Global Conference on Nanomedicine, Nanobiology, Nanotechnology & Pharmacology
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Accepted Abstracts

Forward and Inverse Modeling and Spectral Analysis of Guzabure and Gudumbali regions, Chad Basin, North Eastern Nigeria, using High Resolution Aeromagnetic data

Ngozi Agatha Okwesili*, Johnson Cletus Ibuot, Daniel Nnaemeka Obiora
University of Nigeria, Nigeria

Citation: Okwesili NA, Ibuot JC, Obiora DN (2019) Forward and Inverse Modeling and Spectral Analysis of Guzabure and Gudumbali regions, Chad Basin, North Eastern Nigeria, using  High Resolution Aeromagnetic data. SciTech Nanosciences-Pharma 2019. Tokyo: Japan

Received: June 24, 2019         Accepted: June 27, 2019         Published: June 27, 2019

Abstract

High resolution aeromagnetic data of Guzabure and Gudumbali areas have been interpreted qualitatively and quantitatively. The qualitative interpretation showed that the study area is magnetically heterogeneous. It also revealed from the occurrence of subsurface linear structures, the presence of faults in the study area. Quantitative interpretation was carried out by forward and inverse modeling and source parameter imaging methods. The anomalies over the area were modeled by bodies in the form of ellipsoid, rectangular prism and sphere by varying the total magnetic intensity parameters. Depth obtained by model 1 is 1887 m with susceptibility value of 0.0151 signifying marble/granite. The depth of model 2 is 858 m signifying an outcrop with susceptibility value of -0.010 signifying shale. Depth obtained for models 3, 4, 5, 6 and 7 are , 1199, 1820, 2968, 1290 and 3198 m. respectively, with respective susceptibility values of  0.0385, 0.0170, 0.0003, -0.0001 and 0.0002 SI signifying granite/marble, sandstone, limestone, kaoline and clay. The depth from spectral analysis shows that the depth to the magnetically deep sources ranges from 1.8 to 4.1 km while the depth to the shallow sources ranges from 0.36 to 1.11 km. The deep depth to basement is shallowest (purple colour) in the Gudumbali part of the study area, while it is deepest (blue colour) in Guzabure area. Maximum depth obtained by forward and inverse modeling is 3198m while that obtained by spectral analysis is 4056m. The results obtained from aeromagnetic forward and inverse modeling closely agrees with that of the spectral analysis method.
 
Key words:  High resolution aeromagnetic data, Spectral Analysis, Forward and inverse modelling, Gudumbali, Guzabure.