The use of geological-based geophysical surveys for groundwater distribution in crystalline basement terrain, SW Nigeria

2nd International Conference on Science and Sustainable Development "The Role of Science in Novel Research and Advances in Technology"

自然科学;经济学

Oyeyemi, K.D.^1 ; Aizebeokhai, A.P.^1 ; Sanuade, O.A.^2 ; Ndambuki, J.M.^3 ; Olofinnade, O.M.^4 ; Olaojo, A.A.^5 ; Adagunodo, T.A.^1

Applied Geophysics Unit, Department of Physics, Covenant University, Nigeria^1

Department of Geoscience, King Fahd University of Petroleum and Minerals, Saudi Arabia^2

Department of Civil Engineering, Tshwane University of Technology, Pretoria, South Africa^3

Department of Civil Engineering, Covenant University, Nigeria^4

Department of Earth Sciences, Ajayi Crowther University, Nigeria^5

关键词: Basement aquifer;    Basement terrain;    Geoelectrical;    Groundwater exploration;    Subsurface characterizations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/173/1/012029/pdf
DOI  :  10.1088/1755-1315/173/1/012029

学科分类：自然科学（综合）

来源: IOP

【 摘 要 】

This research involves the subsurface geological characterization for groundwater potential assessment within the campus of the Polytechnic of Ibadan, southwestern Nigeria. The study is directed towards groundwater resources exploration, development and management in the campus. Five 2D resistivity imaging traverses were conducted using Wenner array in addition to five VES surveys using Schlumberger array that provide layering information and geoelectrical parameters. Three geologic layers delineated from the 2D resistivity inversion models include predominantly clayey sand/sandy clay top soil (overburden), partly weathered or fractured basement and fresh basement. Their inverse model resistivity values ranges 6.68 - 98.6 Ωm, 68.0 - 929 Ωm and ≥ 2252 Ωm with bottom depths ranges 3.8 - 6.4 m and 6.4 - 10 m respectively. 1D model inversion from VES results also delineate three lithologies classifying both topsoil and some part of the partly weathered basement as overburden with resistivity and thickness range 483 - 1746.9 Ωm, 1.1 - 1.8 m; partly weathered or fractured basement 60.3 - 93.5 Ωm, 8.4 -12.9 m and fresh basement 984.6 - 2078.9 Ωm . The saturated portion of the partly weathered or fractured basement at depth will favour groundwater exploration and development in this area, while the relatively shallow overburden thickness would serve as the protective layer and recharge for the fractures.