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Changes in chemistry of vitrinite in coal through time: Insights from organic functional group characteristics Int. J. Coal Geol. (IF 5.692) Pub Date : 2021-01-21 Maria Mastalerz; Agnieszka Drobniak; James C. Hower
Is the signature of the original plant communities preserved in coal, or is that signature overprinted by depositional and diagenetic processes? To address this question, Pennsylvanian coals from the Illinois and Appalachian basins were compared to Cretaceous, Paleocene, and Eocene coals of comparable coalification levels as shown by vitrinite reflectance. Three reflectance intervals—0.52–0.55, 0.58–0
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Numerical investigation of the effects of proppant embedment on fracture permeability and well production in Queensland coal seam gas reservoirs Int. J. Coal Geol. (IF 5.692) Pub Date : 2021-01-14 Duo Wang; Zhenjiang You; Raymond L. Johnson; Lei Wu; Pavel Bedrikovetsky; Saiied M. Aminossadati; Christopher R. Leonardi
This paper introduces the development of a new predictive model in support of proppant injection in naturally fractured coal seam gas (CSG) reservoirs. In the proposed model, the finite element method (FEM) is used for the prediction of proppant embedment and elastoplastic deformation of the coal. The lattice Boltzmann method (LBM) is applied to the modelling of fluid flow through propped fractures
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Adherent microbes in coal seam environments prefer mineral-rich and crack-associated microhabitats Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-12-06 Andrew G. McLeish; Silas H.W. Vick; Mihaela Grigore; Kaydy L. Pinetown; David J. Midgley; Ian T. Paulsen
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A novel VRo, Tmax, and S indices conversion formulae on data from the fold-and-thrust belt of the Western Outer Carpathians (Poland) Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-12-23 Marta Waliczek; Grzegorz Machowski; Paweł Poprawa; Anna Świerczewska; Dariusz Więcław
Results are presented on the relationships between the vitrinite reflectance VRo, the Tmax temperatures determined with Rock-Eval pyrolysis, and the smectite (S) indices representing the percentage of smectite in the mixed-layer illite-smectite (I/S) from claystones. Samples locations are recovered from the Polish part of the Outer Carpathian fold-and-thrust belt. Organic indices show thermal maturities
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Reasons for carbon isotope rollover in the Yan'an gas field of the southern Ordos Basin, China: Evidence from the geochemical comparison of gas from fluid inclusions with wells Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-12-01 Wenxue Han; Shizhen Tao; Weijiao Ma; Yong Li; Guangxi Ou
Samples for inclusion analysis were collected to investigate reasons for carbon isotope rollover in the Yan'an gas field (YAGF). Homogenization temperature of fluid inclusions, constituents and carbon isotope of gases in fluid inclusions were measured. Geochemical parameters of gas in wells and fluid inclusions in the northern gas fields (NGF) and YAGF were compared. The results show that geochemical
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First investigation of microbial diversity and biogenic methane potential in coal mines located in the Red River Basin, Vietnam Int. J. Coal Geol. (IF 5.692) Pub Date : 2021-01-02 Lan Hoang; Thi Thuy Phung; Michael Urynowicz; Kim Anh To; Quoc Hung Le; Zaixing Huang; Hong Thanh Lai; Qiurong Wang; Rizwan Haider; Lan Huong Nguyen
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Effects of composition and temperature on water sorption in overmature Wufeng-Longmaxi shales Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-12-23 Ji Chen; Haifeng Gai; Qilin Xiao
Water sorption provides a great approach to understand water-shale interaction. In this research, water sorption isotherms of fourteen Wufeng-Longmaxi shale samples collected from the eastern Sichuan Basin of China were generated and then interpreted by classical sorption models. The sorption behavior of water and its relationship with pore structure, organic/inorganic composition, and temperature
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Concentrating rare earth elements to phosphate in molten coal ash by a temperature gradient approach Int. J. Coal Geol. (IF 5.692) Pub Date : 2021-01-11 Jack Widmer; Jinichiro Nakano; Anna Nakano; James Bennett
