GEOPHYSICAL INVESTIGATION OF THE UPPER BENUE TROUGH IN NORTHEAST NIGERRIA THROUGH AEROMAGNETIC DATA.
Abstract: This research presents the findings of an analysis and interpretation of aeromagnetic data conducted over a section of the Adamawa trough, with the primary objective of investigating the hydrocarbon potential of the region. The study area spans 12,000 km2 and is situated between latitudes 8.50oN and 9.50oN, and longitudes 11.50oE and 12.50oE.
Both qualitative and quantitative analyses were employed to identify deep-seated anomalies and estimate the sedimentary thickness for hydrocarbon maturation and accumulation. The identification of deep-seated structures was achieved using upward continuation and analytic signal techniques based on the total magnetic intensity map. To determine sediment thickness, three depth estimating techniques were utilized: Source parameter imaging, Euler deconvolution, and spectral method.
The analytic signal analysis revealed two major regions: the first consisted of areas with high amplitude responses, indicating basement intrusions with varying degrees of deformations in the south-eastern to central parts of the study area; the second comprised regions with low amplitude, indicating relatively favorable sedimentation conditions in the northern part.
Subsequently, the residual map was subjected to the depth estimating techniques, which yielded consistent results. The north-eastern part of the study area showed a thick sedimentary layer of 4.42 km, 4.20 km, and 4.17 km, as determined by the SPI, Euler deconvolution, and spectral method, respectively. In contrast, the south-eastern and southwest parts exhibited shallower depths of 0.06 km, 0.10 km, and 0.42 km using the same techniques.
Notably, the maximum sedimentary thickness of over 4 km, observed in the north-eastern part corresponding to Numal, appears sufficient for hydrocarbon maturation and accumulation. Based on these findings, the study area exhibits promising prospects for hydrocarbon exploration.
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