Dispersion Patterns of Ground Roll (Seismic Noise) in Northern Niger Delta, Nigeria

Isaac, Aigbedion

doi:10.3923/jas.2007.175.181

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…This low-velocity layer affects the arrival times of recorded reflected seismic waves as well as the dispersion of seismic wave velocity. Furthermore, it generates ground roll noise with extremely high amplitude, masking useful reflected data (Aigbedion 2007;Akram and Al-Shuhail 2016) and producing fictitious structural features. 2.…”

Section: Prevailing Geoseismic Conditionsmentioning

confidence: 99%

RETRACTED ARTICLE: Improvement of seismic data quality and recognition of fault discontinuities through seismic data conditioning applications: a case study of Issaran oil field, Gulf of Suez, Egypt

Isaac

Ata

2022

J Petrol Explor Prod Technol

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Obtaining high-quality seismic imaging in shallow heterogeneous carbonate reservoirs with complicated structural regimes, such as the Issaran field, is difficult. Issaran field is a heavy oil shallow heterogeneous fractured carbonate reservoirs located in the Gulf of Suez of Egypt. It has many geological factors that affect image quality and pose numerous challenges. In addition, the seismic data was acquired more than 12 years ago, with narrow azimuth and short offsets. As a result, the fault zones are not sharply defined. Furthermore, the seismic data was processed about 10 years ago. The signal-to-noise ratio is relatively poor due to the random and coherent noises. A robust data conditioning workflow for noise suppression and fault discontinuity sharpening is used to improve the post-stack seismic data quality. In this context, a steering dataset was generated, and a dip-steered median filter (DSMF), a dip-steered diffusion filter, and a fault enhancement filter (FEF) were applied to sharpen the discontinuities. Structural attributes were evaluated, to investigate how the newly applied data conditioning affects the clarity of fault patterns. Furthermore, multiple physical attributes were extracted, including instantaneous phase, instantaneous frequency, and RMS amplitude to better understand the reservoir stratigraphic heterogeneity. The application of DSMF is useful in removing the residual random noises. The FEF-similarity attribute revealed small-scale faults with a 50-foot vertical throw. The physical attributes proved that the Issaran carbonate facies is controlled by structure. Moreover, the RMS amplitude attribute helped in distinguishing between porous and non-porous dolomite facies. As imaging quality has significantly improved, the applied seismic data conditioning workflow is beneficial for the field development in Issaran field. It is also suggested that this data conditioning workflow be applied in other heterogeneous carbonate reservoirs with complex structures around the world.

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Section: Prevailing Geoseismic Conditionsmentioning

confidence: 99%

RETRACTED ARTICLE: Improvement of seismic data quality and recognition of fault discontinuities through seismic data conditioning applications: a case study of Issaran oil field, Gulf of Suez, Egypt

Isaac

Ata

2022

J Petrol Explor Prod Technol

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“…In the Enugu coal mines in southeastern Nigeria, artisanal miners have been known to cut down large areas of forest for timber to support their mining activities. This has led to the loss of important wildlife habitats, as well as increased soil erosion and landslides (Aigbedion, 2007;Ogbonna et al, 2015;Omotehinse and Ako, 2019). It is unclear whether those who cut down the forests have been punished for their actions.…”

Section: Nigeriamentioning

confidence: 99%

Balancing environmental conservation and socioeconomic needs: the complexities of artisanal and small-scale coal mining in Africa

