Abstract
Correlation of the schlumberger array geoelectric logs interpreted from Vertical Electrical Sounding (VES) data acquired in Ekiti State University Campus with borehole litholigic logs from the same area was done with the aim of establishing a mathematical relationship between the two logs. The study area is located within the basement complex of southwestern Nigeria, where occurrence of groundwater is limited to specific localized and enclosed regions within the weathered or fractured zones. Therefore, thorough geophysical surveys before drilling become necessary. The availability of borehole data in this area reduces the risk of data interpretation errors and enables prediction through statistical analysis. The Vertical Electrical Sounding data acquired from five stations within the campus were processed and interpreted using WINRESIST interpretation software. The results from the 2-D interpretation of the VES data were used to prepare five geoelectric sections which were compared with the borehole litholigic logs obtained from the same VES points using regression analysis. Depth to bedrock from Geoelectric log was correlated with the depth to bedrock from Lithologic log. The correlation coefficient gave a positive value of 0.9, which indicated a high degree of correlation between the geoelectric log and the borehole logs. The regression analysis equation obtained was y = 1.14x + 2.48. The equation is useful in converting the geoelectric logs to drilling logs in any location within the study area.
References
Abubakar, Y. I and Auwal, L. Y., (2012): Geoelectrical Investigation of Groundwater Potential of Dawakin Tofa Local Government Area of Kano State Nigeria.American International Journal of Contemporary Research 2(9): 188-197
Ademilua, O. L., Ojo, O. F., Bayowa, O. G., Ademilua, B. O. and Talabi, A. O. (2015): A full Cycle of Groundwater Provision Endeavour From Exploration to Exploitation: Case Study of an Industrial Standard Borehole in part of Ekiti State University Campus Ado Ekiti, Southwest Nigeria. International Journal of Advancement in Engineering Technology, Management and Applied Science, 2(1), 1-21
Adepelumi, A. A., Akinmade, O. B and Fayemi, O., (2013): Evaluation of Groundwater Potential of Baikin Ondo State Nigeria Using Resistivity and Magnetic Techniques: A Case Study. Universal Journal of Geoscience 1(2): 37-45.
Afolayan, J. F., Olorunfemi, M. O and Afolabi, O., (2004): Geoelectric/Electromagnetic VLF Survey for Groundwater in a Basement Terrain: A Case Study. Ife Journal of Science. 6(1):74-78.
Akande, W. G., Idris-Nda, A., Amadi, A. N., Abdulfatai, I. A., Alabi, A. A and Yahaya, T., (2016). Evaluation of groundwater potential of Chanchaga area, Minna, north-central Nigeria. American Journal of Innovative Research and Applied Science 2(1):1-9
Bienibuor, A. K., Preko, K., Wemegah, D. D and Manu, E., (2016): The use of electromagnetic and electrical resistivity methods in assessing groundwater resource potentials in Adoe, Sunyani, Ghana. International Journal of Scientific and Technology Research 5(9):166-170.
Claris C. Nwachukwu, Charles C. Ugbor, Osim and Jethro Ogboke (2022): Electrical Resistivity Sounding for Groundwater Investigation around Enugu Metropolis and the Environs, Southeast Nigeria. International Journal of Geosciences, 13, 54-70.
Erricaker, B. C., (1971): Advanced General Statistics. Printed in Great Britain for Hodder and Stoughton Educational. Pp 68-105
Ochuko, A., (2013) Investigation of Groundwater Potentialin Some Selected Townsin Delta North District of Nigeria. International Journal of Applied Science and Technology 2(9): 61-66.
Kumar, J. R. T., Dushiyanthan, C., Thiruneelakandan, B., Suresh, R., Vasanth Raja., S., Senthilkumar, M and Karthikeyan, K., (2016): Evaluation of Groundwater Potential Zones using Electrical Resistivity Response and Lineament Pattern in Uppodai Sub Basin, Tambaraparani River, Tirunelveli District, Tamilnadu, India. Journal of Geology and Geophysics doi:10.4172/2381-8719.1000241
Nicholas, U. U., Rubeni, T. R., Rapelang, E. S and Ghebrebrhan, O., (2016) Geoelectric Evaluation of Groundwater Potential and Vulnerability of Over burden Aquifers at Onibu‐Eja Active Open Dumpsite, Osogbo, South western Nigeria. Journal of Water Resource and Protection, 2016, 8, 311‐329
Ojo, O. F. and Ademilua, O. L. (2013): A Correlation of Wenner Array Geoelectric Log with Borehole Lithologic Log. Research Journal in Engineering and Applied Sciences, 2(2), 126-131
Ojo, J. S., Ayangbesan, T.A., and Olorunfemi M.O (1990): Geophysical survey of a dam site: a case study Journal of mining and geology vol. 26. pp 201- 206
Okogbue, C. O and Omonona, O. V., (2013) Groundwater potential of the Egbe-Mopa basement area, central Nigeria. Hydrological Sciences Journal 58(4): 826-840.
Oladunjoye, H. T., Odunaike, R. K., Ogunsola, P and Olaleye, O. A., (2013) Evaluation of groundwater potential using electrical resistivity method in Okenugbo area, Ago - Iwoye, southwestern, Nigeria.International Journal of Engineering and Applied Sciences, 4(5): 22-30.
Olasehinde P.I., and Taiwo, K.A. (2000): A correlation of schlumberger array geoelectric log with borehole lithologic log in the southwestern part of the Nigeria Basement Complex terrain. Journal of Nigerian Association of hydro geologist vol.11. Pp 59-60
Olayinka, A.I., (1996): Non uniqueness in the interpretation of bedrock resistivity from sounding curves and its hyrogeological implications. Journal of Nigerian Association of Hydrogeologist. Vol 7, No. 1 & 2. Pp 49 -55.
Sunmonu, L.A., Adagunodo, T.A., Adeniji, A.A. and Ajani, O.O. (2018): Geoimaging of subsurface fabric in Awgbagba, Southwestern Nigeria using geomagnetic and geoelectrical techniques. Malaysian J. Fundam. Appl. Sci. 14 (2), 312–324.
Talabi, A. O. and Tijani, N. M. (2011). Integrated remote sensing and GIS approach to groundwater potential assessment in the basement terrain of Ekiti area southwestern Nigeria. RMZ – Materials and Geoenvironment, Vol. 58, No. 3, pp. 303–328.
Wannamaker, P.E., Stodt, J.A., Maris, V., Hill, G.J., Pellerin, L., Peacock, J.R. and Bedrosian, P.A., (2016): Magnetotelluric imaging of the Valles Caldera resurgent magma system: implications for magma reservoir size and depth. Geophys. Res. Lett. 43 (3), 1053–1060.