Browsing by Author "Olawuyi, Kehinde"
Now showing 1 - 14 of 14
Results Per Page
Sort Options
Item An Assessment of Groundwater Potential of Parts of Ikono LGA (Akwa-Ibom State), S.E. Nigeria(Nigerian Association of Hydrogeologists, 2003) Olasehinde, Ibikunle; Olawuyi, KehindeThe groundwater potential of an area of 1406 Km2 within the Benin formation-southeastern Nigeria has been assessed based on data from six boreholes sunk at various locations within the Ikono Local Government Area of Akwa-Ibom State, Nigeria. The Benin formation is composed of loosely consolidated sands and gravels with minor intercalations of shale. The sands are poorly sorted, sub-rounded to rounded, medium to coarse grained and often pebbly. The characteristics of the borehole determined include: lithologic log, yield, drawdown, hydraulic conductivity and transmissivity. The yield ranges between 472.32-1918.4 m3/day while the transmissivity ranges between 106.08-700.84 m2/day. The findings indicate the area to have moderate to high groundwater potentials. The borehole production could have been better if the borehole drilling had been preceded by thorough geophysical studies to pick more favourable locations.Item Evaluation of Vertical Electrical Sounding Method in Groundwater Development in the Basement Complex Terrain of West-Central, Nigeria.(Faculty of Engineering and Technology, University of Ilorin, Nigeria, 2013) Olawuyi, Kehinde; Abolarin, SolomonThis research evaluated the Vertical Electrical Sounding (VES) method of groundwater development in the Basement Complex terrain of West Central Nigeria. It was aimed at verifying the reliability of VES in differentiating lithologies, predicting the depth to basement and probably, aquifer in groundwater development. In doing this, the Schlumberger electrode configuration was employed in the surveys while partial curve matching and computer iteration techniques were used to interpret the curves obtained. In all, seventy three VES were carried out and fourteen boreholes constructed. Comparison was made between the predicted depth to basement from VES and the actual depth from the drilling log. A linear relationship between the actual depth and that predicted by VES was established with coefficient of determination of 0.94 confirming the reliability of the VES method. None of the boreholes drilled was abortive.Item Exploration for Groundwater and Delineation of Lineament Features using Geoelectrical Method in the Tanke Area of Ilorin, Kwara State, Nigeria(Nigerian Association of Mathematical Physics, 2019-05) Olawuyi, Kehinde; Adelodun, SamuelThe exploration for groundwater and delineation of lineament features using geoelectrical method in the Tanke area of Ilorin, Kwara State, Nigeria was carried out. Twenty Schlumberger Vertical Electrical Soundings (VES) were carried out with a view to establishing the different subsurface geoelectric layers, the aquifer units and the lineament features. Data collected from several VES points using DDR1 resistivity meter equipped with an SAS 2000 booster were analyzed. From the quantitative interpretations of the data collected, using the usual method of curve matching with the Orellana-Mooney Master curves and 1-D forward modeling with IPI2WinTM v2.0 software, between three to five geoelectric strata were identified in the area. These include: the topsoil, the lateritic soil, the weathered basement, the fractured basement and the fresh bedrock. The weathered layer and the fractured basement constitute the main aquifer units. The type curves in the study area include: H, QH, AKH, A, HA and KH. The H type curves are predominant. The depths to bedrock at the chosen VES locations vary from 2.8 to 27.5 m with a mean value of 11.92 m in the study area. The depths to the top of aquifers range from 0.2m at shallowest point to 4.5m at the deepest point from the ground surface, with generally low resistivity values (≤ 100 Ω-m). The main river that drains the area coincides with the inferred lineament which suggests a structural control of the drainage. The general lack of thick overburden in the study area explains why the wells and shallow boreholes drilled in the area dry up during the dry season, a situation that makes the residents to engage in drilling deep boreholes sometimes as deep as 100m or more.Item Geo-electrical Exploration for Ground-water in Ajelanwa, Owa Otun and Ogga Communities in the Middle-Belt region of Nigeria.