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International journal of coal geology 12건

  1. [해외논문]   Editorial Board   SCI SCIE


    International journal of coal geology v.189 ,pp. ii - ii , 2018 , 0166-5162 ,

    초록

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  2. [해외논문]   Microstructure of graptolite periderm in Silurian gas shales of Northern Poland   SCI SCIE

    Morga, Rafał (Silesian University of Technology, Faculty of Mining and Geology, Institute of Applied Geology, Akademicka 2, 44-100 Gliwice, Poland ) , Pawlyta, Mirosława (Silesian University of Technology, Institute of Engineering Materials and Biomaterials, Konarskiego 18A, 44-100 Gliwice, Poland)
    International journal of coal geology v.189 ,pp. 1 - 7 , 2018 , 0166-5162 ,

    초록

    Abstract Core samples of Silurian graptolite shales from an exploration borehole within the Baltic Basin were examined by optical microscopy, Raman spectroscopy and high resolution transmission electron microscopy. Graptolite periderm is composed of poorly ordered carbonaceous material of mainly aromatic structures. The dimension of the coherent domains is 1–2 nm. They are composed of two to three stacked layers. Raman spectral parameters of graptolite periderm are correlated with the mean random (R r ) and mean maximum (R max ) reflectance of graptolites. The spectral I D1 /I G ratio predicts thermal maturity in a mean reflectance of graptolites (R r ) range between 1.30% and 1.80% (R max ≈ 1.40–2.00%; Vitrinite Reflectance Equivalent VRE ≈ 1.10–1.50%). It is possible to calculate VRE Raman from the I D1 /I G ratio. Highlights HRTEM imaging of the graptolite periderm performed for the first time. Graptolite periderm is a poorly ordered carbonaceous material of mainly aromatic structures. The dimension of the coherent domains in the graptolite periderm is 1–2 nm. Several Raman spectral parameters are correlated with graptolite reflectance. The I D1 /I G ratio - predicts thermal maturity, when graptolite reflectance (R r ) is 1.30–1.80%.

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  3. [해외논문]   The genesis and evolution of carbonate minerals in shale oil formations from Dongying depression, Bohai Bay Basin, China   SCI SCIE

    Bai, Chenyang (School of Geosciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China ) , Yu, Bingsong (School of Geosciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China ) , Liu, Huimin (Geological Research Institute of Shengli Oilfield Company, Sinopec, Dongying 257000, China ) , Xie, Zhonghuai (Geological Research Institute of Shengli Oilfield Company, Sinopec, Dongying 257000, China ) , Han, Shujun (School of Geosciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China ) , Zhang, Liyuan (School of Geosciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China ) , Ye, Ruochen (School of Geosciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China ) , Ge, Jia (Oil & Gas Survey, China Geological Survey, Beijing 100083, China)
    International journal of coal geology v.189 ,pp. 8 - 26 , 2018 , 0166-5162 ,

    초록

    Abstract Shale oil is attracting increasing attention in the petroleum industry as an essential target of unconventional oil and gas exploration. Recent exploration efforts have indicated that laminar carbonates are closely related to the favorable depositional strata of shale oil. This research focused on inter-bedded layers of laminar carbonates as well as mudstone and shale in the Dongying depression of the Bohai Bay Basin in eastern China, and attempted to reveal the genesis and evolution of the carbonates by means of drill core observations, thin sections, high resolution scanning electron microscopic observations, and fluorometric, cathodoluminescence and geochemical analyses. The results demonstrated that: (1) the carbonates could be categorized into two groups, crystalline carbonates and micritic carbonates; (2) the crystalline carbonates were well crystallized and greenish under fluorescent light; and (3) the micritic carbonates were not well crystallized and had biotic textures. It was discovered that the crystalline carbonates were mainly developed in the shale layer and were formed from the late-filling effects of the diagenetic cracks along the shale fissility planes; shale layers with crystalline carbonates are usually favorable for shale oil reserves. The micritic carbonates were formed from direct deposition controlled by biological effects in the stratified flows of the seasonal lake basins and are unfavorable for shale oil reserves. Highlights The laminar carbonates in organic-rich shale layers could be categorized crystalline and micritic carbonates. The main factor controlling on crystalline carbonates is diagenetic fluids. The micritic carbonates were formed from direct deposition controlled by biological effects. The crystalline carbonates in organic-rich shale layers could be favorable shale oil reservoir.

