scholarly journals Integrated geophysical methods and techniques for siting productive boreholes in basement complex terrain of southwestern Nigeria

2019 ◽  
Vol 21 (1) ◽  
pp. 13 ◽  
Author(s):  
M.O. Olorunfemi ◽  
A.G. Oni
Keyword(s):  
Complex Terrain ◽  
Geophysical Methods ◽  
Basement Complex ◽  
Southwestern Nigeria ◽  
Methods And Techniques

scholarly journals Soil corrosivity and aquifer protective capacity of overburden units in Ado-Ekiti, southwestern Nigeria

2018 ◽  
Vol 65 (1) ◽  
pp. 45-58
Author(s):  
A.A. Oyedele ◽  
G.M. Olayanju ◽  
A.O. Talabi ◽  
S.N. Ogunyebi ◽  
O.F. Ojo
Keyword(s):  
Complex Terrain ◽  
Physicochemical Analysis ◽  
Central Portion ◽  
Protective Capacity ◽  
Basement Complex ◽  
Southwestern Nigeria ◽  
Longitudinal Conductance ◽  
North Eastern ◽  
Electrical Sounding ◽  
Soil Corrosivity

AbstractVertical electrical sounding, well inventory and physicochemical analysis were conducted to evaluate soil corrosivity and aquifer protective capacity of overburden units in the basement complex terrain of Ado-Ekiti, southwestern Nigeria. The topsoil is composed of slightly corrosive materials at the eastern, southern and northeastern flanks and the central portion with resistivity values ranging from 60 to 180 Ωm. Moderately corrosive/slightly corrosive materials (with resistivity values of 10 < ρ < 60 Ωm) constitute the second layer around the eastern, southern and north-eastern flanks. Pockets of areas in the northwestern, southeastern, eastern and central parts of the metropolis are practically non-corrosive with resistivity values in excess of 200 Ωm. Zones of good, moderate, weak and poor overburden protective capacity were delineated, with longitudinal conductance (S) values of 0.7 < S < 4.9, 0.2 < S < 0.69, 0.1 < S < 0.19 and S < 0.1 mhos, respectively. On a regional consideration, 23.31%, 18.80% and 57.9% of the study area is characterised by overburden materials of poor, weak and moderate protective capacity, respectively. Only 6.02% of the area indicates good overburden protective capacity.

scholarly journals Application of geophysical approach to highway pavement failure: a case study from basement complex terrain southwestern Nigeria

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Charles I. Adenika ◽  
Emmanuel A. Ariyibi ◽  
Musa O. Awoyemi ◽  
Adebiyi S. Adebayo ◽  
Oluwaseyi A. Dasho ◽  
...  
Keyword(s):  
Complex Terrain ◽  
Basement Complex ◽  
Southwestern Nigeria ◽  
Highway Pavement

scholarly journals The Horizontal Loop Electromagnetic (HLEM) Response of Ifewara Transcurrent Fault,Southwestern Nigeria: A Computational Results

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
A. A. Adepelumi ◽  
O. B. Olayiwola ◽  
D. E. Falebita ◽  
D. E. Falebita ◽  
O. Afolabi ◽  
...  
Keyword(s):  
Complex Terrain ◽  
Mineral Exploration ◽  
Forward Modeling ◽  
Basement Complex ◽  
Forward Solution ◽  
Southwestern Nigeria ◽  
Geological Interpretation ◽  
Overburden Thickness ◽  
Dip Angle ◽  
Depth Of Burial

The need to accurately interpret geological models that approximate mineralized zones in a Basement Complex terrain necessitate the development of horizon loop electromagnetic method (HLEM) forward modeling solutions for such scenarios. The focus of the present work is on finding rapid forward modeling solutions for synthetic HLEM data as an aid in exploration for moderate to deep conductive mineral exploration targets.The main thrust is obtaining idealized HLEM models that are required for geological interpretation of the subsurface in such environment. The original HLEM equations developed by Wesley were extended to represent a horizontally stratified earth with a conductive approximated by shear zone. From these equations a computer program was written to calculate the HLEM responses for optimal conductor model with known values of coil separations (L), depth of burial (z) and angle of dip of the target.The thin conductive model was used because it is simple and suitable for different geological scenarios. The accuracy of the approximate forward solution has been confirmed for HLEM systems with various geometric ranges, frequencies and conductivities. Three models having varying overburden thickness, dip angle of target and source-receiver separation were used in the forward modeling. The effect of varying the dip angle,overburden thickness and coil separation was studied in all the three models used. The result obtained from the forward modeling showed that variation of the dip angle gave rise to changes in the amplitudes of the anomalies generated, while that of overburden and coil separation gave rise to changes in anomaly shape. Also, the geometry and position of the causative body were precisely delineated.

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