(Nigerian Association of Mathematical Physics, 2015) Olawuyi, KehindeSchlumberger Vertical Electrical Soundings (VES) for groundwater exploration in Ajelanwa and Owa Otun Communities in Kwara State and Ogga in Kogi State, in the Basement Complex terrain of the Middle-Belt Region of Nigeria were carried out with a view to establishing the different subsurface geoelectric layers and the aquifer units. Data were collected from 4, 5 and 5 VES stations at Ajelanwa, Owa Otun and Ogga Communities respectively. From the quantitative interpretations of the data collected, using the usual method of curve matching with the Orellana-Mooney Master curves and 1-D forward modeling with WinResist 1.0 version software, up to four lithologic units were identified in these Communities. These include: the topsoil, the weathered layer, the partly weathered/fractured basement and the fresh basement. The weathered layer and the partly weathered/fractured basement constitute the main aquifer units. The depth to bedrock at the chosen VES locations vary from 6 to 30 m at Ajelanwa Community while at Owa Otun and Ogga Communities, it vary from 7 to 13 m and 25 to > 60 m respectively along the chosen traverses. The geoelectrical interpretations of data obtained in these areas have permitted the delineation of some lobes or areas of low resistivity which constitute the prospective zones for water exploration in these areas.Item GEO-ELECTRICAL EXPLORATION FOR GROUND-WATER IN GBATAKO, EDU L.G.A. , KWARA STATE, NIGERIA.(Faculty of Science, University of Ilorin, Nigeria., 2013) Olawuyi, KehindeSchlumberger Vertical Electrical Soundings (VES) for groundwater exploration in Gbatako, Edu Local Government Area (L.G.A.) of Kwara State, was carried out with a view to establishing the different subsurface geoelectric layers, the aquifer units and their hydrogeologic properties. Data were collected from 5 VES stations. From the quantitative interpretation of the data collected, using the usual method of curve matching with the Orellana-Mooney Master curves and 1-D forward modeling with WinResist 1.0 version software, four lithologic units were identified. The resistivity data interpretation has revealed three lobes of low resistivities which constitute the prospective zones for water in the area to exist below station 1 at depth 5.5 to 19.7m (with resistivity 101.7 ohm-m), station 2 at depth 8.6 to 19.4m (with resistivity 144 ohm-m) and station 4 at depth 11.8 – 25.2m (with resistivity 83.5 ohm-m) . The study concluded that the best location in the study area to site a borehole is station number 1 as it contains a major lobe of low resistivity which could be explored for water supply.Item Geo-electrical Exploration for Groundwater in Jimba-Oja, Ifelodun Local Government Area of Kwara State, Nigeria(Jimma University, Jimma, Ethiopia., 2014) Olawuyi, Kehinde; Oluwole, VictorVertical Electrical Soundings (VES) and Horizontal Profilings (HP) for groundwater exploration in the Agricultural and Rural Management Training Institute (ARMTI) and National Centre for Agricultural Mechanization (NCAM), both located at Jimba-Oja, Ifelodun Local Government Area (LGA) of Kwara state, were carried out with a view to establishing the different subsurface geo-electric layers, the aquifer units and their hydrogeologic parameters. Data were collected from 25 VES stations situated within latitudes 40 39’ and 40 41’ and longitudes 80 22’ and 80 23.5’, three of which have been drilled. From the quantitative interpretation of the data collected, using the usual method of curve matching with the Orellana-Mooney Master curves and 1-D forward modeling with WinResist 1.0 version software, four lithologic units were identified. These include: the topsoil, the lateritic layer, the weathered/fractured layer and the fresh basement. The weathered/fractured basement constitutes the main acquifer unit. The isopach map of the overburden shows depth to the bedrock varying from 2.8 to 28m. The geoelectrical interpretation of data obtained in this area has permitted the delineation of a lobe of low resistivity which constitutes the prospective zone for water exploration in the area.Item Geo-electrical Exploration for Groundwater Within the Premises of University of Ilorin Teaching Hospital, Ilorin, Kwara State, Nigeria(Faculty of Engineering and Technology, University of Ilorin, Nigeria, 2012) Olawuyi, KehindeSchlumberger Vertical Electrical Soundings for groundwater search within the premises of University of llorin Teaching Hospital (UITH) situated along Ilorin-Jebba road in Kwara state, were carried out with a view to establishing the different subsurface geoelectric layers, the aquifer units and their hydrogeologic properties. Data were collected from 12 VES stations over·an area of about 500m x 650m. From the quantitative interpretation of the data collected, using the usual method of curve matching with the Orellana-Mooney Master curves and 1-D forward modeling with WinResist 1.0 version software, four Iithologic units were identified. These include: the topsoil, the lateritic layer, the weathered layer/fractured layer and the fresh basement. The weathered and fractured basement constitute the main aquifer units. The 2-D resistivity structure has elicited 2 lobes of low resistivity which constitutes the prospective zone for water in the area. The first lobe exists.below stations 3 and 4 at about 5-15 m depth, with resistivity between 80- 147 ohm-m and over 300 m wide, while the other lobe of low resistivity which also signifies a possible borehole location exists below stations 7, 8 and 9 at a depth of about 2-14 m, with resistivity between 141- 200 ohm-m over 150 m wide. The study concluded that the area investigated contains two lobes of low resistivity which could be explored for water supply.Item A Gradient Analysis-Based Study of Aeromagnetic Anomalies of Some Dikes in the Nupe Basin of Nigeria.