Atomic force microscopy study on microstructure of various ranks of coals

Pan, Jienan; Zhu, Haitao; Bai, Heling; Zhao, Yanqing; Wang, Haichao; Yao, Liping

doi:10.1007/s12404-013-0307-0

Cited by 11 publications

(8 citation statements)

References 14 publications

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“…They can roughly be divided into three categories, i.e., direct observations of the surface morphology, fluid intrusion methods, and X-ray and spectroscopic methods (Figure 1). Direct observation methods mainly include optical microscope observations, 25 scanning electron microscopy (SEM), 16 helium ion microscopy (HIM), 26 atomic force microscopy (AFM), 7,27 and transmission electron microscopy (TEM). 12,28 Fluid intrusion methods mainly include gas adsorption 29,30 and mercury injection 31 methods.…”

Section: Detection Methods For Coal Poresmentioning

confidence: 99%

“…They can roughly be divided into three categories, i.e., direct observations of the surface morphology, fluid intrusion methods, and X-ray and spectroscopic methods (Figure ). Direct observation methods mainly include optical microscope observations, scanning electron microscopy (SEM), helium ion microscopy (HIM), atomic force microscopy (AFM), , and transmission electron microscopy (TEM). , Fluid intrusion methods mainly include gas adsorption , and mercury injection methods. The X-ray and spectroscopic methods mainly include X-ray microcomputed tomography (micro-CT), − nuclear magnetic resonance (NMR), , small-angle X-ray scattering (SAXS), and small-angle neutron scattering (SANS) experiments.…”

Section: Detection Methods For Coal Poresmentioning

confidence: 99%

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Coal Pores: Methods, Types, and Characteristics

et al. 2021

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Coal pores are the locations of coalbed methane occurrence and enrichment and the main storage space targeted in CO2 sequestration. The systematic investigation of the coal pore structure and its development is of great significance to provide insights into coalbed methane generation, coal mine gas outburst mechanisms, and coal seam CO2 sequestration. In this study, coal pore testing technologies and methods, pore classification methods, and coal pore structure characteristics and their main control factors were systematically investigated and summarized. The results show that direct test methods, indirect fluid injection test methods, and X-ray and spectroscopic methods have been used for the quantitative characterization of the pore structure. However, each testing method has limitations. Therefore, a comprehensive method for the quantitative characterization of the full-scale pore structure must be developed, especially for the accurate quantitative characterization of closed pores in coal. The in situ measurement of pores in coal is one of the future research trends. Classification methods of pores in coal mainly include the classification of the genetic pore type, pore size, and pore morphology. Metamorphism, tectonic deformation, and macerals are the main internal factors affecting the pore distribution in coal. The effect of tectonic deformation on the macromolecular structure and micro- and ultramicropores of coal must be further studied. In addition, molecular mechanics simulations, molecular dynamics simulations, and quantum chemistry calculations of the dynamic response of the macromolecular structure and micro- and ultramicropores during gas adsorption and desorption must be carried out.

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Section: Detection Methods For Coal Poresmentioning

confidence: 99%

“…They can roughly be divided into three categories, i.e., direct observations of the surface morphology, fluid intrusion methods, and X-ray and spectroscopic methods (Figure ). Direct observation methods mainly include optical microscope observations, scanning electron microscopy (SEM), helium ion microscopy (HIM), atomic force microscopy (AFM), , and transmission electron microscopy (TEM). , Fluid intrusion methods mainly include gas adsorption , and mercury injection methods. The X-ray and spectroscopic methods mainly include X-ray microcomputed tomography (micro-CT), − nuclear magnetic resonance (NMR), , small-angle X-ray scattering (SAXS), and small-angle neutron scattering (SANS) experiments.…”

Section: Detection Methods For Coal Poresmentioning

confidence: 99%

Coal Pores: Methods, Types, and Characteristics

et al. 2021

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“…Анализ опубликованной литературы, посвященной атомно-силовой микроскопии углей, показал, что наблюдаемое нами строение вещества для углей низких стадий зрелости довольно характерно [Pan et al, 2013].…”

