Subsurface Structural Investigation for Evaluation of Hydrocarbon Potential Using Aeromagnetic Data Over Parts Of Southeastern Nigeria.
- July 13, 2021
- Posted by: rsispostadmin
- Categories: Geophysics, IJRIAS
International Journal of Research and Innovation in Applied Science (IJRIAS) | Volume VI, Issue VI, June 2021|ISSN 2454-6194
Nwokeabia, Charity Nkiru1, Ibe, Kalu Kalu2, Ibeneme, Sabinus Ikechukwu3, Orji, Chikwendu Emenike4, Adikwu, Stephen Onum5, Iduma Uche6
1 Department of Applied Geophysics, Nnamdi Azikwe University Awka, Nigeria
2,3,4,5 Department of Geology, Federal University of Technology Owerri, Nigeria
6Kelma Geodynamic Limited Abuja, Nigeria
Abstract: Airborne magnetic dataset Studies were carried out in parts of Southeastern Nigeria. Airborne magnetic data covering the study area was acquired, processed, and interpreted with the aim of determining the depth to basement of for hydrocarbon potential in the study area. Various data enhancement techniques such as reduction to equator, Analytica Signal, First Vertical Derivative (FVD), upward continuation and 3D euler deconvolution were carried out on the magnetic data in order to filter unwanted signals. Analysis such as sediment thickness was evaluated using the Extended Euler Depth solution. Sediment thickness within the southern Benue Trough ranges from 151.1 to 1297.4 m. Afikpo Basin has sediment thickness ranging from 513.9 to >3469.6 m, while Anambra Basin has sediment thickness ranging from 228.4 to >3469.6 m. the thickest sedimentary unit within the Afikpo Basin is geographically located around Bende, Iduma, Ohafia, Okigwe, Abiriba, Uzuakolo and Amaeke, while that of the Anambra Basin is geographically located around Aka Ihobe, Orumba, OwereEzukala, Mbala, Agwu, Isuochi, Akwa, Umuawulu, Ezeagu, Onuba, Agbani and AbawaOgugu. Niger Delta Basin has the high sediment thickness with range of 3469.6 to 6760 m, with the thickest sediment geographically located around Omodema, Abara, Omoecheigbo, Etche, Imogwa, Okoroagu.
Airborne Magnetic, Enhancement technique,sediment, Southeastern Nigeria.
1.1 Introduction
Aeromagnetic survey is one of the most frequently used type airborne geophysical survey and has been recognized as a principal mapping tool for materials that are strongly magnetized (Murphy, 2007). The essence of the magnetic survey is to investigate subsurface geology on the basis of the anomalies in the earth’s magnetic field resulting from the magnetic properties of the underlying rocks. The physical principle of aeromagnetic method is based on taking the ambient magnetic susceptibility of the subsurface geology and using the data to determine the distribution of the magnetic minerals and hence changes in the lithology (Telford et al., 1990). The susceptibility (magnetic content) is dependent on the type of rock and its environment (Mariita, 2013). Soil magnetic susceptibility can be related to different terrain topography attributes such as the slope, elevation and concavity – convexity of the surface terrain to explain the distribution of magnetic minerals within soil (Appiah, 2015).
The aim is to interpret the study area using high resolution aeromagnetic data in order to estimate the sedimentary thickness of the study area.
