Minimizing Ambiguity Using Geo-electrical Investigations: Implications for Understanding the Hydro-geologic Setting of a Complex Sub-surface Geology in Oderigha and Environs, Southeastern Nigeria

  • Odong, Peter O niversity of Calabar
  • Agabi, David B Micheal Okpara University of Agriculture
  • Udo, Aniedi A Micheal Okpara University
  • Dinneya, Obinna C Micheal Okpara University
DOI: https://doi.org/10.53555/as.v2i8.1186
Keywords: Aquifer units, hydro-geologic, aquifer resistivity, geo-electric layer, sub-surface, water table, transmissivity.

Abstract

Geo-electric investigations using the schlumberger array was carried out in order to understand the hydrogeologic
setting in Oderigha and environs. Soundings were made in 18 different locations in the study area to
obtain depth to aquifer units, and thickness of aquifer units. The simulated results from the VES points reveal
the presence of 4-5 geo-electric layers. The top layer comprises clay, sand, siltstone intercalations. Layers
underneath the top soil are the silty shale, shale, water saturated shaly sandstone and sandstone aquifer. The
area is also characterized with high depth to sandstone aquifer which varies from 100m to 240m. The aquifer is
overlain by a massive embedded shale conductive layer. At the extreme of North Eastern part of the study area,
depths to aquifer are at about 3m to 40m, with VES location 15 having a thickness of about 17m. Aquifer
thickness in the study area varies from 17m to 120m. Cross sectional analyses of AA1
, BB1and CC1
in the study
area reveals that, VES no. 2, 14, 9, 18 and 11 will be the best locations to drill boreholes for sustainable
groundwater development in the area of study to serve the communities. It is also observed that this VES points
are located close to the communities. Aquifer resistivity value along the cross sections varies from 689Ωm to
66.94Ωm. The transmissivity varies between 3.5x10-2m2
/s to 4.68x100m2
/s, above the aquifer units in the study
area is a widely distributed thick saturated shaly conductive layer. Borehole construction in the area must be
preceded by a detailed geophysical survey with current electrode spacing of at least 600m and above.

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Author Biographies

Odong, Peter O, niversity of Calabar

Department of Physics, University of Calabar, P.M.B 1115 Calabar, Nigeria
[Corresponding Author]

Agabi, David B, Micheal Okpara University of Agriculture

Department of Physics, Micheal Okpara University of Agriculture, Umudike, Nigeria

Udo, Aniedi A, Micheal Okpara University

Department of Physics, Micheal Okpara University of Agriculture, Umudike, Nigeria

Dinneya, Obinna C, Micheal Okpara University

Department of Physics, Micheal Okpara University of Agriculture, Umudike,
Nigeria

Published
2016-08-31
How to Cite
Peter O, O., David B, A., Aniedi A, U., & Obinna C, D. (2016). Minimizing Ambiguity Using Geo-electrical Investigations: Implications for Understanding the Hydro-geologic Setting of a Complex Sub-surface Geology in Oderigha and Environs, Southeastern Nigeria. IJRDO-Journal of Applied Science, 2(8), 01-11. https://doi.org/10.53555/as.v2i8.1186
Issue
Vol. 2 No. 8 (2016): IJRDO - Journal of Applied Science
Section
Articles

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