2-D Spectral Analysis of Aeromagnetic Anomalies over Parts of Bida Basin, Nigeria
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Date
2024-11-03
Journal Title
Journal ISSN
Volume Title
Publisher
Ilorin Journal of Science
Abstract
The average depth of magnetic sources was estimated in some portions of the Bida Basin. A 2-D spectral analysis of
aeromagnetic anomalies over six aeromagnetic map sheets, each spanning an area of ½° x ½° on a scale of 1:100,000,
was carried out. To identify residual features and draw attention to the more intense anomalies in comparison to the
strong regional gradients, data augmentation techniques were used. Adopted techniques include various filtering
approaches, trend surface analysis, and computations reducing to the equator. The result shows the two-depth source
model of the part of the basin with an average depth of the deeper magnetic sources at 3.26 km, which corresponded
to the magnetic basement surface. This layer may be associated with intra-basement characteristics including faults
and fractures, lateral changes in basement susceptibilities, and magnetic rocks found in the basement. There are
magnetic intrusive bodies within the sediments, as evidenced by the average depth of 1.22 km and a range of 0.68 km
to 2.32 km for the shallower magnetic sources. The magnetic source's average depth of 3.26 km to the basement
indicates a sufficient sedimentary thickness for potential hydrocarbon accumulation. The undulating nature of the
basement surface may create traps for hydrocarbons, suggesting that the possibility of hydrocarbon accumulation
cannot be ruled out.