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 km2. 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.
Key words: Aeromagnetic data, spectral analysis, magnetic anomaly, intrusions and sedimentary thickness.
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