Aeromagnetic Investigation of the Subsurface Sturctures in Parts of Niger Delta, Nigeria

The geophysical interpretation of Aeromagnetic data over the study area bounded by longitude 4°00′–5°00′ and latitude 5°30′–6°30′ provides crucial insights into the subsurface geological configuration, with significant implications for hydrocarbon exploration. Reduced-to-Equator (RTE) map reveals magnetic values ranging from 32,869.16 nT to 33,037 nT, reflecting the influence of subsurface lithology and tectonic structures. High magnetic intensities in the East–central and South Western part of the map, often correlate with the presence of ferromagnetic minerals, such as magnetite-rich mafic and ultramafic rocks, suggesting potential igneous intrusions or lithological boundaries, the lower magnetic zones, illustrated in blue west–central part of the map, indicate nonmagnetic sedimentary units, deep basement rocks, or zones of weathering and alteration. The high magnetic intensity closures observed within the basin are likely associated with the underlying basement rocks or with igneous intrusions that may have penetrated the sedimentary sequence. Depth estimation techniques such as Euler Deconvolution utilize a structural index (SI = 1) to delineate linear geological features like faults and dykes, with clustered solutions indicating complex basement architecture. Source Parameter Imaging (SPI) analysis estimates source depths exceeding 3.0 km, confirming the presence of thick sedimentary basins critical for hydrocarbon maturation. Spectral analysis indicates basement depths between 8.7 and 11.6 km, with deeper zones concentrated centrally and southeast part , aligning with potential depocenters. The First Vertical Derivative (FVD) map indicates the passage of the paleo-fracture zone through the area. This is also indicated in the discontinuity shown in the Total Magnetic Intensity (TMI) map. These datasets improve the geological interpretation of the region, reveal structurally controlled sedimentary basins, and help outline prospective zones for hydrocarbon exploration and development within the Niger Delta.

Aeromagnetic survey, Paleo-fracture zone, Total Magnetic Intensity

1. Adebayo, O., & Eze, C. (2021). Application of aeromagnetic data in delineating structural features of the Niger Delta Basin. Journal of African Earth Sciences, 179, 104028. [Google Scholar] [Crossref]

2. Doust H. & Omatsola, E. (1990). Niger Delta In: Edwards, J.D. and Santogrossi, P.A., eds., Divergent/Passive Margin Basins, AAPG Memoir 48, American Association of Petroleum Geologists, Tulsa, 239-248, 1990. [Google Scholar] [Crossref]

3. Durojaiye, O., & Ogundipe, E. (2021). Subsurface structures of the Niger Delta: Insights from aeromagnetic data analysis. Geophysics, 86(1), 23-35. [Google Scholar] [Crossref]

4. Evamy B.D., Haremboure, J. Kamerling, Knaap, P. W.A. Molly F.A. & Rowlands P.H. (1978). Hydrocarbon Habitat of the Tertiary Niger Delta, American Association of Petroleum Geologists, Bulletin, 62, 277-298. [Google Scholar] [Crossref]

5. Lawal, S. & Ojo, K. (2022). Magnetic signature analysis of the Niger Delta Basin using high-resolution aeromagnetic data. Frontiers in Earth Science, 10, 1568232. [Google Scholar] [Crossref]

6. Olayinka, L. A. (1989). Review of the stratigraphy, sedimentation and structure of Niger Delta. Ibadan: Rock and Stone Ltd. In Kogbe, C. A. (1989). Geology of Nigeria 2nd ed., 311 – 323. Jos: Rock View Nigeria Ltd. [Google Scholar] [Crossref]

7. Reijers, T.J.A. (2011). Stratigraphy and Sedimentology of the Niger Delta, Geologos, 17 (3), 133-162. [Google Scholar] [Crossref]

8. Stacher, P. (1995). Present understanding of the Niger Delta Hydrocarbon Habitat. In: Oti, M. N. and Postma, G., eds., Geology of Deltas, Rotterdam, A.A. Bakema. [Google Scholar] [Crossref]

9. Telford, W.M., Geldart, L, P., & Sherrif, R. E. (1990). Applied Geophysics (2nd ed.).New York: Cambridge University Press. 770 pages [Google Scholar] [Crossref]

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