Synthetic coal ash bearing 560 ppm europium oxide, blended with aluminum phosphate, was heat treated above its melting temperature and crystal evolutions with respect to europium concentration under controlled cooling were studied. The sample in a boat crucible was subjected to a temperature gradient of 100 °C across it to cause zone refining effects on crystallization behaviors in the melt (slag)
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Influence of magmatic fluids on the organic and inorganic fractions of coals from the Peñarroya-Belmez-Espiel Basin (Spain) Int. J. Coal Geol. (IF 5.692) Pub Date : 2021-01-08 H. Moura; I. Suárez-Ruiz; M.M. Marques; J. Ribeiro; P.P. Cunha; D. Flores
The study of coals affected by magmatic intrusions is important from a geological point of view, in order to understand how heat and magmatic fluids could affect the organic and inorganic fractions as well as the properties of the coals. These fluids may lead to an enrichment of trace elements and heavy metals of environmental concern or serve as unconventional sources of critical elements. Therefore
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Preservation of organic carbon in Hue Shale on the North Slope of Alaska: Insights from pyrite morphology Int. J. Coal Geol. (IF 5.692) Pub Date : 2021-01-08 Liaosha Song; Shuvajit Bhattacharya; Zachary Webb; Austin Fowler; Victoria Lee; Timothy Scott Williams
The Cretaceous Hue Shale is a condensed mudstone section of the Brookian sequence with type II and type III kerogen, and it is one of the major source rocks that fill the world-class conventional oil fields on the North Slope, Alaska. The bottom section of the Hue Shale is referred to as Gamma Ray Zone (GRZ) or Highly Radioactive Zone (HRZ) and believed to be the most organic-rich section. The thermal
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Petrographic and chemical structure characteristics of amorphous organic matter in marine black shales: Insights from Pennsylvanian and Devonian black shales in the Illinois Basin Int. J. Coal Geol. (IF 5.692) Pub Date : 2021-01-08 Juan Teng; Maria Mastalerz; Bei Liu
Amorphous organic matter (AOM or bituminite) is a major oil-prone liptinite maceral in black shales that can be classified into two main types: low-reflectance AOM and micrinized AOM. In this study, we investigated the petrographic and chemical structure characteristics of these two types of AOM and discussed their origin based on 15 marine black shale samples from the Illinois Basin, including 5 samples
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Comprehensive evaluation of potential coal mine dust emissions in an open-pit coal mine in Northwest China Int. J. Coal Geol. (IF 5.692) Pub Date : 2021-01-08 Pedro Trechera; Teresa Moreno; Patricia Córdoba; Natalia Moreno; Xinguo Zhuang; Baoqing Li; Jing Li; Yunfei Shangguan; Ana Oliete Dominguez; Frank Kelly; Xavier Querol
Coal mining in China is continually increasing, and the associated emitted coal mine dust is of growing environmental and occupational concern. In this study, deposited coal mine dust (DD) was analysed in three different regions of an active, highly-volatile bituminous open-pit coal mine in the Xingjian Province, Northwest of China: coal working fronts, tailings handling sites, and road traffic sites
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Organic debris and allochthonous coal in Quaternary landforms within a periglacial setting (Longyearbyen Mining District, Norway) - A multi-disciplinary study (coal geology-geomorphology-sedimentology) Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-11-02 Harald G. Dill; Kus Jolanta; Buzatu Andrei; Balaban Sorin-Ionut; Kaufhold Stephan; Angeles G. Borrego
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Strontium isotopes in high- and low-Ge coals from the Shengli Coalfield, Inner Mongolia, northern China: New indicators for Ge source Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-11-20 Jingjing Liu; Baruch F. Spiro; Shifeng Dai; David French; Ian T. Graham; Xibo Wang; Lei Zhao; Jingtao Zhao; Rongshu Zeng
The coal-hosted Ge deposit (Early Cretaceous) at Wulantuga, Inner Mongolia, northern China, is one of the largest Ge deposits in the world. Although the origin, modes of occurrence, and spatial distribution of Ge in this deposit have been investigated by several studies, the provenance and pathways of Ge from the source to the deposit are largely unknown. In this study, we investigated the 87Sr/86Sr
