Applied Geophysics
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Applied Geophysics
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Item GEOPHYSICAL INVESTIGATION OF WESTERN PART OF FEDERAL UNIVERSITY OF TECHNOLOGY, GIDAN KWANO CAMPUS, MINNA, NIGER STATE, USING ELECTRICAL AND SEISMIC REFRACTION METHODS(Natural and Applied Sciences Journal, 2010) ADETONA, Adebayo Abbass, Salako, K .A., Abdulrashid, U.A; Rafiu, A.A., Ofor, N.P., Alhassan D.U. and Jonah S.A.A geophysical survey of western part of Federal University of Technology, Gidan Kwano Campus, Minna, was carried out using Electrical Resistivity (VES) and Seismic refraction methods. The aim of this survey was to determine the ground water potentials of the area and to also locate those areas that could be useful for civil engineering purposes. Careful interpretation of the seismic data obtained shows two geologic sections within the survey area. The first layer has an average seismic velocity value of 1237.86 ms-1 . The second layer is the refractor layer whose seismic velocity average is 4581.67 ms-1 and has an average depth of 4.74m. The results obtained from the electrical resistivity method also shows that the survey area consists of three geoelectric/geologic layers. The first layer has resistivity values between 20m and 200m, which represents topsoil the second layer has resistivity value ranging from 200m to about 900m and typifies weathered and fractured basement. The fresh basement forms the third layer with resistivity value above 1000m. The results obtained from both methods shows that the area appropriate for ground water development were found in the north-east and north-central portion of the survey area with aquifer systems of 100m in width and depth between 3.8m and 25m. Similarly the site most appropriate for civil engineering purpose could be located at the southern part of the survey area where the fresh basement is shallow.Item PRELIMINARY ASSESSMENT OF GROUNDWATER POTENTIAL AND STRUCTURAL DEVELOPMENT AT POMPOM VILLAGE, MINNA, NORTH CENTRAL NIGERIA USING ELECTRICAL PROFILING METHOD(Journal of Science, Technology, Mathematics and Education (JOSTMED), 2012-04) ADETONA, Adebayo Abbass, 10. Rafiu A.A., T.A Adesete, Salako K. A., Alhassan U.D,The result of preliminary study of ground water assessment and structural development at Pompom village is presented. The profiling data were collected over a total number of sixty-six (66) VES points covering 500m by 1km, using Werner configuration method. The field was divided into two measuring 500m by 500m and the data collected were analyzed separately. The profiling data were analyzed using both Surfer 8 and Microsoft Excel package. The results of the analyses shows that the areas identified as suitable for ground water exploitation are northeast and southern parts of the study area where resistivity values are relatively low. Areas or points identified for civil engineering development are areas identified with relatively high resistivity values, these areas correspond to VES: B2, C1, C2, C4, D3, F3, F4 C’4 and F’1.Item 2-DIMENTIONAL MODELS OF THE STRUCTURAL FEATURES WITHIN THE LOWER BENUE AND UPPER ANAMBRA BASINS NIGERIA, USING (2009) AEROMAGNETIC DATA(Journal of Science, Technology, Mathematics and Education (JOSTMED),, 2015-08) ADETONA, Adebayo Abbass, ABU MallamAnalysis base on the CET shows that the basement rocks to the North and Southern edge of the study area intrude into the sedimentary formation. At the lower (middle-portion) of the study area (within Angba and Otukpo sheets) are structures that are Basaltic rocks that intrude into the basement. It is believed that these structures must have predated the depositional period of the sedimentary formation. Several fracture and fault lines are detected on the CET map, most prominent among is that which start from the Eastern end (latitude 7.450 and longitude 8.300 ) and ends at the Southern end (Latitude 7.000 longitude 7.450 ).cutting the South Western corner of the study area diagonally. Secondly is that which runs vertically and is parallel to the course of River Niger within this area, supporting the assertion that the River Niger is structurally controlled. The 2-dimentional models of the six profiles revealed sedimentary formations whose susceptibility values are zero (0). Maximum depth of about ten (10) kilometers was obtained within the Southern end of the study area, but a maximum thickness of sedimentation of about four (4) kilometers was observed on profile six within Nkporo formation. The basement susceptibility varies from 0.002 to 0.004 but in some places it is as high as 0.007. Structural, 2-dimensional, Exploration Targeting, Total Magnetic IntensityItem Interpretation of Aeromagnetic data over parts of Bida Basin, north Central, Nigeria.