APPLICATION OF AEROMAGNETIC AND LANDSAT-ETM DATAIN THE STRUCTURAL ANALYSIS OF PART OF THE MIDDLE BENUE TROUGH

AUTHOR: ODUMOSU, GABRIEL EKUNDAYO (MSc)

DEPARTMENT: Geology

SCHOOL: School of Physical Sciences (SOPS)

AFFILIATION: Federal University of Technology Owerri

Recent quests for increased hydrocarbon potentials have necessitated further geological enquiries into the Middle Benue Trough. Structural and tectonic interpretations over the Middle Benue Trough were carried out using aeromagnetic and Landsat data to delineate the structural features of the study area and to assess their significance to hydrocarbon and mineral potentials of the area. Several analytical techniques were employed in the aeromagnetic and Landsat data. Analytical techniques used for the aeromagnetic  data include the regional/ residual separation, second vertical derivative, spectral analysis and the Euler deconvolution. Similarly, image restoration and enhancement techniques were carried out on the Landsat ETM data using ILWIS 3.1 Academic. Several lineaments with dominant trends of NE-SW and NW-SE directions were revealed in the study area. Results of the 2-D spectral analysis of the aeromagnetic data revealed a two depth source model. The depth to the deeper magnetic source bodies range in depth from 2.1km to 5.5km with an average depth of 4.1km. This layer may be attributed to magnetic rocks of the basement, lateral variations in basement susceptibilities and intra- basement features like faults and fractures. The shallower magnetic sources ranging in depth from 0.1km to 1.2km with an average depth of 0.7km could be attributed to near surface magnetic sources, which are magnetic rocks which intruded into the sedimentary formations. Depth evaluation from Euler deconvolution methods also indicated the presence of contacts all over the study area. The Euler deconvolution analysis revealed that contacts were observed at depths ranging from 500m to 3000m while dykes and sills were also observed at depths ranging from 500m to 3000m. Results show that the average sediment thickness of 4.1km and structural indications such as faults obtained in the study area are significant for the generation, accumulation and entrapment of hydrocarbons.

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