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Depositional processes of plant fragment-concentrated sandstones in turbiditic sequences recorded by plant biomarkers (Miocene Kawabata Formation, Japan) Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-11-21 Satoshi Furota; Ken Sawada; Gentaro Kawakami
Occasionally, distinctive plant fragment (PF)-concentrated sandstone beds are found in the turbiditic sequence of the Miocene Kawabata Formation (Yubari, central Hokkaido, Japan) deposited in a foredeep basin. Sedimentological and organic geochemical analyses were carried out on the PF-concentrated sandstone bed to investigate the transport and depositional processes of the abundant PFs in the basin
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Organic petrology and geochemistry of Lower Cretaceous lacustrine sediments in the Chaoyang Basin (Liaoning Province, northeast China): Influence of volcanic ash on algal productivity and oil shale formation Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-12-06 Li Li; Zhaojun Liu; Lian Jiang; Simon C. George
Airfall volcanic ash deposited in the form of tuff layers is widely distributed in oil-shale bearing basins in western Liaoning Province, northeast China. In order to investigate the impacts of volcanic ash on algal productivity and the formation of organic-rich oil shales, the organic petrology and organic geochemistry of lacustrine sediments of the Lower Cretaceous Jiufotang Formation were investigated
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X-ray tomography imaging of shale microstructures: A review in the context of multiscale correlative imaging Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-11-19 Muhammad Arif; Mohamed Mahmoud; Yihuai Zhang; Stefan Iglauer
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Surface physico-chemistry governing microbial cell attachment and biofilm formation on coal Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-12-22 Nur Hazlin Hazrin-Chong; Theerthankar Das; Michael Manefield
An essential but missing component in our understanding of microbial interactions leading to coal bed methane (CBM) formation lies in the relationship between coal and coal-adhering microorganisms. Here, we explored the influence of surface physico-chemistry on the microbial cell attachment on coal, utilising a known coal-oxidising bacterium P. fluorescens Pf-5 as a model. Based on the interfacial
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Organic petrography and geochemistry of the prolific source rocks from the Jurassic Najmah and Cretaceous Makhul Formations in Kuwait – Validation and expansion of Raman spectroscopic thermal maturity applications Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-12-10 Mubarak Al-Hajeri; Bastian Sauerer; Agnieszka Furmann; Aimen Amer; Awatif Al-Khamiss; Wael Abdallah
Raman spectroscopy has been applied in numerous sedimentary formations to infer thermal maturity of mostly Type-II kerogen in organic-rich mudrocks. Robust correlations have been established between the Raman spectroscopic signal and vitrinite reflectance equivalents (%VRE) of the organic matter. Herein, traditional evaluation methods, organic petrography and geochemistry, were applied in addition
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Organic petrological and geochemical appraisal of the Upper Jurassic Naokelekan Formation, Kurdistan, Iraq Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-11-07 M.E. Damoulianou; K.Y. Kolo; A.G. Borrego; S.P. Kalaitzidis
Upper Jurassic Naokelekan Formation, being part of the intercepted strata of the well-known Miran oilfield in Kurdistan region of Northern Iraq, has been previously extensively evaluated as a potential/effective source rock, mainly by means of organic geochemistry. In the present study, a total of 60 samples were collected from four Naokelekan Fm. outcrops, those of Banik, Galy-Derash, Barsarin and
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Oil shale potential of the lower cretaceous Jiufotang Formation, Beipiao Basin, Northeast China Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-11-23 Penglin Zhang; Qingtao Meng; David Misch; Reinhard F. Sachsenhofer; Zhaojun Liu; Fei Hu; Lin Shen
Lacustrine oil shale is an important unconventional energy source in China. Previous exploration has mainly focused on stable deep lake deposits, whereas lacustrine oil shale layers in unstable sedimentary settings, which are widely distributed in Cretaceous strata, having received little research attention. The present paper is focused on the Aptian Jiufotang Formation in the Beipiao Basin. In order
