Estimation of Sedimentary Thickness of Parts of Upper Benue Trough, Nigeria, using Integrated High Resolution Aeromagnetic and GRACE data

نوع مقاله : مقاله پژوهشی

نویسندگان

1 Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria.

2 Federal University of Technology Akure, Ondo State, Nigeria.

3 Department of Industrial Physics Enugu State University of Science and Technology, Enugu State, Nigeria.

4 Federal University of Allied Health Sciences, Enugu State, Nigeria.

چکیده

High-resolution aeromagnetic and gravity data from the Gravity Recovery and Climate Experiment (GRACE) were analyzed to evaluate the sedimentary thickness and hydrocarbon potential of parts of the Upper Benue Trough in Nigeria. The study area is bounded by latitudes 9.0° to 10.0° North and longitudes 10.0° to 12.5° East, and covers approximately 30,250 km². Total Magnetic Intensity (TMI) and Bouguer gravity anomaly grids were generated using Oasis Montaj 8.4 software and subjected to polynomial fitting for regional–residual separation and qualitative interpretation. The magnetic and gravity fields exhibit similar regional trends, indicating that both deep and shallow sources are influenced by a common tectonic framework. Quantitative analysis using Source Parameter Imaging (SPI) and Euler deconvolution was performed to estimate the sedimentary thickness of the area. The magnetic and gravity SPI depth results ranged from -207.4 to -3523.0 m and -115.7 to -3767.3 m, respectively. The magnetic Euler depth values varied between 413.3 m and -3597.5 m, while gravity Euler depths ranged from 600.6 to -3606.4 m. The unconventional appearance of the gravity SPI and Euler depth maps is attributed to the coarse resolution and long-wavelength nature of satellite gravity data compared to the high resolution, near-surface sensitivity of aeromagnetic data. The maximum sedimentary thickness of -3767.3 m indicates adequate sediment accumulation for hydrocarbon generation. Areas such as Bashar, Yuli, Futuk, Dong, and Guyok are characterized by low gravity and magnetic anomalies with relatively deep basement depths, signifying zones of enhanced sedimentary deposition that are favorable for hydrocarbon entrapment.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Estimation of Sedimentary Thickness of Parts of Upper Benue Trough, Nigeria, using Integrated High Resolution Aeromagnetic and GRACE data

نویسندگان [English]

  • J. Uchenna Abangwu 1
  • Oliver U. Ekwueme 2
  • Ngozi A. Okwesili 1
  • Desmond O. Ugbor 1
  • Emmanuel A. Igwe 1
  • Anthonia N. Nwobodo 3
  • Maximus C. Ugwuanyi 4
1 Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria.
2 Federal University of Technology Akure, Ondo State, Nigeria.
3 Department of Industrial Physics Enugu State University of Science and Technology, Enugu State, Nigeria.
4 Federal University of Allied Health Sciences, Enugu State, Nigeria.
چکیده [English]

High-resolution aeromagnetic and gravity data from the Gravity Recovery and Climate Experiment (GRACE) were analyzed to evaluate the sedimentary thickness and hydrocarbon potential of parts of the Upper Benue Trough in Nigeria. The study area is bounded by latitudes 9.0° to 10.0° North and longitudes 10.0° to 12.5° East, and covers approximately 30,250 km². Total Magnetic Intensity (TMI) and Bouguer gravity anomaly grids were generated using Oasis Montaj 8.4 software and subjected to polynomial fitting for regional–residual separation and qualitative interpretation. The magnetic and gravity fields exhibit similar regional trends, indicating that both deep and shallow sources are influenced by a common tectonic framework. Quantitative analysis using Source Parameter Imaging (SPI) and Euler deconvolution was performed to estimate the sedimentary thickness of the area. The magnetic and gravity SPI depth results ranged from -207.4 to -3523.0 m and -115.7 to -3767.3 m, respectively. The magnetic Euler depth values varied between 413.3 m and -3597.5 m, while gravity Euler depths ranged from 600.6 to -3606.4 m. The unconventional appearance of the gravity SPI and Euler depth maps is attributed to the coarse resolution and long-wavelength nature of satellite gravity data compared to the high resolution, near-surface sensitivity of aeromagnetic data. The maximum sedimentary thickness of -3767.3 m indicates adequate sediment accumulation for hydrocarbon generation. Areas such as Bashar, Yuli, Futuk, Dong, and Guyok are characterized by low gravity and magnetic anomalies with relatively deep basement depths, signifying zones of enhanced sedimentary deposition that are favorable for hydrocarbon entrapment.

