Aquifer types and the geoelectric/hydrogeologic characteristics of part of the central basement terrain of Nigeria (Niger State)

Olorunfemi, M. O.; Fasuyi, S.A.

doi:10.1016/0899-5362(93)90051-q

Cited by 145 publications

(94 citation statements)

References 5 publications

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“…In areas underlain by crystalline rocks, groundwater occurs in fracture zone or in highly weathered basement (Olorunfemi and Fasuyi 1993;Ariyo et al 2003). The electromagnetic and resistivity methods are both responsive to water bearing basement fracture columns due to the relatively high bulk electric conductivities, both methods were, therefore, found relevant and were hence integrated in the geophysical investigation.…”

Section: Introductionmentioning

confidence: 99%

Geophysical evaluation of groundwater potential in part of southwestern Basement Complex terrain of Nigeria

et al. 2017

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The geophysical assessment of groundwater in Awa-Ilaporu, near Ago Iwoye southwestern Nigeria was carried out with the aim of delineating probable areas of high groundwater potential. The area falls within the Crystalline Basement Complex of southwestern Nigeria which is predominantly underlain by banded gneiss, granite gneiss and pegmatite. The geophysical investigation involves the very low frequency electromagnetic (VLF-EM) and Vertical Electrical Sounding (VES) methods. The VLF-EM survey was at 10 m interval along eight traverses ranging between 290 and 700 m in length using ABEM WADI VLF-EM unit. The VLF-EM survey was used to delineate areas with conductive/fractured zones. Twenty-three VES surveys were carried out with the use of Campus Ohmega resistivity meter at different location and at locations areas delineated as high conductive areas by VLF-EM survey. The result of VLF-EM survey along its traverse was used in delineating high conductive/fractured zones, it is, however, in agreement with the delineation of the VES survey. The VES results showed 3-4 geoelectric layers inferred as sandy topsoil, sandy clay, clayey and fractured/fresh basement. The combination of these two methods, therefore, helped in resolving the prospecting location for the groundwater yield in the study area.

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Section: Introductionmentioning

confidence: 99%

Geophysical evaluation of groundwater potential in part of southwestern Basement Complex terrain of Nigeria

et al. 2017

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“…The focus of this research is to delineate water bearing unit and determine its vulnerability potential to contamination or pollution, using integrated geophysical methods (electrical resistivity and very low frequency electromagnetic), borehole logging, and hydrogeological measurement. These methods have provedtheir effectiveness over the years in groundwater investigation [2][3][4][5][6][7].The concept of aquifer vulnerability derives from the assumption that the physical geomaterials may provide some level of protection to groundwater, especially with regard to pollutants entering the subsurface [8][9]. Consequently, the lithologic variations and the thickness of the unsaturated zone (vadose zone) which determines the inaccessibility of the underlying aquifer units [10], constitute the focus in aquifer vulnerability assessment.…”

Section: Introductionmentioning

confidence: 99%

Groundwater Potential and Vulnerability Assessment from Integrated Geophysical Methods, Borehole Logging, and Hydrogeological Measurement

2017

IJASRE

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“…The electrical resistivity method involving the Vertical Electrical Sounding (VES) technique is extensively used for environmental, groundwater, and engineering geophysical investigations (Zohdy, et al, 1980;Aina, et al, 1996;Olorunfemi, et al, 1993Olorunfemi, et al, & 2004and Afolabi and Olorunfemi, 2004). The success of this technique in the aforementioned depends on the accuracy of the interpretation results of the VES curves in terms of the layer resistivities and thicknesses.…”

Section: Introductionmentioning

confidence: 99%

Computer model study of the effect of resistive topsoil on interpretation results of subsurface geoelectric layers' parameters

Adeniran¹,

Olorunfemi²,

Bayowa³

2009

Glo Jnl Geo Sci

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This paper investigates the effect of resistive topsoil (upper layer) on interpreted subsurface layers' geoelectric parameters. Five hypothetical computer geoelectric models were employed for this study. Model A is a three-layered model with constant thicknesses and varied topsoil resistivity of 100 ohm-m to 2500 ohm-m. Model B is a threelayered model with constant resistivities and varied topsoil thicknesses from 2 to 12 m. Model C is a four-layered model with constant thicknesses and varied topsoil resistivities from 250 to 2500 ohm-m. Model D is a four-layered model with constant thicknesses and varied second layer resistivities from 1000 to 10000 ohm-m. Model E is a four-layered model with constant resistivities and varied second layer thicknesses from 2.0 to 20.0 m.A total of forty theoretical Vertical Electrical Sounding (VES) curves of the A, H, HA, and KHtype were generated and interpreted using the conventional partial curve matching method and computer assisted 1-D iterative forward modeling with the RESIST 1.0 (Vander-Velpen, 1988) software. Statistical analysis of percentage deviations between model and final interpretation parameters was carried out.Results obtained from Model A show insignificant overestimated and underestimated second layer geoelectric parameters. Results obtained from Model B show significant overestimated second layer geoelectric parameters -10.7% to 187.5% and 13% to 204% for percentage resistivity and thickness deviation respectively. Results obtained from Model C show highly overestimated second layer thicknesses and third layer resistivities -124% to 238% second layer percentage thickness deviation and 96% to 334.7% third layer percentage resistivity deviation. Results obtained from Model D showed highly overestimated third layer geoelectric parameters -66.30% to 300.4% and 68% to 316% for percentage resistivity and thickness deviation respectively. Results obtained from Model E show extremely overestimated third layer geoelectric parameters -183% to 800.7% and 182% to 876% for percentage resistivity and thickness deviation respectively.The study concludes that the VES technique can yield abnormally high layer parameters for subsurface layers overlain by a resistive topsoil or near surface layer.

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Aquifer types and the geoelectric/hydrogeologic characteristics of part of the central basement terrain of Nigeria (Niger State)

Cited by 145 publications

References 5 publications

Geophysical evaluation of groundwater potential in part of southwestern Basement Complex terrain of Nigeria

Geophysical evaluation of groundwater potential in part of southwestern Basement Complex terrain of Nigeria

Groundwater Potential and Vulnerability Assessment from Integrated Geophysical Methods, Borehole Logging, and Hydrogeological Measurement

Computer model study of the effect of resistive topsoil on interpretation results of subsurface geoelectric layers' parameters

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