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Automated coal petrography using random forest Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-11-09 Avinash Kumar Tiwary; Suman Ghosh; Rashmi Singh; Dipti Prasad Mukherjee; B. Uma Shankar; Pratik Swarup Dash
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Investigation of the carbon structure of naturally graphitized coals from Central Hunan, China, by density-gradient centrifugation, X-ray diffraction, and high-resolution transmission electron microscopy Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-11-04 Kuo Li; Qinfu Liu; Susan M. Rimmer; William W. Huggett; Shuai Zhang
A suite of six naturally graphitized coals were separated by density-gradient centrifugation (DGC). The density profiles of anthracite and meta-anthracite samples show an average density increase from 1.50 g/mL to 1.93 g/mL with increased rank. Components of partially graphitized coals were separated into two distinct density peaks: a low-density peak at ~1.82 g/mL, and a high-density peak at ~2.0 g/mL;
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Paleo-depositional environment, origin and characteristics of organic matter of the Triassic Chang 7 Member of the Yanchang Formation throughout the mid-western part of the Ordos Basin, China Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-11-07 Jinqi Qiao; Alireza Baniasad; Laura Zieger; Chen Zhang; Qun Luo; Ralf Littke
A comprehensive geochemical and petrographic study was performed on 23 clay-rich shale samples collected from 18 wells drilled in the western part of the Ordos Basin to investigate the characteristics and thermal maturity of organic matter as well as the paleo-depositional environment of the Chang 7 Member within the Triassic Yanchang Formation. The samples are characterized by moderate to very high
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A physics-based probabilistic forecasting methodology for hazardous microseismicity associated with longwall coal mining Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-11-02 Wenzhuo Cao; Sevket Durucan; Wu Cai; Ji-Quan Shi; Anna Korre
Mining-induced microseismicity is widely considered as a result of slippage of pre-existing critically stressed fractures caused by stress perturbations around an advancing face. An in-depth analysis of the recorded microseismicity associated with longwall top coal caving mining at Coal Mine Velenje in Slovenia has been previously carried out and reported by the authors. It has been concluded that
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Structure- and hydrology-controlled isotopic coupling and heterogeneity of coalbed gases and co-produced water in the Yanchuannan block, southeastern Ordos Basin Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-31 Yan Zhang; Song Li; Dazhen Tang; Xinglong Zhao; Shuangxi Zhu; Jincheng Ye
Gas and water geochemistry in the No.2 coal reservoir of the Yanchuannan CBM block in the southeastern Ordos basin reflects a complex interaction of tectonic, hydrodynamic, thermogenic, and biogenic processes. Stable isotope and component analyses of gas and water samples from the No. 2 coal seam of 17 CBM wells were performed to determine the correlations between stable isotopes of gases and co-produced
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On the common occurrence of sulphate with elevated δ34S in European mine waters: Sulphides, evaporites or seawater? Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-14 David Banks; Adrian J. Boyce; Neil M. Burnside; Ewa Janson; Nieves Roqueñi Gutierrez
The stable isotopic (δ34S, δ18O, δ2H) composition of mine waters has been examined from coal and metal mines, of varying depth, in Spain (Asturias), the UK (north Derbyshire/Yorkshire) and Poland (Bytom, Upper Silesia). δ18O and δ2H data confirm a meteoric origin for all waters. The mine waters have elevated sulphate concentrations relative to recent meteorically-derived groundwaters and have elevated
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Meso- and microporosity characteristics of Miocene lignite and subbituminous coals in the Kınık coalfield (Soma Basin, W. Turkey) Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-22 Ali Ihsan Karayigit; Rıza Görkem Oskay; Yılmaz Bulut; Maria Mastalerz
