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.
Highlights
Aeromagnetic survey is a kind of geophysical prospecting which makes use of airborne geophysical surveying instruments installed in an aircraft at a certain flight height range to acquire magnetic field strength from the subsurface
Previous studies were carried out in the study area in order to determine the basement depth. Such works includes that of Olawale and Yusuf (2019) who applied Euler Deconvolution for basement configuration and lineament mapping from aeromagnetic data of Gongola arm of upper Benue trough, North-eastern Nigeria
The result obtained by Olawale and Yusuf shows that the basement depth in the study area is 5 km below the surface; Muhammad et al, (2014) applied Stanley method to evaluate magnetic basement depth over Bajoga and environs
Summary
Aeromagnetic survey is a kind of geophysical prospecting which makes use of airborne geophysical surveying instruments installed in an aircraft at a certain flight height range to acquire magnetic field strength from the subsurface. Previous studies were carried out in the study area in order to determine the basement depth Such works includes that of Olawale and Yusuf (2019) who applied Euler Deconvolution for basement configuration and lineament mapping from aeromagnetic data of Gongola arm of upper Benue trough, North-eastern Nigeria. The result from the analysis using Stanley method shows that the depth of 2.4 km, 2.23 km, 0.9 km and 1.6 km for profile AA’,BB’,CC’ and DD’ respectively; While Abubakar et al, (2010) applied spectral analysis for the evaluation of Gongola Basin upper Benue trough, North-eastern Nigeria. The basement complex within the study area includes; The Migmatites – Gneiss Complex which is generally considered as the basement complex (Rahaman, 1988), and it is the most widespread of the component units in the Nigerian basement It has a heterogeneous assemblage comprising migmatites, orthogenesis, paragneisses, and a series of basic and ultra basic metamorphosed rocks.
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