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  4. [해외논문]   Distribution and occurrence of lithium in high-alumina-coal fly ash   SCI SCIE

    Hu, Pengpeng (CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100090, China ) , Hou, Xinjuan (CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100090, China ) , Zhang, Jianbo (CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100090, China ) , Li, Shaopeng (CAS Key Laboratory of Green Process and Engineering, National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100090, China ) , Wu, Hao (Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK 2800, Kg) , Damø, Anne Juul , Li, Huiquan , Wu, Qisheng , Xi, Xinguo
    International journal of coal geology v.189 ,pp. 27 - 34 , 2018 , 0166-5162 ,

    초록

    Abstract High-alumina-coal fly ash (HAFA) with a high Li content is regarded as a potential resource for Li production. To support the development of Li recovery technology from HAFA, the distribution and modes of occurrence of Li in HAFA were investigated. HAFA was separated into magnetic particles, glass, and mullite+corundum+quartz (MCQ) using an acid-alkali combination method. 79–94% of the Li was found in glass, with the remaining 5–16% and 3 (0Al) and Q 3 (1Al) structures by reacting with Q 4 (0Al) and Q 4 (1Al). Based on the experimental and simulation results, we propose extracting Li during the pre-desilication process by dissolving the glass phase. Highlights Chemical state imaging of Li in the HAFA, magnetic particles and MCQ was obtained using TOF-SIMS. Modes of occurrence of Li in the glass of HAFA were investigated by NMR analysis and molecular simulation. Lithium tends to occur in Q 3 (0Al) and Q 3 (1Al) structures in the glass of HAFA.

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  5. [해외논문]   Characterization of pore-fracture networks and their evolution at various measurement scales in coal samples using X-ray μCT and a fractal method   SCI SCIE

    Zhou, H.W. (State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, PR China ) , Zhong, J.C. (School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, PR China ) , Ren, W.G. (School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, PR China ) , Wang, X.Y. (School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, PR China ) , Yi, H.Y. (College of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, PR China)
    International journal of coal geology v.189 ,pp. 35 - 49 , 2018 , 0166-5162 ,

    초록

    Abstract The characteristics of pore-fracture networks, as well as their evolution in coal during loading, are important for exploration of coalbed methane. In this study, the evolution of fracture networks in coal during loading was investigated using X-ray micro-Computed Tomography (X-ray μCT) with a uniaxial compression facility. The cross-sectional slices of the coal sample were obtained by μCT scanning at ten loading levels. The physical and geometrical parameters, such as porosity, fracture aperture, fracture density, and connectivity, were obtained by processing the 3D μCT data. Along with the self-similar characteristics of the 3D fracture networks, a simplified Sierpinski-like fractal model was proposed to further examine the evolution of the pore-fracture networks with higher measurement accuracy. The results showed that the developed fractal model had the ability to characterize the geometrical characteristics of the pore-fracture networks at various measurement scales. With the decreasing measurement scale r , the porosity and volumetric fractal dimensions of the pore-fracture networks increased, which were approximately linear and logarithmic curves with respect to log (1/ r ), respectively. At the measurement scale of 50 μm, the longitudinal cleavage fractures, which were parallel to or perpendicular to the joints, were generated during uniaxial compression. The fracture porosity, as well as the fracture density, increased with increasing axial stress. The fracture growth process could be divided into three stages: the initial stage, the stable growth stage, and the accelerated growth stage. At the measurement scale of 0.008 μm, the pore-fracture evolution in the coal sample under uniaxial compression occurred in four phases, namely, the pore compaction phase, the production phase of new fractures, the stable development phase of main fractures, and the accelerated production and development phase of the fractures. At the measurement scale of 0.5 μm, the coal permeability varied in a V-shaped curve with axial stress. Highlights A pore-fracture network in coal under uniaxial compression was characterized by combining the MIP, X-ray μCT techniques. A simplified Sierpinski-like fractal model was proposed to describe the evolution of the pore-fracture networks. The changes in the porosity, permeability and volumetric fractal dimension corresponding to axial stress were evaluated.