Three Miocene-age coal seams - a lower seam (kM2, subbituminous), a middle seam (kM3, subbituminous), and an upper seam (kP1, lignite) - in the Kınık coalfield, located in the southwesternmost part of the Soma Basin in western Turkey, and factors controlling mesoporosity and microporosity characteristics, were investigated using low-pressure N2 and CO2 adsorption techniques, respectively. In addition
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Geochemistry and organic petrology of the permian whitehill formation, Karoo Basin (RSA) and the Devonian/Carboniferous shale of the Appalachian Basin (USA) Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-09 V.P. Chabalala; N. Wagner; N. Malumbazo; C.F. Eble
Globally, there is significant economic interest in shale gas as a hydrocarbon resource. The success of unconventional shale gas exploration in the United State of America (USA) has raised interests for potential shale gas development in the Karoo Basin of South Africa. The Karoo Basin technically recoverable shale gas resource is estimated to be 13 Tcf, with 19–23 Tcf recoverable free gas. Due to
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Depositional environment, thermal maturity and shale oil potential of the Cretaceous Qingshankou Formation in the eastern Changling Sag, Songliao Basin, China: An integrated organic and inorganic geochemistry approach Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-19 Zibin Zhao; Ralf Littke; Laura Zieger; Dujie Hou; Felix Froidl
The Changling Sag in the petroliferous Songliao Basin has produced large amounts of conventional petroleum, but studies on unconventional resources are rare. A suite of core samples from the CY-1 well, drilled in the eastern Changling Sag, was analysed employing a series of micropetrographic, geochemical, and pyrolysis techniques to reveal the shale oil potential of the lower (K2qn1) and middle (K2qn2)
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Kinetics of hydrocarbon generation from the marine Ordovician Goldwyer Formation, Canning Basin, Western Australia Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-21 Lukman M. Johnson; Reza Rezaee; Gregory C. Smith; Nicolaj Mahlstedt; Dianne S. Edwards; Ali Kadkhodaie; Hongyan Yu
Pyrolysis and bulk kinetic studies were used to investigate the hydrocarbon generation potential and source rock organofacies variability of marine organic-rich rocks from the Middle Ordovician (Darriwilian) Goldwyer Formation in the Canning Basin, Western Australia. Rock-Eval pyrolysis results for the analysed immature to mid-mature calcareous mudstones imply that the upper Goldwyer Sequence I contains
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Impact of thermal maturity on the concomitant evolution of the ultrafine structure and porosity of marine mudstones organic matter; contributions of electronic imaging and new spectroscopic investigations Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-20 Amélie Cavelan; Mohammed Boussafir; Nathalie Mathieu; Fatima Laggoun-Défarge
This study aims to better understand the evolution of the organic matter (OM) ultrafine structure (designating the nanoscopic structure of the OM/macerals) and porosity with increasing thermal maturity of mudstones source-rocks. To this end, the particulate fractions of kerogen from organic-rich Kimmeridge clay mudstones were isolated by acidic treatment before and after laboratory thermal maturation
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Critical metal recovery potential of Appalachian acid mine drainage treatment solids Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-06 Benjamin C. Hedin; Robert S. Hedin; Rosemary C. Capo; Brian W. Stewart
Rare earth elements (REE) are critically important in clean energy technologies, but their mining and refining is energy intensive and generates significant quantities of environmentally harmful waste. The treatment of acid mine drainage (AMD), which is both a global environmental problem and a potential source of these elements, preconcentrates REE and critical metals such as manganese and cobalt
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Stimulation of methanogenesis in bituminous coal from the upper Silesian coal basin Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-06 Anna Pytlak; Anna Szafranek-Nakonieczna; Agnieszka Sujak; Jarosław Grządziel; Cezary Polakowski; Agnieszka Kuźniar; Kinga Proc; Adam Kubaczyński; Weronika Goraj; Anna Gałązka; Wiesław I. Gruszecki; Andrzej Bieganowski; Zofia Stępniewska
