Analysis of aeromagnetic anomalies and structural lineaments for mineral and hydrocarbon exploration in Ikom and its environs southeastern Nigeria

Innocent, Arinze J.; Emedo, Chidubem Okwudiri; Chibuzor, Ngwaka A.

doi:10.1016/j.jafrearsci.2018.12.011

Cited by 18 publications

(3 citation statements)

References 22 publications

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“…What really needs to be inversed is the mineralization-targeted or residual anomalies after removing the regional (background) anomalies and the neighboring interferences. There are some filtering techniques that have been applied to deal with this regional-residual separation issue, such as graphical separation (Gupta and Ramani, 1980), radial power spectrum analysis (Zahra and Nakhla, 2016;Elkhateeb and Abdellatif, 2018), match filter (Spector and Grant, 1970), preferential filtering method (Guo et al, 2013), polynomial fitting (Martínez-Moreno et al, 2015;Gabtni and Jallouli, 2017;Innocent et al, 2019), fast Fourier transform (Saada et al, 2022), and upward continuation (Eldosouky et al, 2022). However, there are no unique and absolute solutions for regional-residual anomaly separation.…”

Section: Introductionmentioning

confidence: 99%

An aeromagnetic denoising-decomposition-3D inversion approach for mineral exploration

Xiu

Gao

et al. 2023

Front. Earth Sci.

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Reduction of aeromagnetic noise and extraction of mineralization-related residual anomalies are critical for aeromagnetic data processing in mineral exploration. This study introduced a multifractal singular value decomposition (MSVD) method to remove the noise and improved the bi-dimensional empirical mode decomposition (BEMD) algorithm to extract residual magnetic anomalies. It is shown that MSVD and improved BEMD could effectively reduce the noise and extract residual magnetic anomalies. Then, a wavenumber–domain iterative approach is applied in 3D imaging of magnetic anomalies and gradients with depth constraints, which is a rapid tool for qualitative and quantitative interpretation of magnetic data and is suitable for rapidly imaging large-scale data. The 3D inversion result is verified by four geological sections along the regional tectonic directions and some drilling holes on the deposits. It is revealed that this proposed approach is practical and effective in dealing with aeromagnetic data interpretation and inversion for mineral exploration.

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Section: Introductionmentioning

confidence: 99%

An aeromagnetic denoising-decomposition-3D inversion approach for mineral exploration

Xiu

Gao

et al. 2023

Front. Earth Sci.

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“…The magnetic method uses the magnetization contrasts between different lithologies to examine environmental or geologic subsurface problems of various kinds. These problems include mineral and ore detection (Innocent et al, 2019;Shah et al 2020;Mehanee et al 2021), hydrocarbon exploration (Al-Farhan et al 2019;Osinowo and Taiwo 2020), archaeological investigation (Powell et al 2012;Pisz et al 2020), geotechnical engineering (Hasan et al 2020; Igwe and Umbugadu 2020), cave discovery (Mochales et al 2008;Orfanos and Apostolopoulos 2012) and geothermal exploration (Abdel Zaher et al 2018;Abraham and Alile 2019;Zhao et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Magnetic anomaly interpretation for a 2D fault-like geologic structures utilizing the global particle swarm method

Essa

Géraud

Reid

2021

Preprint

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We establish a method to elucidate the magnetic anomaly due to 2D fault structures, with an evaluation of first moving average residual anomalies utilizing filters of increasing window lengths. After that, the buried fault parameters are estimated using the global particle swarm method. The goodness of fit among the observed and the calculated models is expressed as the root mean squared (RMS) error. The importance of studying and delineating the fault parameters, which include the amplitude factor, the depth to the upper edge, the depth to the lower edge, the fault dip angle, and the position of the origin of the fault, is: (i) solving many problem-related engineering and environmental applications, (ii) describing the accompanying mineralized zones with faults, (iii) describing geological deformation events, (iv) monitoring the subsurface shear zones, (v) defining the environmental effects of the faults before organizing any investments, and (vi) imaging subsurface faults for different scientific studies. Finally, we show the method applied to two theoretical models including the influence of the regional background and the multi-fault effect and to real field examples from Australia and Turkey. Available geologic and geophysical information corroborates our interpretations.

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“…The aeromagnetic method is focused primarily on the measurement of the magnetic effect created by differing concentrations of ferromagnetic materials, such as magnetite, in geological structures, which is used to extract information relating to direction, the gradient of magnetization, or the Earth's magnetic field intensity [1]. The total magnetic field and or the vertical gradient is usually measured.…”

Section: Introductionmentioning

confidence: 99%

Analysis of aeromagnetic filtering techniques in locating the primary target in sedimentary terrain: A review

2021

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This article analyzes some aeromagnetic filtering techniques for mitigating deceptive geophysical conceptions that may result in a distorted range of geological information from aeromagnetic data. The implication of using the aeromagnetic method, data processing, and enhancement to distinguish sediment-produced anomalies was considered. Two methods to locate buried faults in aeromagnetic data were compared: Edge and fault detection were considered using the magnetic contrast and horizontal gradient methods, whereas rapid depth estimation was considered using the Euler deconvolution method and Signum method. The general challenge to find the magnetic anomaly depth and delineate edges relies on geophysical filtering techniques discussed in order to maintain its geological relevance. The magnetic-contrast layer model signatures help clarify the existence of intra-sedimentary faults. The horizontal gradient approach relative to other derivative methods has better noise stability and fast adaptation to grids without modifying parameters. However, the Signum transform (ST) approach offers a more special solution in depth estimation than the Euler’s deconvolution approach whose solution relies on the required choice of default shape parameters and windows. The Euler deconvolution procedure may not be able to detect structures found by the ST approach and vice versa. As a result, these techniques may be used in conjunction with one another during analysis, as complementary interpretation tools. This review will however aid in the analysis of information used as a criterion for determining faults using various analytical techniques like ST or Euler deconvolution.

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Analysis of aeromagnetic anomalies and structural lineaments for mineral and hydrocarbon exploration in Ikom and its environs southeastern Nigeria

Cited by 18 publications

References 22 publications

An aeromagnetic denoising-decomposition-3D inversion approach for mineral exploration

An aeromagnetic denoising-decomposition-3D inversion approach for mineral exploration

Magnetic anomaly interpretation for a 2D fault-like geologic structures utilizing the global particle swarm method

Analysis of aeromagnetic filtering techniques in locating the primary target in sedimentary terrain: A review

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