Geoelectric/electromagnetic VLF survey for groundwater development in a basement terrain – a case study

Afolayan, JF; Olorunfemi, M. O.; Afolabi, Akinjide Moses

doi:10.4314/ijs.v6i1.32126

Cited by 16 publications

(11 citation statements)

References 2 publications

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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. The VES and the horizontal profiling techniques are 1D data gathering for measurement of variations in resistivity or electromagnetic response along vertical and horizontal directions respectively.…”

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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“…Among the various geophysical methods of groundwater investigation, the Electrical Resistivity Method has the widely applied for groundwater exploration [5] [6] [7] and [8]. This is due to the fact that the field operation is easy, the equipment is portable, less filled pressure is required, it has greater depth of penetration, and it is accessible to modern communication systems (i.e., computer).…”

Section: Methodsmentioning

confidence: 99%

Identification of Groundwater in Hard Rock Terrain Using 2D Electrical Resistivity Tomography Imaging Technique: Securing Water Scarcity at the Time of Seasonal Rainfall Failure, South Andaman

Sk¹,

Ramanujam²,

Champoil³

et al. 2018

IJG

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Like many of the tropical islands, the population of Andaman and Nicobar Islands, though not directly, relies predominantly upon rain water harvesting to quench their need and also depends on the groundwater sources. In the background of climate change, severity of hydrological cycle is much anticipated which may cause more extreme and unusual precipitation. It is quite essential to have other alternatives. Accordingly, groundwater could be exploited as a potential alternative. The present study intends to find out the potential groundwater source and estimate aquifer parameters in Kodiyaghat (KD) and Burmanallah (BN). As these areas are composed of very hard rock, Wenner-Schlumberger array has been used to carry out a 2D Electrical Resistivity Tomography survey to find out the fracture zone as well as to delineate the aquifer. KD and BN show maximum resistivity of 25,416 Ωm and 5985 Ωm indicate very hard rock terrain. Similarly, the minimum values of resistivity (21.6 Ωm and 30.4 Ωm) were observed at KD and BN define the presence of freshwater aquifers respectively. The aquifer identified was found to be at a depth of 5 m to 19.9 m at KD and 2.5 m to 20 m at BN. The calculated Hydraulic conductivity (14.85 m/day and 30.14 m/day), transmissivity (86.25 m 2 /day and 271.27 m 2 /day) and porosity (28.7% and 31.24%) values at KD and BN confirmed that, the located aquifer was of fresh ground water quality and can be utilized for drinking and house hold purposes. According to the results, almost 70% of the study area is hard rock terrain and 30% comes under potential aquifer zone. The results also show that, both the areas were characterized by Horst How to cite this paper: Sk, M., Ramanujam, N.,

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“…Many geophysical techniques have been used in groundwater exploration [5,6,7]; but the most widely used is the electrical resistivity method [8,9,10]. This is because less field manpower is required and the equipment is portable; hence the field operation is easy.…”

Section: Fig 2 Map Of Ikwuano-umuahia Area Showing the Study Areamentioning

confidence: 99%

Evaluation of Groundwater Potential Using Integrated Geophysical Data in Parts of Michael Okpara University of Agriculture, Umudike, Southern Nigeria

Amos-Uhegbu

Igboekwe

Eke

2017

AIR

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This study was carried out to investigate the groundwater potential in Michael Okpara University of Agriculture, Umudike area of Abia State, Nigeria. A total of nine vertical electrical soundings were acquired and the results were correlated with records available from an existing well together with previous lithologic deductions. A range of 4 to 6 geoelectric layers was delineated in this study; though the fourth and fifth geoelectric layers were predominant. Results showed that the aquifer is located within the third layers for the 4-layered zone and the fifth and sixth layers for the other layered zones. The depth to the shallowest aquifer is about 30m at VES 4 with the aquifer resistivity of 13124Ωm and transmissivity of 258.6 m 2 /d. The area has huge groundwater potentials with the best prospects at VES 2 and less promising results at VES 5.

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Geoelectric/electromagnetic VLF survey for groundwater development in a basement terrain – a case study

Cited by 16 publications

References 2 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

Identification of Groundwater in Hard Rock Terrain Using 2D Electrical Resistivity Tomography Imaging Technique: Securing Water Scarcity at the Time of Seasonal Rainfall Failure, South Andaman

Evaluation of Groundwater Potential Using Integrated Geophysical Data in Parts of Michael Okpara University of Agriculture, Umudike, Southern Nigeria

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