103-111

DOI: 10.26480/esmy.02.2022.103.111

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