Geoelectric characterization of Aquifer types in the basement complex terrain of parts of Osun state,Nigeria

Bayode, S.; Ojo, John Sunday; Olorunfemi, M. O.

doi:10.4314/gjpas.v12i3.16623

Cited by 8 publications

(7 citation statements)

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“…The electrical resistivity method involving 1D Vertical Electrical Sounding (VES) is commonly used to identify aquifers in basement complex environment (Ako and Olorunfemi, 1989;Olorunfemi and Okhue, 1992;Olayinka and Olorunfemi, 1992;Olorunfemi and Fasuyi, 1993;Ademilua and Olorunfemi, 2000;Bayode et al, 2006 andBayowa et al, 2014). At times, the VES techniques is preceded by horizontal profiling or electromagnetic profiling as a reconnaissance technique to map areas with thick weathered layer (overburden) and or discontinuities created by faults and fractured zones while the VES is adopted as a confir mator y technique (Olorunniwo and Olorunfemi, 1987;Hazell et al, 1988;Hazell et al, 1992;Olorunfemi et al, 1995;Afolayan et al, 2004;Oloruunfemi et al, 2005and Sharma and Baranwal, 2005and Okafor and Mamah, 2012.…”

Section: Integrated Geophysical Methods and Techniques For Siting Promentioning

confidence: 99%

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

Olorunfemi¹,

Oni²

2019

Ife Journal of Science

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Electrical resistivity survey involving 2D Dipole-Dipole subsurface imaging and 1D Vertical Electrical Sounding (VES) and an integrated magnetic and electrical resistivity survey involving magnetic profiling and 1D VES/2D electrical imaging techniques were carried out at two sites underlain by grey gneiss and pegmatised schist, respectively, within the Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria. The surveys were carried out with a view to delineating the subsurface layers and determining the geoelectrical characteristics; identify geological structures such as faults, fractured, jointed and sheared basement zones that are favourable to groundwater accumulation and transmission and estimate hydrogeologically significant borehole drill depth in an area with previous experience of failed borehole drilling attempts. At the two sites (A&B) investigated, the 2D resistivity images identified suspected fractured basement zones as low resistivity vertical discontinuities within high resistivity fresh basement host rock. The magnetic profiles at site B displayed typical magnetic anomaly of a thick dyke (two magnetic lows with central high in low magnetic latitude) over each vertical resistivity discontinuity. The follow-up VES delineated maximum of five subsurface layers which include the topsoil/laterite, weathered layer, partly weathered/fresh basement, fractured basement and the fresh basement. The weathered/fractured basement constitutes the main aquifer unit with thicknesses varying from 17.7-125 m. Two boreholes, one per site, were drilled to 80 m at site A and 70 m at site B. Both boreholes encountered the predicted fractured basement zones and the borehole logs correlated well with the interpretation models of the drilled VES locations. The boreholes were very productive (yields of about 1.5 l/s and 2.2 l/s at sites A & B respectively). The study demonstrated the effectiveness of integrated geophysical methods and techniques in providing information on the subsurface sequence and the structural disposition required for a successful groundwater development through borehole drilling, in a borehole-failure-prone basement complex terrain.

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Section: Integrated Geophysical Methods and Techniques For Siting Promentioning

confidence: 99%

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

Olorunfemi¹,

Oni²

2019

Ife Journal of Science

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“…This geological formation has been observed to be contributing to the nature and types of aquifers within the area. Hydrogeologically, the Basement Complex has been observed to made up of two major aquifer units (weathered and fractured Basement aquifers) (Afolayan et al, 2004 andBayode et al, 2006). Aquifers in the Basement Complex rocks are highly limited in both horizontal and vertical extent (Akintorinwa et al, 2020).…”

Section: Geology and Hydrogeology Of The Study Areamentioning

confidence: 99%

Groundwater Potential Modelling and Aquifer Zonation of a Typical Basement Complex Terrain: A Case Study

Ogundana

Falae

2023

Preprint

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Geophysical exploration using Vertical Electrical Resistivity (VES) techniques has been employed to study the groundwater potential and vulnerability of selected locations. The objective is to investigate nature and groundwater yielding potential of the area under investigation and to understand roles of various geophysical parameters in groundwater potential of the area and their effective characterisation of hydrogeological units. The juxtaposition of contour maps which show variations in hydrogeological parameters in a continuum manner is worthwhile. The results have really shown that the general trend of groundwater potential within the study area is low as indicated from the hydraulic conductivity, transmissivity and porosity. The generated groundwater potential map of the area can be used in designing appropriate groundwater exploration and management within the area and can serve as a roadmap for further expansion of the research work.

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“…Therefore, the study area can be said to be monolithic in nature, which is of same geology (Figure 2) and soil composition. In terms of hydrogeology, the Basement Complex area is mainly characterized by two major aquifer units, namely weathered and fractured Basement aquifers (Ako and Olorunfemi, 1989;Aniya and Shoeneick, 1992;Olorunfemi and Fasuyi, 1993;Afolayan et al, 2004 andBayode et al, 2006). The Basement Complex rocks are mostly concealed by a sequence of unconsolidated superficial deposits and Basement regolith produced by prolonged weathering of the parent rock.…”

Section: Geology and Hydrogeology Of The Study Areamentioning

confidence: 99%

Hydrogeophysical and aquifer vulnerability zonation of a typical basement complex terrain: A case study of Odode Idanre southwestern Nigeria

Akintorinwa

Atitebi

Akinlalu

2020

Heliyon

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An approach engaging Vertical Electrical Sounding (VES) and remote sensing data was carried out with a view to developing groundwater potential and aquifer vulnerability maps of the study area. One hundred and one (101) depth sounding data were acquired using Schlumberger array, with half maximum current electrode separation (AB/2) of 100 m. The VES were quantitatively interpreted using partial curve matching and computer aided iteration to determine the geoelectrical parameters of each station. The remote sensing data were processed using the application of Geographic Information System-based multi-criteria technique ArcGIS software. Eight (8) parameters namely lineament density, drainage density, slope, transmissivity, hydraulic conductivity, coefficient of anisotropy, aquifer thickness and resistivity were used to produce the groundwater potential model while five (5) parameters namely, lineament density, slope, longitudinal conductance, hydraulic conductivity and thickness of layer overlying the delineated aquifer were also used to produce the vulnerability model. The final output of overlay parameters for estimating the groundwater potential gave an index that ranged from 1-5. The zone categorised as low groundwater potential covered about 80% of the area. The majority of the area falls within low (about 80%) vulnerability and low groundwater potential rating while being relatively protected from potential contaminants infiltrating from the surface. The prediction accuracy of the groundwater potential model was established via existing hand-dug well correlation analysis.

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Geoelectric characterization of Aquifer types in the basement complex terrain of parts of Osun state,Nigeria

Cited by 8 publications

References 0 publications

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

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

Groundwater Potential Modelling and Aquifer Zonation of a Typical Basement Complex Terrain: A Case Study

Hydrogeophysical and aquifer vulnerability zonation of a typical basement complex terrain: A case study of Odode Idanre southwestern Nigeria

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