کلیدواژه‌ها [English]

  • Gravity and magnetic data
  • Source parameter imaging
  • Euler deconvolution
  • Hydrocarbon accumulation

مراجع

Abdulkadir, U., Hashim, J., Kumar, A., Yau, U., Simon, A., & Dawaki, A. (2021). 3D Seismic Data Design, Acquisition and Interpretation of Kolmani Exploratory Field, Upper Benue Trough, Gongola Basin; Nigeria. Society of Petroleum Engineers Nigeria Annual International Conference and Exhibition. doi: https://doi.org/10.2118/207118-MS
Abubakar, M. B., Dike, E. F. C., Obaje, N. G., Wehner, H., & Jauro, A. (2008). petroleum prospectivity of cretaceous formations in the Gongola basin, Upper Benue Trough, Nigeria: an organic geochemical perspective on a migrated oil controversy. Journal of Petroleum Geology, 31(4), 387–407. doi:10.1111/j.1747-5457.2008.00428.x
Ajala, S. A., Salako, K. A., Rafiu, A. A., Alahassan, U. D., Adewumi, T., & Sanusi, Y. A. (2021) Estimation of Sedimentary Thickness for Hydrocarbon Potential over part of Adamawa Trough, Nigeria using magnetic method. Earth Sciences Pakistan, 5(1), 07-11.
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Epuh, E. E., & Joshua, E. O. (2020). Modeling of porosity and permeability for hydrocarbon Exploration: A case study of Gongola arm of the Upper Benue Trough. Journal of African Earth Sciences, 162, 103646. https://doi.org/10.1016/j.jafrearsci.2019.103646.
Eke, P. O., Enyidah, M., & Ziriki, G. (2022). Airborne gravity data interpretation for subsurface structures and implications for hydrocarbon prospects in Kogi state, Nigeria. International Journal of Multidisciplinary Academic Research, 10(1), 52-64.
Obaje, N. G. (2009). Geology and mineral resources of Nigeria. Berlin: Springer Publishers 1–203.
Reid, A. B., Allsop, J. M., Grauser, H., Millet, A. J., & Somerton, I. N. (1990). Magnetic interpretation in three dimensions using Euler deconvolution. Geophysics, 55(1), 80-91.
Salako, K. A., & Udensi, E. E. (2013). Spectral depth analysis of parts of Upper Benue Trough and Borno Basin, North-East Nigeria, using aeromagnetic data. International Journal of Science and Research (IJSR), 2(8), 48-55.
Thompson, D. T. (1982). A new technique for making computer-assisted depth estimates from magnetic data. Geophysics, 47(1), 31-37.
Thurston, J. B. & Smith, R. S. (1997). Automatic conversion of magnetic data to depth, dip, and susceptibility contrast using the SPITM method. Geophysics, 62(3), 807-813.
Whitehead, N., & Musselman, C. (2008). Montaj Gravity/Magnetic Interpretation: Processing, Analysis and Visualization System for 3D Inversion of Potential Field Data for Oasis montaj v6.3, Geosoft Incorporated, 85 Richmond St. W., Toronto, Ontario, M5H 2C9, Canada.
Yakubu, J. A.; Okeke, F. N., & Obiora, D. N. (2020). Estimation of Curie point depth, geothermal gradient and heat flow within the lower Benue trough, Nigeria using high resolution aeromagnetic data. Modeling Earth Systems and Environment, 6(3), 1439-1449.
فیزیک زمین و فضا
دوره 51، شماره 4
تاریخ انتشار الکترونیکی: 26 اسفند 1404
اسفند 1404
صفحه 1-12

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