Multi-Step Filtering of High Resolution Aeromagnetic Data for Geological Delineation over Sokoto Basin, Northern Nigeria
DOI:
https://doi.org/10.56919/usci.2542.013Keywords:
Multi-Step Filter, Magnetic field intensity, Sokoto BasinAbstract
Study’s Excerpt:
• Aeromagnetic survey helped detect subsurface structures via magnetic susceptibility contrasts.
• Data over Sokoto Basin were processed with filters to map geological boundaries effectively.
• A 0.5° × 0.5° grid was used to create a composite map of total magnetic field intensity.
• Four filters, RTE, Butterworth, VI, and UC, enhanced regional magnetic features in sequence.
• Filtering revealed four magnetic zones linked to known formations, resolving hidden structures.
Full Abstract:
The aeromagnetic survey provides a means for prospecting subsurface structures based on the magnetic susceptibility contrast of the underlying materials. It is applied in hydrocarbon study, mineral exploration, environmental monitoring, unexploded ordinance, and geological mapping. In this research, high-resolution airborne magnetic data over Sokoto Basin were acquired, analysed, and interpreted using some selected filters applied in steps to delineate the geologic boundary of the study area. The data, which were acquired in the form of 0.5⁰ × 0.5⁰ square grids, were first knitted to form the composite total magnetic field intensity map of the study area. A hierarchical combination of four carefully selected enhancement filters was then applied to the composite total magnetic field intensity map to enhance regional features. The filters were reduction to the equator, Butterworth, vertical integration, and upward continuation – the algorithms are available in the Oasis Montaj environment. The results obtained showed four distinct regional fields – very high (>100 nT) at the northern part corresponding to the Sokoto Group, high (60-100 nT) at the north-western part corresponding to the Gwandu Formation, moderate (40-50 nT) at the mid part indicting the Rima Group and low (< 40 nT) in the south-eastern part of the area resulting from Continental Intercalaire. It is concluded that the multi-step filter has reasonably delineated the stratigraphic successions in the Nigerian sector of the lullummeden Basin (Sokoto Basin). The filtering was efficacious in resolving the geologic structures, which were not resolved when a single technique was applied in isolation.
References
Anudu, G. K., Stephen, R. A. and Macdonald, D. I. M. (2014). Using High-Resolution Aeromagnetic Data to Recognise and Map Intra-Sedimentary Volcanic Rocks and Geological Structures across the Cretaceous Middle Benue Trough, Nigeria. Journal of African Earth Science, 99, 625-636. https://doi.org/10.1016/j.jafrearsci.2014.02.017
Ezekiel, K. Benjamin, O. O. Simon, K. Ayodele, O. O. Ahmad, N. (2019). Determination of Hydrocarbon Potentials Using High Resolution Aeromagnetic Data over Sokoto Basin Northwestern Nigeria, International Journal of Geosciences, 10, 419-438. https://doi.org/10.4236/ijg.2019.104024
GETECH Group (2007). Processing and Interpretation of Gravity and Magnetic Data. Advanced Processing and Interpretation, GETECH Group Plc. Pp 27.
Ibe S. O., Uche Iduma. (2018). Structural Interpretation of Northern Sokoto Basin, Using Airborne Magnetic Data, International Journal of Innovative Research in Science, Engineering and Technology, 6, 112-119.
Kamba, A. H., Muhammad, S. and Illo, A. G. (2018). Basement Depth Estimates of some part of Lower Sokoto Sedimentary Basin, North-western Nigeria, Using Spectral Depth Analysis, International Journal of Marine, Atmospheric & Earth Sciences, 6(1), 1-9.
Lawal, S, Salako, K. A. and Bonde, D. S. (2020). Delineation of Mineral Potential Zones over Lower Sokoto Basin, Northwestern Nigeria using Aeromagnetic Data. Academic Research International, 11(2), 9-29.
Obaje, N., Wehner, H., Scheeder, G., Abubakar, M. and Jauro, A. (2004). Hydrocarbon Prospectivity of Nigeria's Inland Basins: from the Viewpoint of Organic Geochemistry and Organic Petrology. AAPG Bulletin, 88(3), 325-353. https://doi.org/10.1306/10210303022
Obaje, N. G. (2009). Geology and Mineral Resources of Nigeria. Springer, Heildelberg, pp 221. https://doi.org/10.1007/978-3-540-92685-6
Obaje, N. G., Aduku, M. and and Yusuf, I. (2013). The Sokoto Basin of Nigeria: A Preliminary Assessment of the Hydrocarbon Prospectivity. Petroleum Technology Development Journal (ISSN 1595-9104), 3(2), 66-80.
Ozumba, M. B. (2018). Potential Reservoir Rock Characteristics Of The Sokoto Sector of Illemmeden Basin: Geological Similarities with the Niger Delta Petroleum Province And Prospects For Hygrocarbon Discovery. Arch Pet Environ Biotechnol, 132, 2574-7614.
Rabo, Y., Bello, A. and Abubakar, I. (2022a). Estimation of Basement Depth of Eastern Part of Sokoto Sedimentary Basin, Northwestern Nigeria. Science Journal of Advanced and Cognitive Research, 2(1), 22-32.
Rabo, Y., Bonde, D. S., Bello, A. and Usman, A. (2022b). Geophysical Investigation for Mineral Prospecting of Some Parts of Eastern Sokoto Sedimentary Basin, Nigeria. Saudi Journal of Engineering Technology, 2(1), 22-32.
Sheu, A. T., Udensi, E. E. Adeniyi, J. O. and Jonah, S. A. (2004). Spectral Analysis of the Magnetic Residual Anomalies over the Upper Sokoto Basin, Nigeria. Zuma Journal of Pure and Applied Science, 6, 213-219.
Shehu, A. T., 2Nwankwo, L. I. and 3Salako, K. A. (2017). The Source Parameter Imaging (SPI) method for estimation of depth to buried magnetic sources from gridded digital data of the Sokoto Basin, Nigeria: Implications in exploration Geophysics. Zimbabwe Journal of Science & Technology pp 66–74.
Telford, W. M., Geldart, L. P., and Sheriff, R. E. (2004). Applied Geophysics. 2nd ed. Cambridge University Press, Pitt Building, Trumpington Street, Cambridge CB2 IRP.
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Copyright (c) 2025 Sabiu Bala Muhammad, Nordiana Muhd Muztaza, Saidu, A., Abdulkadir, M., Abubakar, S., Mohammed, M. A.
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