Biological methane production from coal seams through their biological conversion is one of the methods that have been postulated to utilize unmineable resources. Furthermore, energy production from methane is considered less environmentally-harmful than the combustion of coal. In the current study, meta-bituminous coal extracted from the Upper Silesian Coal Basin (USCB) was investigated in terms of
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Rare earth elements and yttrium in Pennsylvanian coals and shales in the eastern part of the Illinois Basin Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-15 M. Mastalerz; A. Drobniak; C. Eble; P. Ames; P. McLaughlin
The objective of this study was to evaluate rare earth elements and yttrium (REY) concentrations in Pennsylvanian coal-bearing strata in the eastern part of the Illinois Basin (Indiana), specifically targeting coals and marine shales associated with the coals. Samples were collected from several coal mines and three boreholes. In total, 105 samples were analyzed using inductively coupled plasma - optical
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Depositional controls on mineral assemblage and organic matter accumulation of upper Ordovician–lower Silurian mudstones in northwestern Guizhou area, China Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-08 Yingzhu Wang; Xing Liang; Jiehui Zhang; Zhuoheng Chen; Jijin Yang
The control of depositional conditions on sedimentary records spanning the Ordovician Wufeng–Silurian Longmaxi successions on the Yangtze Platform is not fully understood due to a lack of high-resolution faices analysis. This study aims to build a regional depositional model of this stratigraphic interval, to reveal the fundamental controls on the mineral assemblage and organic matter (OM) accumulation
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Depositional environment and thermal maturity of the coal-bearing Longtan Shale in southwest Guizhou, China: Implications for shale gas resource potential Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-01 Qian Zhang; Sebastian Grohmann; Xiaochen Xu; Ralf Littke
Significant knowledge has been assembled on the marine Longmaxi Shale in the Sichuan Basin over the past ten years. However, the distribution of shale gas resources on the periphery of the Sichuan Basin and in other source rock formations are still not sufficiently understood. To improve our understanding on the depositional environment and thermal maturity, and their relevance to the source rock quality
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Examination of inertinite within immature Eagle Ford Shale at the nanometer-scale using atomic force microscopy-based infrared spectroscopy Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-10-05 Aaron M. Jubb; Paul C. Hackley; Justin E. Birdwell; Javin J. Hatcherian; Jing Qu
The nanoscale molecular composition of sedimentary organic matter is challenging to characterize in situ given the limited tools available that can adequately interrogate its complex chemical structure. This is a particularly relevant issue in source rocks, as kerogen composition will strongly impact its reactivity and so is critical to understanding petroleum generation processes during catagenesis
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Isotherms and kinetics of deformation of coal during carbon dioxide sequestration and their relationship to sorption Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-09-30 Farui Shi; Zuoan Wei; Dongming Zhang; Gun Huang
An in-depth understanding of the carbon dioxide (CO2) sorption behavior on coal is critical for CO2 sequestration in coal seams and enhanced coalbed methane recovery. However, CO2 induces the deformation of coal through physical and/or chemical reactions during the CO2 injection process, which has a significant effect on the gas flow and stability of the coal seams. This study investigates the isotherms
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Geological controls on gas content distribution of coal seams in the Kınık coalfield, Soma Basin, Turkey Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-09-21 Olgun Esen; Samet Can Özer; Anıl Soylu; Ata Ramazani Rend; Abdullah Fişne
The Miocene Soma Coal Basin may be one of the most promising areas for low-rank coalbed methane in Turkey. So far, the coalbed methane potential of the coal seams in the Kınık Coalfield, Soma Basin has not been adequately studied. A systematic investigation was performed on the gas content distribution of the kP1 and kM2 coal seams and its geological controls, which has been based on the geological
