Geophysical investigations for groundwater in Precambrian terrains: a case history from Ikare, southwestern Nigeria

Olorunniwo, M.A.; Olorunfemi, M. O.

doi:10.1016/0899-5362(87)90035-2

Cited by 12 publications

(6 citation statements)

References 15 publications

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“…8). The area that has the thickest overburden is B3, which conforms to Olorunmiwo and Olorunfemi (1987); Aboh and Osazuwa (2000). They suggested that areas with highest ground water yield in basement terrain are found in area, where thick overburden overlies fractured Zones which are characterized by relatively low resistivity.…”

Section: Depth To Basement Mapsupporting

confidence: 69%

Geoelectric Investigation of the Subsurface Structures in Part of Gidan Kwano Campus of the Federal University of Technology, Minna, Nigeria

Shaibu¹,

Udensi

Chinwuko³

et al. 2017

IJSGS

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Geoelectric investigations of the subsurface structures of parts of the Gidan Kwano campus Federal University of Technology (F.U.T) Minna, Nigeria were carried out using vertical electrical soundings technique. The area lies within the Pre-Cambian Basement Complex of Northern Nigeria. This study was carried out with the aim of determining subsurface structures of the area for groundwater potentials and to possibly locate those areas that could be useful for civil engineering work at a very low risk. Thirty-six vertical electrical soundings along six profiles (A-F) were carried out during the geophysical survey. The survey was carried out on grid 500m x500m. The data obtained were interpreted using computer based program named Zohdy. The result of the interpreted vertical electrical soundings (VES) curves reveals three distinct geo-electric curves types were delineated: K, H and HK-curves with H-type having the most prolific aquifer. The result also shows 3 geo-electric layers which were confirm by borehole lithology. The aquifers in the study area are likely to be found in the fractured basement layers of eastern and southeastern parts of the study area. The civil engineering work can be sited in the northern and southwestern parts of the study area which are the region of shallow basement.

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Section: Depth To Basement Mapsupporting

confidence: 69%

Geoelectric Investigation of the Subsurface Structures in Part of Gidan Kwano Campus of the Federal University of Technology, Minna, Nigeria

Shaibu¹,

Udensi

Chinwuko³

et al. 2017

IJSGS

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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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“…Dalam ilmu kebumian, metode geofisika sudah banyak dimanfaatkan untuk mendeteksi keberadaan akuifer. Metode geofisika seperti Electrical Resistiity Imaging (ERI) [6,7,8], kombinasi metode Vertical Resistivity Sounding (VES) dan elektromagnetik (EM) [9], dan integrasi metode magnetik, very low frequency electromagnetic (VLF) and geolistrik resistivitas [10], telah berhasil diaplikasikan di berbagai belahan dunia. Selain mendapatkan hasil yang cepat, metode ini juga lebih murah dan mudah untuk diaplikasikan.…”

Section: Pendahuluanunclassified

Investigasi Air Tanah Pada Endapan Piroklastik dengan Menggunakan Metode Electrical Resistivity Imaging (ERI)

et al. 2020

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Penelitian untuk menginvestigasi keberadaan air tanah menggunakan metode Electrical Resistiity Imaging (ERI) dilakukan di kampus Institut Teknologi Sumatera (ITERA), Lampung Selatan yang daerahnya didominasi endapan piroklastik. Penelitian dilaksanakan di laboratorium untuk mengukur nilai resistivitas material secara langsung, dan juga dilakukan pengukuran data lapangan. Pengamatan laboratorium menunjukkan variasi nilai resistivitas untuk tuf pada kondisi kering berkisar 78.39 - 268.78 Ωm, dan nilai resistivitasnya menjadi 15.35 - 45.82 Ωm ketika tersaturasi, sedangkan nilai resistivitas untuk lempung tufan kering sebesar 93.36 - 292.48 Ωm dan pada saat tersaturasi air sebesar 4.56 - 13.47 Ωm. Pada data lapangan pada lapisan pertama yang didominasi tuf dengan nilai resistivitas sedang sampai tinggi karena materialnya kering, lapisan kedua dan keempat mempunyai resistivitas rendah karena tersaturasi oleh air, dan lapisan ketiga diinterpretasi sebagai lempung tufa dengan nilai resistivitas sedang hingga tinggi. Dari hasil mengindikasikan adanya akuifer pada kedalaman 0 – 30 m dan kedalaman di bawah 60 m.

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Geophysical investigations for groundwater in Precambrian terrains: a case history from Ikare, southwestern Nigeria

Cited by 12 publications

References 15 publications

Geoelectric Investigation of the Subsurface Structures in Part of Gidan Kwano Campus of the Federal University of Technology, Minna, Nigeria

Geoelectric Investigation of the Subsurface Structures in Part of Gidan Kwano Campus of the Federal University of Technology, Minna, Nigeria

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

Investigasi Air Tanah Pada Endapan Piroklastik dengan Menggunakan Metode Electrical Resistivity Imaging (ERI)

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