Section: рис 10 электронно-микроскопические изображения морфологичеunclassified

Unusual Devonian Coal: A New Type of Jet

2015

GiG

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Описывается новый тип гагата из континентальных девонских отложений. Субстратом гагатизации служили фрагменты археоптерисовых растений, захоронения в пластах песчаника отличаются своеобразной шаровой отдельностью органического вещества, материал полностью фюзенизирован. Гагат характеризуется интеграцией свойств классического гагата и инертинита. Новому типу гагата предложено собственное название по месту обнаружения-цильманит. Гагат, фюзен, девон, континентальные отложения, Средний Тиман. UNUSUAL DEVONIAN COAL: A NEW TYPE OF JET I.Kh. Shumilov A new type of jet from continental Devonian sediments is described. The substrate for gagatization was fragments of Archaeopteris plants, whose burials in sandstone strata are characterized by a kind of spheroidal weathering of organic matter; the material is completely fusainized. This type of jet combines the properties of classical jet and inertinite. The new type of jet was named tsilmanite, after the place of its discovery. Jet, fusain, Devonian, continental sediments, Middle Timan region ВВЕДЕНИЕ При полевых исследованиях девонских терригенных отложений цилемской и устьчиркинской свит (тиманский горизонт) в обнажениях среднего течения р. Цильма на Среднем Тимане (рис. 1) нами обнаружены весьма необычные углефицированные фрагменты крупных растений (части стволов и больших ветвей)-в выветрелом состоянии органическое вещество (ОВ) преимущественно сложено угольными шарами диаметром до 25 мм (рис. 2). Кроме того, при проведении экспериментов по выделению спор из упомянутых пород нами была выявлена особенность угольного детрита, выражающаяся в его большей химической устойчивости, чем спорополленина сопутствующих спор, что также неординарно [Шумилов, Тельнова, 2013]. ГЕОЛОГИЧЕСКИЙ ОЧЕРК Девонская толща района исследований представлена континентальными зеленоцветными осадками аллювиальной равнины, изредка заболачиваемой, периодически затапливаемой мелководным опресненным водоемом (лагуной), и красноцветными отложениями пролювиальных конусов выноса, имеющих локальное развитие. Красноцветные породы проксимальных зон конусов выноса представлены преимущественно глиняными гравелитами, а дистальных-глинами, алевритами, маломощными протяженными линзами косослоистых песчаников. Разрезы сложены элементарными циклитами мощностью 0.2-1.7 м, образовавшимися в результате импульсных (катастрофических) сбросов рыхлого материала кор выветривания с возвышенностей в виде единовременных гряземутьевых потоков [Шумилов, 2011, 2013а,б]. Характерной чертой рассматриваемых отложений является наличие в них многочисленных палеопочвенных профилей, располагающихся друг над другом через интервал 0.5-2 м, фиксируя кровли циклитов [Шумилов, Мингалев, 2009]. Зеленоцветный разрез сложен многочисленными элементарными циклитами с песчаной нижней, алевритовой средней и глинистой верхней частями. Часто циклиты завершаются микроконкреционным слоем перерыва осадконакопления, реже слабовыраженным палеопочвенным горизонтом [Шумилов, 2010]. Мощность циклитов варьирует от 0.5 до 5 м. Отложения сложены смесью мелкого п...

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“…Yang obtained high-resolution images of coal structures by combining scanning tunneling microscopy (STM) and AFM (Qi et al, 1994). Pan et al performed preliminary research on the pore structures of tectonically de-formed coal using AFM, and their results revealed that coalification can increase the amount of micropores in coal (Pan et al, 2013(Pan et al, , 2015. Eliyahu et al (2015) were the first to apply AFM to the analysis of shale samples, and Pan et al (2018) examined the surface morphology of shale samples using AFM.…”

Section: Introductionmentioning

confidence: 99%

“…Pan et al. performed preliminary research on the pore structures of tectonically de-formed coal using AFM, and their results revealed that coalification can increase the amount of micropores in coal (Pan et al., 2013, 2015). Eliyahu et al.…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of nano-scale pore structures of broad sense shale oil reservoirs using atomic force microscopy

Shen

Xiong

Lang

et al. 2021

Energy Exploration & Exploitation

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The rapid and cost-effective quantitative characterization of broad-sense shale oil reservoirs is highly challenging due to the complex lithology and strong heterogeneity of the strata. In this paper, the pore structures and surface roughness of samples of various lithologies from a shale oil reservoir were studied using atomic force microscopy (AFM) and the open-source Gwyddion analytical software. The surface morphology was reconstructed both two-dimensionally and three-dimensionally using the AFM data for the mudstone, siltstone, and dolarenite in a broad-sense shale oil reservoir. The surface roughness was evaluated with respect to parameters such as the arithmetic average roughness, root mean square roughness, surface skewness, and kurtosis coefficient. The pores of various scales were quantitatively identified using the watershed algorithm. The samples were also evaluated using focused ion beam scanning electron microscopy for comparison, and the derived pore scales are consistent with those obtained from the AFM analysis. In conclusion, the utilization of AFM and open-source software provides a new easy-to-operate method, which can be widely applied to characterize the surface roughness and pore structures of unconventional oil and gas reservoirs.

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Atomic force microscopy study on microstructure of various ranks of coals

Cited by 11 publications

References 14 publications

Coal Pores: Methods, Types, and Characteristics

Coal Pores: Methods, Types, and Characteristics

Unusual Devonian Coal: A New Type of Jet

Quantitative analysis of nano-scale pore structures of broad sense shale oil reservoirs using atomic force microscopy

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