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  6. [해외논문]   Lignite oxidation under the influence of glacially derived groundwater: The pyropissite deposits of Zeitz-Weißenfels (Germany)   SCI SCIE

    Gerschel, H. (GEOmontan Gesellschaft für angewandte Geologie mbH, Am St. Niclas Schacht 13, 09599 Freiberg, Germany ) , Rascher, J. (GEOmontan Gesellschaft für angewandte Geologie mbH, Am St. Niclas Schacht 13, 09599 Freiberg, Germany ) , Volkmann, N. (TU Bergakademie Freiberg, Institute of Geology, Working Group on Geology of Fossil Fuels, Gustav-Zeuner-Straße 12, 09599 Freiberg, Germany ) , Ligouis, B. (Laboratories for Applied Organic Petrology (LAOP Tübingen), c/o Eberhard-Karls-Universität Tübingen (Institut für Ur- und Frühgeschichte und Archäologie des Mittelalters Zentrum für Naturwissenschaftliche Archäologie), Rümelinstraße 23, 72070 Tübingen, Germany ) , Kus, J. (Federal Institute of Geosciences and Natural Resources (BGR), Geochemistry of Energy Resources and Gas Monitoring, Stilleweg 12, 30655 Hannover, Germany ) , Bretschneider, F. (Laboratories for Applied Organic Petrology (LAOP), Straße der Freundschaft 92, 02991 Lauta, Germany ) , Schneider, W. (Alte Berliner Straße 13d, 02977 Hoyerswerda, Germany)
    International journal of coal geology v.189 ,pp. 50 - 67 , 2018 , 0166-5162 ,

    초록

    Abstract The Middle Eocene lignites of the Zeitz-Weißenfels coal mining area in central Germany hosted one of the most economically successful lithotypes of lignite deposits utilised in the paraffin industry of the 19th century, i.e. the pyropissite deposits. However, due to their economic significance, these rare lithotypes were almost completely mined out, such that presently only a few remnant deposits are known. Apart from the Zeitz-Weißenfels coal mining district, other pyropissite deposits were also encountered in other lignite mines, for instance, in the Hessian and Subhercynian Basins. Pyropissite is a whitish and bitumen-rich variety of soft brown coal (lignite) lithotypes, dominated by a homogeneous matrix with loosely embedded organic and inorganic components. Fresh exposure of pyropissite at Grana was logged and studied petrographically and geochemically, along with samples obtained from archival collections. Results were compared with those from the 19th and 20th century to derive general conclusions regarding origin and formation of pyropissite. Microscopically, the main constituent of this special lignite lithotype is amorphous to detrital in appearance. According to W. Schneider the term xanthinite is applied to this component, which forms the groundmass of the pyropissite. It contains high proportions of liptinitic substances with contributions of formless huminitic material and minor amounts of mineral matter. Geochemically, pyropissite is characterised by an increased H/C atomic ratio and a very high content of bitumen (in terms of toluene-soluble components) as well as low-temperature carbonisation tar. The obtained data revealed that the extraordinarily high content of liptinite and the paucity of huminitic material of the pyropissite deposits of the Zeitz-Weißenfels coal mining area are not related to primary depositional processes but rather are the result of dissipation of high condensed huminites and the consequent enrichment of liptinitic substances. The mechanism involves oxidation by groundwater and is related to glaciation processes operating during the Pleistocence. Such glacially derived processes also account for both vertical and horizontal distributions of the pyropissite. Thus, recent research activities may also serve as an innovative inspiration to fundamental understanding of the formation of lignites with extremely high liptinite content. Highlights Pyropissite is a whitish and bitumen-rich soft brown coal lithotype. According to W. Schneider the microscopical groundmass of pyropissite is termed xanthinite. Pyropissite can develop due to glacigenous alteration.

