Qualitative and quantitative interpretations of aeromagnetic anomalies over Ogoja and Bansara areas of Anambra Basin, Lower Benue Trough of Nigeria were carried out using spectral analysis and source parameter imaging methods. The study area which covers an area of approximately 6050 km 2 lies within latitude 60° 0' to 7° 0' North and longitude 8° 30' to 9° 0' East. The regional anomaly was separated from the total magnetic intensity map to obtain the residual anomaly using first order polynomial fitting technique. The residual data was analyzed spectrally to obtain 18 spectral blocks for sedimentary depth estimates (deep and shallow depths). The edges and causative bodies of the residual anomaly were also sharpened to reduce anomaly complexity as well as fault trend amplification using first, second and horizontal derivatives. The 3-D basement topography map of the study area shows linear depression with deepest sedimentary thickness at the southeastern region of the study area, which implies that the feasibility of hydrocarbon potential will be higher in Bansara area than in Ogoja. The deepest depths obtained from spectral analysis and source parameter imaging are 5437.0 and 5059.9 m, respectively.
Aeromagnetic data over Abakaliki and Ugep areas of the lower Benue Trough were interpreted to determine the depth to magnetic source rocks of the area. The study area covered latitudes 5° 30' and 6° 30'N and longitudes 8° 00' and 8° 30'E with an estimated total area of about 6000 km 2 . Quantitative interpretation was carried out using spectral analysis method to compute for depth to basement while the polynomial fitting method was adopted for the regional-residual separation of the total magnetic intensity. Interpretation of the total magnetic intensity (TMI) over the area showed NE and NW main trends in the study area. The 3-D surface map also showed a linear depression with sedimentary accumulation trending E-W. The spectral analysis over the area showed a sedimentary thickness that ranged from 0.64 to 4.25 km. High sedimentary thickness of over 4 km was obtained at the central part of the study area while the minimum sedimentary thickness of about 0.60 km was obtained at the southern part of the study area which is around Ugep. The maximum sedimentary thickness of about 4.25 km could be capable of hydrocarbon accumulation prospect.
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