Kirsanov,

Mayorov,

Katyshev

et al. 2023

J. Degrade. Min. Land Manage.

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<p>Artisanal and small-scale coal mining (ASM) in Africa presents a complex challenge where environmental conservation and socioeconomic development must be carefully balanced. This article explores the intricate dynamics surrounding ASM in the African context, highlighting the multifaceted impacts on the environment and the socioeconomic well-being of local communities. Artisanal and small-scale coal mining is often characterized by low capital investment, limited mechanization, and dependence on manual labor. Despite this, miners face numerous problems due to the unstable socioeconomic situation and weak labor legislation. The article describes the practice of ASM in Africa: provides an overview of the growing significance of ASM in Africa, and sets the stage for understanding the intricate trade-offs faced in managing this sector. The development of ASM in Africa is examined, considering its historical context, drivers, and patterns of growth, emphasizing the need for context-specific approaches to address its complexities. The article delves into the environmental challenges posed by ASM, focusing on deforestation, land degradation, water and air pollution, and the loss of biodiversity. It examines the specific manifestations of these challenges in selected African countries, shedding light on the varied ecological consequences and their ramifications for sustainable development. Additionally, the socioeconomic dimensions of ASM are explored, acknowledging its potential as a livelihood source for many communities while also recognizing the social and economic vulnerabilities associated with it. The article discusses the interplay between ASM and local economies, including job creation, income generation, and the broader implications for poverty alleviation and sustainable development.</p><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script><script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"></script>

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“…The ever rising demands of most solid minerals compel miners to carry on with extraction even from deposits of lower grades hence causing environmental damage. Beyond the ecological, destruction of natural flora and fauna, pollution of land, air and water and radiation hazards; high rate of exploitation commonly lead to instability of soil and rock masses, landscape degradation (Aigbedion and Iyayi (2007). Particularly, rapid exploitation of mineral resources leads to partial or complete alteration of the original recognizable image of soil and landscape.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Kaolin Mineral Emplacement at Amaihe-Ukpor, Anambra Basin, Southeastern Nigeria Using Spatial Layer Electrical Resistivity Tomography

G.N.¹,

E.K.²,

U.E.³

2023

African Journal of Environment and Natural Science Research

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Spatial layer Resistivity tomography was carried out at a Kaolin Mining site in Amaihe-Ukpor of Anambra Basin, southeastern Nigeria. The tomograms were obtained at various depths with the aim of assessing the depths of emplacement of the Kaolin at the site. Firstly, apparent resistivity data Schlumberger-B electrode configuration was obtained from Seventy-five (75) Vertical Electrical Tomography (VES) along 6 transverses at the site. Using the VES data, tomographic plots of spatial distribution of the Kaolin minerals at depths were obtained. Interpreted tomograms showed the occurrence of Kaolin minerals bearing apparent resistivity values in the range of about (900 - 28,900 Ωm) occurrence within the depth range of 0.5 m at layer 2 to 115 m at layer 4 of the site. The tomograms show that layers 2 to 5 indicate traces of the occurrence of Kaolin, layers 2, 3 and 4 particularly showed prominence of the Kaolin. Layers 1 and 6 show no trace of the Kaolin formation enrichment on them. The spatial layer tomograms showed that the prominence of the Kaolin remains at the site occur mostly at the northern and southern zones of the surveyed site. Further mining at the site could lead to tertiary exploitation of the mineral. The site is therefore in threat of gross depletion of the environment. Hence, there is need for suspension of the ongoing extraction of the Kaolin at the site to give room for deposition and sufficient formation of the target mineral.

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Dispersion Patterns of Ground Roll (Seismic Noise) in Northern Niger Delta, Nigeria

Cited by 5 publications

References 6 publications

RETRACTED ARTICLE: Improvement of seismic data quality and recognition of fault discontinuities through seismic data conditioning applications: a case study of Issaran oil field, Gulf of Suez, Egypt

RETRACTED ARTICLE: Improvement of seismic data quality and recognition of fault discontinuities through seismic data conditioning applications: a case study of Issaran oil field, Gulf of Suez, Egypt

Balancing environmental conservation and socioeconomic needs: the complexities of artisanal and small-scale coal mining in Africa

Evaluation of Kaolin Mineral Emplacement at Amaihe-Ukpor, Anambra Basin, Southeastern Nigeria Using Spatial Layer Electrical Resistivity Tomography

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