(Federal University of Technology, Minna, Nigeria., 2013) Olasehinde, Ibikunle; Olawuyi, KehindeAn aeromagnetic intensity contour map of a part of Nupe Basin of Nigeria was acquired, digitized and analysed. This work was carried out for a better understanding of the study area using the Gradient analysis-based technique to calculate depth to basement and to interpret the aeromagnetic anomaly map of the area. Statistical method of Olasehinde (1991) was employed to produce a geological map of the area. Regional-residual separation of the total intensity map was done to produce a residual aeromagnetic intensity data. Depths to the magnetic source bodies were estimated from the profiles obtained from residual data using Pal’s (1985) gradient analysis method. The estimated depths ranged from 0.44km to 1.67km which agrees with those predicted by some earlier workers on the Nupe Basin. These depths fall within the lithospheric layer of the earth and the causative magnetic anomalies body are likely basic intrusives. While this approach appears cheap, accurate and cost-effective, it is recommended that other ground geological and geophysical techniques be applied to further strengthen the assertions made in this work.Item Groundwater Potentials of Some Parts of the Federal Capital Territory, Abuja, Nigeria.(National University of Science and Technology, Bulawayo, Zimbabwe., 2016) Olawuyi, Kehinde; Katchy, ChukwumaA hydrogeophysical study was carried out in some parts of the Basement Complex terrain of Abuja, the Capital of Nigeria, to investigate the groundwater potential of the subsurface layers. Severe water shortage due to increase in population, social and economic activities has prompted this study on the development of the groundwater resources. Schlumberger Vertical Electrical Soundings (VES) for groundwater exploration in the Nigerian Police barracks in some parts of the Federal Capital Territory, Abuja, Nigeria were carried out with a view to establishing the different subsurface geoelectric layers and the aquifer units. Data were collected from several VES stations at Utako, Dei-Dei, Wuse 2 and Kuje Junction barracks. From the quantitative interpretations of the data collected, using the usual method of curve matching with the Orellana-Mooney Master curves and 1-D forward modeling with WinResist 1.0 version software, between three and four lithologic units were identified in these areas. These include: the topsoil, the weathered basement, the fractured basement and the fresh bedrock. The weathered layer and the fractured basement constitute the main aquifer units. The depth to bedrock at the chosen VES locations vary from 3.8 to 15.1 m in the study area. The geoelectrical interpretations of data obtained in these areas have permitted the delineation of some lobes or areas of low resistivity which constitute the prospective zones for water exploration in these areas.Item Integration of Magnetic, Gravity and Geologic Data in Mapping Geologic Structures: A Case Study of a Part of Lafiagi (Sheet 203), Southwestern Nigeria.(AAPG Datapages, Inc., 2015-11-30) Olawuyi, Kehinde; Ako, Bankole; Omosuyi, Gregory; Adelusi, ObasanmiStructural evaluation of the pegmatite-rich zones in a part of the Lafiagi (Sheet 203), southwestern Nigeria was carried out. It was aimed at the identification of the structures responsible for both the hydrogeology and rich mineralization of the area. This work involved the qualitative and quantitative analysis of aeromagnetic, pseudo-gravity, and geological data using Oasis MontajTM and Rockwork15TM software. The 3-D Euler Deconvolution and 2-D Forward modeling and inversion of the acquired aero-magnetic and pseudo-gravity data augmented with geological information obtained from reliable sources were employed in the lineaments extraction and other structural interpretation works. The results have shown that the identified faults and lineament features obtained from geophysical data generally coincide with the river channels on the geologic and drainage maps. This indicates a structural control of the drainage system while the abundance of 2D and 3D structures that are commonly associated with gemstones and precious minerals explain why the study area is rich in mineral deposits.Item Lineaments Mapping for Hydrogeological Study Using Aeromagnetic and Pseudogravity Data: A Case Study of Lafiagi, Southwestern Nigeria.