(2017) ADETONA, Adebayo Abbass, 37 Alkali A., Salako, K.This study focuses on the analysis and the qualitative and quantitative interpretation of aeromagnetic data over the southern part of Bida basin. The study area covers an area of 24,200 km2 located between latitude 80 30ꞌN and 90 30ꞌN and longitudes 50 00ꞌE and 70 00ꞌE. Aeromagnetic data in grid format containing eight sheets were analysed and interpreted. This study employed several magnetic filtering methods to investigate lineaments and other structural features; reduction to the equator, horizontal derivatives, upward continuation, vertical derivatives, analytical signal, and Centre for exploration targeting grid analysis. Depth estimates using Source parameter Imaging and Euler Depth determination method reveal a maximum depth of 4.2 km around Mokwa and batati areas. Shallow sources also exist around pategi, paiko, Izom and Lapai areas with an average depth ranging from 107.74 m to about 514.82 m. A maximum thickness of sedimentation of 4.0 km was obtained along the modelled profile trending NE-SW. The regional fields of the study area have a trend of NW-SE with some minor structures trending in the NE-SW direction. The study area was found to have a good potential for mineral and hydrocarbon exploration.Item DETERMINATION OF DEPTH TO MAGNETIC BASEMENT OVER BIU PLATEAU AND YOLA SUB-BASIN, NORTHEASTERN NIGERIA, USING SOURCE PARAMETER IMAGING (SPI) AND EULER DECONVOLUTION TECHNIQUES(Nigerian Journal of Physics, 2018) ADETONA, Adebayo Abbass, 34 Bello Sani, Udensi, E, E., Salako K.A.Quantitative analysis of aeromagnetic data covering total area of 48,000 km2 on latitude 11.000 N to 13.000 N and Longitude 9.000 E to 11.000 E, which corresponds to Basement Complex part of upper Benue trough northeastern, Nigeria was carried out with the aim of estimating the sedi mentary thickness using Source parameter imaging and Euler deconvolution. The study area is c overed by sixteen (16) aeromagnetic data sheet. Aeromagnetic data were analysed using the Oasi s Montaj 8.3 software. The total magnetic map was reduced to magnetic equator with geomagnet ic inclination of -4.3° and geomagnetic declination of -1.0o so as to get the actual position of the anomalies. The pre-processed grids dx, dy and dz from the reduced to magnetic equator map wer e used as input grids to calculate the source parameter imaging and Euler deconvolution. The res ults from the total magnetic intensity (TMI) and TMI - RTE shows that magnetic intensity values range from -94.1 nT to 235.5 nT and -80.261 nT to 234.153 nT respectively. The results indicate a dominant NE-SW, NW – SE and E – W orientation of faults and were also identified mostly at the edges of sediments-basement contacts. The result from SPI ranges from 0.110 km (shallow magnetic bodies) is observed at the northeast part of the study area which is made of crystalline rocks to 3.243 km (deep lying magnetic bodies) is observed at the Northwest, Southeast and Sou thwest part of the study area. The depths of the magnetic source bodies estimated from Euler dec onvolution for the structural index SI = 1 ranges from 0.094 km (out cropping magnetic bodies) t o 3.32 km (deep lying magnetic bodies). The shallower magnetic anomalies are as a result of bas ement rocks which intruded into the sedimentary rocks while the deeper magnetic anomalies are associated with magnetic basement surface and intra basement discontinuities like faults and frac tures. The maximum sedimentary thickness of about 3.24 km and 3.32 km from SPI and Euler d econvolution respectively might be sufficient for hydrocarbon maturation in the area.Item INVESTIGATING THE GEOTHERMAL POTENTIAL WITHIN BENUE STATE, CENTRAL NIGERIA, FROM RADIOMETRIC AND HIGH RESOLUTION AERO MAGNETIC DATA(Nigerian Journal of Physics, 2018) ADETONA, Adebayo Abbass, Akinnubi, Tunde DanielThe study focuses on the analysis of high resolution Aeromagnetic data for the estimation of geot hermal potential within the eastern part of Lower Benue Basin and correlating the results from th e analysis of radiometric concentration data of the study area. The study area covers a total area o f 18,150 km2 , six aeromagnetic sheets cover the area, major towns are Markudi, Gboko,Otukpo, Agena, Akwana and Katsina-Ala, it is bounded by latitude 7.000 and 8.000 and longitude 8.000 a nd 9.500 . The aeromagnetic data was subjected to Fourier analysis and then spectral analysis of 12 sub sections was carried out. From the spectral analysis, the depth to the top of magnetic sourc es varies from 0.28 Km to 0.36 Km while the depth to the bottom of magnetic sources varies fro m 5.52 Km to 9.63 Km. The modified Curie depth method was employed in evaluating the Curie point depth, heat flow and geothermal gradient were also obtained. The region found to have a sh allow Curie depth of 9 km at the south-western and south-eastern part of the study area has an av erage geothermal heat flow 103.98 Wm-2. The geothermal gradient also has a value of 62Ԩ/km a nd 30Ԩ/km respectively with an average value of 41.59 oC/km, anomalous high heat flow of 153. 