ANALYSIS OF HIGH RESOLUTION AEROMAGNETIC DATA OF SOME PARTS OF BENUE TROUGH, NIGERIA
Abstract
This work is aimed to determine the depth to basement of some magnetic sources in the study area. Four aeromagnetic sheets were acquired from the Nigerian Geological Survey Agency which includes (Bajoga, 131, Gulani, 132, Gombe, 152 and Wuyo, 153). The study area covers an estimated area of about 12100km2 between latitude 90N-110N and longitude 110E-130E. The total magnetic field of the study area have been evaluated. In order to determine the basement depth, spectral analysis technique was applied. Detailed analysis of the aeromagnetic data for the study area was performed. The procedure involved in the analysis include reduction to equator to remove the effect of inclination, contouring of the total magnetic intensity, separation of the regional and residual anomalies using polynomial fitting of first order, qualitative interpretation and quantitative interpretation. The residual field of the study area composes of low magnetic anomalies reaching a minimum value of -158.6nT as observed in the northern and southern parts and high magnetic anomalies reaching a maximum value of 178.1nT as observed in the western part of the study area. The result from the spectral analysis for each block shows that the depths to the magnetic source are 5.20Km for block 1, 5.74Km for block 2, 7.59Km for block 3 and 3.56Km for block 4. The average depth to magnetic source in the study area was found to be 5.52Km. Based on the computed average sedimentary thickness obtained in this study area, hydrocarbon accumulation in the study area is feasible.
References
Akusika and Joshua (2020). Integrated approach to depth to basement enhancement of Ijebu Ode, a location in South-western Nigeria using aeromagnetic data. Journal of earth science and geotechnical engineering, 10(2), 1 – 14.
Alabi e al (2019). Estimation of magnetic contact location and depth of magnetic sources in a sedimentary formation. Material and geoenvironment, 66(1), 27 – 37.
Anudu et al (2020). Basement morphology of the middle Benue trough, Nigeria, revealed from analysis of high resolution aeromagnetic data using grid based operator method. Journal of African earth science, 162, 103724.
Ayuba and Ahmed (2019). Interpretation of high resolution aeromagnetic data for hydrocarbon potentials over parts of Nasarawa and environs North central Nigeria. World, 4(1), 1 – 11.
Bello et al (2018). Determination of Depth to basement using spectral analysis of aeromagnetic data over biu plateau Basalt and Yola sub-basin North east Nigeria. IJSR vol.7, 246.
Charles, O.O (1985). A review of the geology of the Benue Trough, Nigeria. Journal of African Earth science, 3(3), 283 – 291.
Chifu et al (2019). Application of aeromagnetic and electrical resistivity for mapping spatioal distribution of groundwater potentials of Dutse, Jigawa state, Nigeria. Mordern applied science, 13(2), 11-20.
Ikumbur et al (2019). Subsurface structural mapping over Koton Karifi and adjoining areas, Southern Bida Basin, Nigeria, using high resolution aeromagnetic data. Nigerian journal of invironmental science and technology (NIJEST). 3(2), 304 – 316.
Khalid et al (2020). Magnetic data interpretation using advance techniques: a comparative study. Geophysics, 30, 263 – 294.
Lucic (2019). Regional geology and petroleum systems of the main reservoirs and source rock of the North Africa and the Middle East. The geology of the Arab world, Spriger Geology, 197 – 289.
Mohammad et al (2014). Evaluation of magnetic basement depth over parts of Bajoga and environs, north-eastern Nigeria using Stanley’s method. Journal of applied geology and geophysics, Vol.2, 47-53.
Mukaila el al (2019). Magnetic basement depth from high resolution aeromagnetic data of parts of lower and middle Benue Trough Nigeria using scaling spectral method. Journal of African earth science. 150, 337 – 345.
Negi,J.G. et al (1983). Three dimensional model of the konya area of Maharashtra state (India) based on the spectral analysis of aeromagnetic data. International journal of science and research. 1(2). Pp 47-53.
Okonkwo et al (2012). Aeromagnetic interpretation over Maiduguri and environs of Southern Chad Basin, Nigeria. Journal of Earth and Geotechnical Engineering. Vol 2(3), pp77-93, Scienpress.
Onwuemesi, A (1997). One dimensional spectral analysis of aeromagnetic anomaly and curie depth isotherm in Anambra Basin of Nigeria. Journal of geodynamics. 23(2): 95-107.
Pascal (2019). Curie depth estimation from magnetic anomaly data. A re-assessment using multitaper spectral analysis and Bayesian inference. Geophysical Journal International, 218(1), 494 – 507.
Petters, S.N (1982). Central West African cretaceous. Geology, 179,1-104.
Rahaman M.A (1988). Recent advance in study of basement complex of Nigeria. In: geological survey of Nigeria. (ed) Precambrian geology of Nigeria. Pp11-43.
Spector and Grant (1970). Statistical model for interpreting aeromagnetic data. Geophysics. Volume 35, pp 293-302.
United State Geological Survey USGS (1997). Introduction to potential field; Magnetics.
Vahid, T (2017). Depth of magnetic basement in Iran based on fractal spectral analysis of aeromagnetic data. Geophysical Journal International. 209, 1878 – 1891.
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