(National University of Science and Technology, Bulawayo, Zimbabwe, 2015) Olawuyi, KehindeLineaments mapping over a part of the transition environment between the Basement Complex rocks of the southwestern Nigeria and the Sedimentary rocks of the Nupe Basin was carried out. It was aimed at identification of the structural features responsible for the hydrogeology of the area. This work involved the qualitative and quantitative analysis of aeromagnetic and pseudo-gravity data using Oasis MontajTM and the geological data using Rockwork15TM software. The 2-D Forward modeling and inversion of the acquired aero-magnetic and pseudo-gravity data augmented with geological information obtained from reliable sources were employed in the lineaments extraction and interpretation works. The results have shown that the identified faults and lineament features obtained from geophysical data generally coincide with the river channels on the geologic and drainage maps which indicate a structural control of the drainage system in the study area. The rose diagram of the extracted faults and lineament features showed a preponderance of NE/SW trend followed by NW-SE and N-S trends.Item Mapping of Lineament Structures using Potential Fields Data in Lafiagi Area, Central Nigeria.(Faculty of Physical Sciences, University of Ilorin, Nigeria., 2017) Olawuyi, KehindeAn evaluation of the lineament features over a part of the transition environment between the Basement complex rocks of the southwestern Nigeria and the Sedimentary rocks of the Nupe Basin was carried out. It was aimed at identification of the structural features responsible for the tectonics and hydrogeology of the area. The work involved the qualitative and quantitative analysis of aeromagnetic data and pseudogravity transforms using Oasis MontajTM. The 3-D Euler Deconvolution results from acquired potential fields data, augmented with geologic information were employed in the lineaments extraction and interpretation work. The results have shown that the mapped lineament features generally coincide with the river channels on the geologic and drainage maps which indicate a structural control of the drainage system in the study area. The rose diagram of the extracted Euler solutions’-based lineament features and that of the local geology showed a predominance of NE-SW and N-S trends respectively, typical of the post-Pan African lineaments.Item Structural Classification Using Aeromagnetic Data and Pseudogravity Transforms: A Case Study of Pategi Area of Bida Basin, Nigeria(College of Natural and Applied Sciences, University of Dar es Salaam, Tanzania, 2018) Olawuyi, KehindeThe structural classification with 3D Euler deconvolution method in the Pategi area, a transition environment between the Basement complex rocks of the southwestern Nigeria and the Sedimentary rocks of the Nupe Basin was carried out. It was aimed at identification of the structural features responsible for the hydrogeology and mineralization potentials of the area. This work involves the qualitative and quantitative analysis of aeromagnetic data and pseudogravity transforms using Oasis MontajTM. The 3-D Euler deconvolution of the acquired aeromagnetic data and pseudogravity transforms using Oasis montajTM software and the geologic information on this area was employed in the structural classification work. The extracted faults and lineament features are mostly trending in the NW/SE and NE/SW directions. Earlier workers have recorded oil seepage within this Sheet (204), which is adjacent to the pegmatite rich Lafiagi area. Also, the abundance of 2D and 3D structures that are commonly associated with gemstones and precious minerals explain why the study area is a prospective mineralized zone.Item The Use of Electrical Resistivity Survey in Locating Aquifers in Ilorin Area of Kwara State, Nigeria.(Nigerian Association of Mathematical Physics, 2013) Olawuyi, Kehinde; Abolarin, SolomonThis research involved the use of electrical resistivity survey method for groundwater exploration in Ilorin area of Kwara State, Nigeria. The Vertical Electrical Sounding (VES) using Schlumberger array with the maximum spread of 200 m and partial curve matching/computer iteration techniques were used to interpret the data with the aim of accurately predicting the depth to basement and aquifer. A total of ninety five VES were carried out and thirteen boreholes constructed. The predicted depths to basement from VES and the actual depths from the drilling logs show a good agreement with each other and with results obtained from literature. The results of the research also confirmed the already known geological units of the western Nigeria Basement Complex Terrain and the drilling exercise was successful.