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A novel NMR surface relaxivity measurements on rock cuttings for conventional and unconventional reservoirs Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-09-24 Lateef Owolabi Lawal; Abdulrauf R. Adebayo; Mohamed Mahmoud; Ben Mansour Dia; Abdullah S. Sultan
Surface relaxivity (ρ) is an intrinsic rock property that makes low-field NMR a valuable tool for determining pore size distribution of geological formations. Its value can vary considerably in different rocks depending on the type and distribution of the rock minerals, rock surface wettability and petrophysical properties. Therefore, laboratory measurement of ρ is required on a case by case basis
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Geological controls on the distribution of REY-Zr (Hf)-Nb (Ta) enrichment horizons in late Permian coals from the Qiandongbei Coalfield, Guizhou Province, SW China Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-09-20 Baoqing Li; Xinguo Zhuang; Xavier Querol; Natalia Moreno; Patricia Córdoba; Yunfei Shangguan; Linjian Yang; Jing Li; Feng Zhang
The abnormal enrichment of the REY (rare earth elements and yttrium)-Zr (Hf)-Nb (Ta) assemblage in Late Permian coals occurring in some coalfields in SW China has been extensively investigated, but the geological controlling factors of this assemblage are still under debate. This study reports on the mineralogical and geochemical features of coals and noncoal rocks collected from the Yudai and Jinqi
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Geochemistry of dolomite fluorescence in response to thermal maturity: An example from Upper Ordovician Utica Shale of southern Québec, Canada Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-09-19 Omid H. Ardakani; Hamed Sanei; Simon E. Jackson; Ihsan S. Al-Aasm
This study presents results of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) elemental analysis of scattered dolomite crystals in the Upper Ordovician Utica Shale of southern Québec to investigate the geochemical cause(s) of color variation in dolomite fluorescence and its possible relationship to thermal maturity. Utica Shale dolomite crystals show fluorescence zonation under
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Could hot fluids be the cause of natural pyrolysis at the ragged edge of Herrin coal, Millport 7 ½’ quadrangle, Hopkins County, Kentucky? Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-09-20 Bruno Valentim; Helena Couto; David French; Suzanne D. Golding; Fernanda Guimarães; Alexandra Guedes; Jennifer M.K. O’Keefe; Anne L. Raymond; Cláudia Santos; Alireza Valian; Colin R. Ward; James C. Hower
The Herrin coal (Western Kentucky No. 11) “ragged edge” is composed of peculiar organic materials, including voids, which defy conventional maceral classification. These materials seem to have originated from natural pyrolysis caused by hot fluids migrating through low-rank coal. However, the observed petrographic patterns and the reflectance analysis were not enough to confirm this hypothesis. In
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In situ techniques for classifying apatite in coal Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-08-03 Brooke A. Davis; Sandra Rodrigues; Joan S. Esterle; Llew Rintoul; Alex J. Duxbury; Sue D. Golding
Calcium phosphate apatite, Ca5 (PO4)3(OH,F,Cl), is a common accessory mineral in coal seams. Although minor, its role in hosting phosphorus (P) and fluorine (F) can reduce the economic viability of coking and thermal coal deposits. Apatite in coal is commonly <50 μm and may have several modes of occurrence. The modes of occurrence investigated as part of this study include apatite infilling small (i
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Organic facies variability and paleoenvironmental changes on the Moroccan Atlantic coast across the Cenomanian—Turonian Oceanic Anoxic Event (OAE2) Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-08-26 Carolina Fonseca; João Graciano Mendonça Filho; Carine Lézin; Luís V. Duarte
The Cenomanian—Turonian boundary is marked by worldwide paleoenvironmental and paleoceanographical changes that are associated with a perturbation of the global carbon cycle and black shale deposition, called the Oceanic Anoxic Event 2 (OAE2). The objective of this study is to precisely characterize the nature of the organic matter, its variability, paleoenvironmental significance and the preservation