35, and 135.62 Wm-2 was obtained within around Katsina- Ala and Oturkpo respectively. Correlat ing this result with the analysis of the radiometric values covering the study area, the ternary map shows that potassium and thorium radioactive content is noticeably high within these areas wher e relatively high heat flow values were obtained, The radioactive heat production within the two e xothermally active areas was estimated to be1.47 μW/m3 and 2.21 μW/m3 respectively this can be associated with the occurrence of these elements.Item Estimating the Thickness of Sedimentation within Lower Benue Basin and Upper Anambra Basin, Nigeria, Using Both Spectral Depth Determination and Source Parameter Imaging(Hindawi Publishing Corporation, 2013-04) ADETONA, Adebayo Abbass, and Abu MallamThe Total Aeromagnetic Data covering the study area was subjected to First Vertical Derivative, Spectral Depth Analysis, and Source Parameter Imaging (SPI). The result from the First Vertical Derivative shows that the Northern part of the area is covered by the young biotite granite of Precambrian origin, and the western edge is covered by the old granite, gneisses, and migmatite of Western Nigeria, while the remaining area is covered by the cretaceous sedimentary deposits. The entire area was divided into forty-eight sections. Spectral Depth Analysis was run for each of these forty-eight sections; the result shows that a maximum depth above 7 km was obtained within the cretaceous sediments of Idah, Ankpa, and below Udegi at the middle of the study area. Minimum depth estimates between 188.0 and 452 meters were observed around the basement regions. Results from Source Parameter Imaging show a minimum depth of 76.983 meters and a maximum thickness of sedimentation of 9.847 km, which also occur within Idah, Ankpa, and Udegi axis. The disparity observed in depth obtained by each method is discussed based on the merit and demerit of each method, and the depths obtained were compared with results from previous researchers. Geophysical implication of the result to oil and gas exploration in the area is briefly discussedItem CURIE DEPTH AND GEOTHERMAL GRADIENT FROM SPECTRAL ANALYSIS OF AEROMAGNETIC DATA OVER UPPER ANAMBRA AND LOWER BENUE BASIN, NIGERIA.(Nigeria Journal of Technological research, 2017) ADETONA, Adebayo Abbass, SALAKO, K.A and Rafiu A.AA high amount of heat flow from a shallow curie depth is essentially related to a promising geothermal resource. This work explores the depth of demagnetisation due to high radiogenic heat content of the basement rocks. The Total Magnetic Intensity and the radiometric data, consisting of the Potassium count, the Uranium and Thorium equivalents, were employed for the research work. Sheet 145 (Kajuru) and 146 (Geshere) both on latitude 10°00'N to 10°30'N and longitude 7°30'E to 8°30'E covering 6,050 km2 within Kaduna State of Central Nigeria is an area with notedly high concentrations of these radionuclide by previous researchers. A shallow Curie point depth of 8.43 km was observed below Wugana while heat flow values ranging from 81.9 mW/m2 to 171.9 mW/m2 was estimated with an average of 167.8 mW/m2. Also, the geothermal gradients varied from 32.76 to 68.8 0CKm-1, with an average value of 67.16 0CKm-1. The effect of heat generated from the Potassium count, equivalent concentrations of Uranium and Thorium indicated the Northern end down to the Mid-western end displays medium to high radiogenic heat production. In conclusion, areas with low Currie depth that coincide with relatively high radiogenic heat production are located within Wugana, New Kwasan, and down to Ron villages, which are generally located at the Mid-North and Mid-Western areas with intrusive granitic rocksItem Geotechnical Investigation on Road Failure of Part of London Road Minna, Nigeria(JP JUPITER PUBLISHER, 2019) ADETONA, Adebayo Abbass, Ndanusa H. H, Rafiu A. A,Salako K.A, Alhassan U,D,stract Geotechnical investigation involving Atterberg limit, CBR, Compaction and Sieve analysis were conducted at part of London Road Minna, Niger State. The aim of the study was to investigate the causes of road failure. The CBR range between 54.1% to 64.2%, the liquid limit of the soil ranged from 16% to 17.90%, the plastic limit is zero. The CBR, the percentage passing sieve range from 29.4% - 99.5%. Based on the 80% minimum CBR, 35%maximum percentage passing sieve 0.075mm, 12% maximum plasticity index and 35% maximum liquid limit required for material to be used as a base course material for road construction as specified by Nigeria general specification for road and bridge work. All the samples tested do not meet the requirement highlighted above. Therefore, the samples cannot be used as base course material for the studied location.