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  7. [해외논문]   In honor of Dr. Yuri B. Melnichenko: Application of neutron scattering (SANS and USANS) to research on fossil fuel energy sources   SCI SCIE

    Ruppert, Leslie F. (U.S. Geological Survey, MS956, Reston, VA 20192, USA ) , Radlinski, Andrzej P. (University of Warsaw, Faculty of Physics, ul. Pasteura 5, 02-093 Warsaw, Poland)
    International journal of coal geology v.189 ,pp. 68 - 69 , 2018 , 0166-5162 ,

    초록

    Highlights Neutron scattering techniques pioneered by Yuri Melnichenko provide insight into various aspects of conventional and unconventional resources.

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  8. [해외논문]   Fossil cutin of Johnstonia coriacea (Corystospermaceae, Upper Triassic, Cacheuta, Argentina)   SCI SCIE

    D'Angelo, José (IANIGLA-CONICET, FCEN, Universidad Nacional de Cuyo, M5502JMA Mendoza, Argentina ) , A. (Palaeobotanical Laboratory, Cape Breton University, Sydney, Nova Scotia B1P 6L2, Canada) , Zodrow, Erwin L.
    International journal of coal geology v.189 ,pp. 70 - 74 , 2018 , 0166-5162 ,

    초록

    Abstract For the first time, a cutin polymer was obtained from specimens of Johnstonia coriacea (Corystospermales, Corystospermaceae) from the Upper Triassic of Cacheuta, Argentina. These are preserved as fossilized cuticles i.e., naturally macerated compressions under anoxic conditions. Laboratory oxidation reactions were used to obtain the cuticle, which after additional, long-term oxidation yielded the cutin polymer. Cutin, cuticles, and fossilized cuticles, were analyzed by semi-quantitative Fourier transform infrared (FTIR) spectroscopy. Cutin IR spectrum was mainly characterized by intense peaks of aliphatic stretching bands at 3000–2600 cm −1 , ester C=O groups centered at 1730–1715 cm −1 , and aromatic C=C absorption bands at 1645–1640 cm −1 . Values of semi-quantitative, IR-derived ratios of cutin were lower than those of the cuticle. The only exception was the notably higher C=O/C=C ratio found in cutin, which is supportive of the presence of ester C=O groups. CH al /C=O value (0.8) of J. coriacea compares with those recorded for Lycopersicon esculentum (0.8; extant) and Macroneuropteris sheuchzeri (0.9; Pennsylvanian), which indicates a similar cross-linking degree of the monomers characterizing the cutin of both extant and fossil taxa. Highlights First-time spectroscopic study of Triassic cutin (Cacheuta, Mendoza, Argentina) Fossilized cuticles of Johnstonia coriacea show cutin preservation. Fourier transform infrared spectroscopy provides chemical data. A structure including crossed-linked ester bonds is suggested. High chemical resistance of cutin could represent a specialized physiological adaptation. Graphical abstract [DISPLAY OMISSION]

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  9. [해외논문]   Rare earth element associations in the Kentucky State University stoker ash   SCI SCIE

