Browsing by Author "Lawal, T. O"

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    Estimation of Sedimentary Thickness of Maiduguri, Northeastern Nigeria, from Fourier Analysis of Aeromagnetic Data
    (2016) Nwankwo, LI; Sunday, J. A; Lawal, T. O; Ige, S. O; Shehu, A. T
    A quantitative interpretation of the aeromagnetic anomalies of Maiduguri (Sheet 90) in the north-eastern region of Nigeria has been carried out using Fourier transform method. The study arear covers approximately 3,025 square Kilometers and forms part of Chard Basin. Regional anomalies were removed from the total magnetic field using 2D least method and the resulting residual data were used to obtain Fourier Spectra of 20 selected profiles. Slopes of high and low frequency portions of each spectrum were utilized to estimate depths to shallow and deeper magnetic sources. The results show that the depths to shallow and deeper magnetic sources vary from 0.30 to 0.84 km with an average of 0.42 km and from 0.85 to 3.27 km with an average of 1.59 km respectively. Depths to deeper magnetic sources are normally inferred as sedimentary thickness; therefore the results indicate that the estimated thickness of sedimentary fill in Maiduguri area of Chad basin ranges between 0.85 and 3.27 km
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    Wavelet Analysis of High Resolution Aeromagnetic (HRAM) Data over Part of Chad Basin, Nigeria
    (Faculty of Physical Sciences, University of Ilorin, 2014-08-23) Lawal, T. O; Nwankwo, L. I
    A High Resolution Aeromagnetic Data over part of Chad basin, Nigeria has been analyzed and interpreted with the objective of identifying the nature of magnetic source geometries responsible for hydrocarbon proceptivity using wavelet transformation technique. The technique was chosen because of the inability of Fourier transform to interpret location of features from the transform coefficients. In this work, wavelet transform coefficients were obtained using Morlet mother wavelet. The Scalogram was computed from the transform coefficients which reveal various magnetic source geometries. In other to identify the nature and location of sources geometries, a scale normalization factor was introduced on the wavelet coefficient which increases the resolution of various magnetic sources in the Scalogram plots. The result obtained from the analysis has revealed various magnetic source geometries which are important in hydrocarbon proceptivity in Chad basin, Nigeria.