Evolution of porosity and pore geometry in the Permian Whitehill Formation of South Africa – A FE-SEM image analysis study

Chukwuma, Kenneth; Bordy, Emese M.; Coetzer, A.

doi:10.1016/j.marpetgeo.2017.12.026

Cited by 27 publications

(9 citation statements)

References 41 publications

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“…Our observations regarding the evolution of porosity generally agree with the findings of Chukwuma et al (2018), who, using high-resolution FE-SEM imaging combined with EDS analyses found that porosity positively correlates with the degree of SOM maturation in Whitehill shales. However, we draw attention to one of their findings which stipulates that a drastic decrease in porosity is observed in some rocks linked to thermal decarboxylation of organic matter, correlating with the infilling of pores by fibrous grains (including carbonates, clays, silicates, and phosphates) generated by re-precipitation of framework grains previously dissolved by organic acid-rich fluids.…”

Section: Petrography Organic Particle Morphology Diagenesis and Porositysupporting

confidence: 91%

“…Intra-crystalline, organic porosity (e.g. Schieber et al, 2010;Chukwuma et al, 2018) has a much higher contribution to the rock porosity. Here, the inter-crystalline porosity is much lower compared to the KZF-1 shales, and, by contrast, the organic porosity, with a high degree of interconnectivity, controls the effective porosity of the rock.…”

Section: Petrography Organic Particle Morphology Diagenesis and Porositymentioning

confidence: 99%

“…In this context, the palynofacies of the different black shales provided vital information on the sedimentary environments in which the potential source rocks formed . The evolution of porosity and pore geometry in the Whitehill Formation was studied by Chukwuma et al (2018) using a highresolution field emission electron microscope. The authors found a commonly reported strong positive covariation of porosity and total organic carbon content (TOC) in all their samples.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sedimentary organic matter characterization of the Whitehill shales (Karoo Basin, South Africa): An integrated quantitative approach using FE-EPMA and LA-ICP-MS

Costin

Götz

Ruckwied³

2019

Review of Palaeobotany and Palynology

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Section: Petrography Organic Particle Morphology Diagenesis and Porositysupporting

confidence: 91%

Section: Petrography Organic Particle Morphology Diagenesis and Porositymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sedimentary organic matter characterization of the Whitehill shales (Karoo Basin, South Africa): An integrated quantitative approach using FE-EPMA and LA-ICP-MS

Costin

Götz

Ruckwied³

2019

Review of Palaeobotany and Palynology

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“…The samples were then coated with iridium and examined using field-emission scanning electron microscopy with an X-ray energy-dispersive detector (FEI Quanta 200F) to obtain high-resolution images and to determine the distribution of elements. More detailed procedures of the elemental, mineralogical, and microphotographic analyses can be found in a series of published references. − …”

Section: Methods and Samplesmentioning

confidence: 99%

Assessing the Gas Potential of the Lower Paleozoic Shale System in the Yichang Area, Middle Yangtze Region

et al. 2021

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This study aims to characterize the geological properties and to evaluate the gas potential of the lower Paleozoic shales in the Yichang area by integrating a series of analyses on geology and geochemistry, well logging data, and 2D seismic interpretation. The thickness of the lower Cambrian Shuijingtuo shale is less than 10 m in the southeast but may exceed 120 m in the southwest area. The thickness of the upper Ordovician Wufeng shale and the lower Silurian Longmaxi shale (hereafter referred to as the Wufeng-Longmaxi shale) gradually increases in thickness from <10 m in the south to 40–50 m in the northeast. The organic matter of the above two sets of black shale is mainly dominated by type I and II1 kerogen. The thickness of black shale units with TOC > 2% is more than 10–20 m, commonly located at the bottom of the shale intervals. Black shales near the Huangling anticline have low thermal maturity due to its relatively shallow burial. The predominant minerals are quartz and clay minerals. Carbonate contents of the Shuijingtuo shale are relatively high compared to the Wufeng-Longmaxi shale. Pores are more developed in the Wufeng-Longmaxi shale than those in the Shuijingtuo shale. Natural fractures are common in the Shuijingtuo shale but are rare in the Wufeng-Longmaxi shale. The well logging and lab analytical results both indicate that the natural gas content in the black shales is relatively high. The prospective area of the Shuijingtuo interval for shale gas production is nearly 670 km2, located in the southwestern region. In contrast, the prospective area of the Wufeng-Longmaxi interval for shale gas production is approximately 1590 km2, situated in the eastern area.

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“…To analyse the optical characterization, a few methods were completed to confirm the properties of the ZnO Nps. The methods used were XRD analysis where the structure of hexagonal wurtzite of ZnO NPs can be observed [28], Field Emission Scanning Electron Microscopy (FE-SEM) analysis to determine the surface morphology, porosity, particle size of the ZnO NPs [29] and Fourier Transform Infrared (FTIR) Spectroscopy Analysis is to determine the polymeric properties of ZnO NPs by relying on infrared light to scan samples and observe bond properties [30]. Besides that, the Ultraviolet-visible spectroscopy (UV-vis) is used to determine the concentration of an analyte in a solution [31].…”

Section: Introductionmentioning

confidence: 99%

The Green Synthesis of Nanoparticle Zinc Oxide (ZnO) Using Aloe Vera Leaf Extract: Structural and Optical Characterization Reviews

2020

IJETER

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This work is to review the previous, current and latest findings on the structural and optical properties of the ZnO nanoparticles formed by the various green synthesis methods. Each method involves a different chemical reaction, and it affects the quality of the ZnO formed on the substrates. Zinc oxide (ZnO) is a wide and direct semiconductor with a wurtzite crystal structure. Nano-scaled ZnO as today has been synthesized through green synthesis using natural plant extract as an effective 'reducing agent' of the metal precursor, which has been reported to be an effective cleaner and environment-friendly alternative towards the physical and chemical methods. This Final Year Report is based on the green synthesis and the main physical optical properties of pure ZnO nanoparticles synthesized by a completely green chemistry process using the natural extract of Aloe Barbadensis Miller (Aloe Vera) Leaf Extract to bio-reduce the zinc precursor. The different zinc precursor concentration is recognized to affect the particle size as well as on the optical properties such as surface morphology, porosity, particle size and the polymeric properties of ZnO nanoparticles. The green synthesis of NPs ZnO use is much better and affordable because the process provides more eco-friendly, economical, free toxic, and easy to compose rather than the chemical and physical methods. The main characteristics and the applications of these synthesized zinc oxide are also reported by using different analysis equipment to be the main focus on such as X-Ray Diffraction (XRD) Analysis, Field Emission Scanning Electron Microscopy (FE-SEM), Fourier Transform Raman (FT-Raman), Photoluminescence Spectra (PL)

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Evolution of porosity and pore geometry in the Permian Whitehill Formation of South Africa – A FE-SEM image analysis study

Cited by 27 publications

References 41 publications

Sedimentary organic matter characterization of the Whitehill shales (Karoo Basin, South Africa): An integrated quantitative approach using FE-EPMA and LA-ICP-MS

Sedimentary organic matter characterization of the Whitehill shales (Karoo Basin, South Africa): An integrated quantitative approach using FE-EPMA and LA-ICP-MS

Assessing the Gas Potential of the Lower Paleozoic Shale System in the Yichang Area, Middle Yangtze Region

The Green Synthesis of Nanoparticle Zinc Oxide (ZnO) Using Aloe Vera Leaf Extract: Structural and Optical Characterization Reviews

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