    Hower, James C. (University of Kentucky, Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, United States ) , Qian, Dali (University of Kentucky, Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, United States ) , Briot, Nicolas J. (University of Kentucky, Electron Microscopy Center, Lexington, KY 40506, United States ) , Henke, Kevin R. (University of Kentucky, Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, United States ) , Hood, Madison M. (University of Kentucky, Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, United States ) , Taggart, Ross K. (Duke University, Department of Civil & Environmental Engineering, Durham, NC 27708, United States ) , Hsu-Kim, Heileen (Duke University, Department of Civil & Environmental Engineering, Durham, NC 27708, United States)
    International journal of coal geology v.189 ,pp. 75 - 82 , 2018 , 0166-5162 ,

    초록

    Abstract The Kentucky State University heating plant stoker ash, with over 1000 μg/g Rare earth elements + yttrium (REY), was previously shown to be more resistant to acid-extraction than pulverized-coal fly ashes of similar bulk composition. In this study, the petrology and mineralogy of this stoker ash was examined in greater detail as a means to better understand why the REY were relatively inert towards acid extraction. The results showed that this stoker ash is dominated by mullite and quartz/cristobalite with lesser amounts of hematite and magnetite compared to the glass-dominated assemblages of pulverized-coal-combustion fly ashes with similar chemical compositions. On the nanometer to micron scale, La-Ce-Nd-bearing monazite and Ce phosphates (monazite – CePO 4 and CeP 3 O 9 ) are seen to be part of the mineral assemblage. Overall, the results demonstrate that despite the presence of discrete REY-bearing minerals in the sample, their encapsulation within other phases may explain their low extractability.

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  10. [해외논문]   Characterization of methane adsorption on shale and isolated kerogen from the Sichuan Basin under pressure up to 60 MPa: Experimental results and geological implications   SCI SCIE

    Li, Jing (Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, China ) , Zhou, Shixin (Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, China ) , Gaus, Garri (Institute of Geology and Geochemistry of Petroleum and Coal, RWTH Aachen, Germany ) , Li, Yuanju (Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, China ) , Ma, Yu (Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou, China ) , Chen, Kefei (Key Laboratory of Petroleum Resources, Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou,) , Zhang, Yuhong
    International journal of coal geology v.189 ,pp. 83 - 93 , 2018 , 0166-5162 ,

    초록

    Abstract A series of methane adsorption isotherms were measured at pore pressures up to 60 MPa and at 60 °C, 100 °C and 140 °C for dried and overmature Paleozoic shales and isolated kerogen from the Sichuan Basin. At first, the measured excess adsorption increases with increasing pressure, reaches a maximum value at pressures ranging between 8 and 18 MPa and then decreases. The rate of decrease reduces with increasing pressures from 18 to 60 MPa, which is attributed to the nonlinear increase of free methane density with pressure. Additionally, an unusual increase of excess adsorption at pressures from 48 to 60 MPa was observed. Both, the supercritical Dubinin-Radushkevich (SDR)-based and Langmuir-based excess adsorption models, represent the excess adsorption isotherms equally well. The fitted maximum absolute adsorption capacities, when based on raw data from 0 to 30 MPa, are larger by an average of 11.5% when compared to the raw data from 0 to 60 MPa. This deviation indicates that experimentally derived gas adsorption characteristics can be biased with respect to the maximum pore pressure used in the respective experiments. The kerogen contribution to the total methane adsorption capacity of studied Paleozoic shale samples under in-situ hydrostatic pressure and temperature conditions of main shale formations in the Jiaoshiba shale gas play is lower than 50%. However, this contribution should be larger under realistic geological conditions, especially as existent moisture will affect clays stronger than organic matter and therefore reduce the contribution of clay towards the total sorption capacity. The estimated GIP of Paleozoic shales under geological hydrostatic pressure and temperature conditions of main shale formations in the Jiaoshiba shale gas play is 5.36–6.64 cm 3 /g. Highlights Methane adsorption isotherms of shale under pressure up to 60 MPa were measured. An unusual increase of excess adsorption amount under high pressure was observed. Contribution of kerogen to methane adsorption capacity of shale were estimated.

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