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Nanoparticles from evaporite materials in Colombian coal mine drainages Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-09-01 Luis F.O. Silva; James C. Hower; Guilherme L. Dotto; Marcos L.S. Oliveira; Andrea L. Moreno
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Differential evolution and the influencing factors of low-maturity terrestrial shale with different types of kerogen: A case study of a Jurassic shale from the northern margin of Qaidam Basin,China Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-09-16 Yunpeng Zhang; Yuhong Li; Wang Guo; Yonghong Li; Hongliang Dang
The Jurassic terrestrial shale on the northern margin of Qaidam Basin is characterized by high contents of organic matter but low maturity resulting in a lack of further research on shale gas in this area. To better understanding the shale gas potential of organic matter with different types, we conducted thermal maturity experiment of hydrocarbon generation from different kerogen types of low-mature
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Co-occurrence of charcoal, polycyclic aromatic hydrocarbons and terrestrial biomarkers in an early Permian swamp to lagoonal depositional system, Paraná Basin, Rio Grande do Sul, Brazil Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-09-15 Rafał Kubik; Leszek Marynowski; Dieter Uhl; André Jasper
The Permian period had the most oxygen-rich atmosphere in Earth's history. With the presence of large amounts of fuel from vegetation, there was therefore a high probability of igniting fires during this time. This study presents the geochemical characterization of charcoal-bearing Asselian sediments, represented by terrestrial to lagoonal facies, collected from the Quitéria and Curva do Belvedere
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Petrographical and petrophysical characterization of the late cretaceous Naparima Hill Formation, Central Range, Trinidad, West Indies Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-09-17 U.C. Iyare; R. Ramsook; O.O. Blake; D.R. Faulkner
The late Cretaceous Naparima Hill Formation in the South Trinidad Basin (southeast Caribbean) is a prolific source rock with a potential for unconventional hydrocarbon exploration. It is exposed across the Central Range and extends to the city of San Fernando. This study characterized the Naparima Hill source rock using petrographic analysis techniques (X-ray diffraction and thin section analysis)
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Mining geology of the principal resource coals of the Illinois Basin Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-09-12 Stephen F. Greb; W. John Nelson; Scott D. Elrick
The Middle Pennsylvanian Herrin and Springfield coals contain the majority of the Illinois basin’s resources. Many mining issues of these two seams are directly related to the geology of the region, including regional stress, faulting, and facies changes. Some of these conditions are widespread, while others are locally restricted. The long history of mining in these seams has been associated with
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Differences in CH4 and C2H6 carbon isotopic compositions from open and closed pores in coal: Implications for understanding the two-stage δ13C shift during canister desorption Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-08-27 Yilin Chen, Bo Zhang, Yong Qin, Zhongping Li, Zhaobiao Yang, Caifang Wu, Chunhui Cao
Canister desorption of freshly drilled coal cores is routinely employed for exploratory assessments of coalbed gas. Coals are molecular sieves containing both open and closed pores. However, little attention has been paid to the differences between the carbon isotopic compositions of CH4 and C2H6 from open and closed pores in coal and their influence on isotopic fractionation during desorption. In
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Formation of coalbed methane and water-dissolved gas in Kushiro Coal Mine, Japan, based on isotopic compositions of gas, groundwater, and calcite Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-08-17 Shuji Tamamura, Takuma Murakami, Akio Ueno, Satoshi Tamazawa, Tamotsu Kiyama, Hidenori Inomata, Hiroyuki Matsumoto, Kagemi Uchida, Yoshiaki Suzuki, Jun Aizawa, Katsuhiko Kaneko
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Kerogen composition and maturity assessment of a solid bitumen-rich and vitrinite-lean shale: Insights from the Upper Jurassic Vaca Muerta shale, Argentina Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-08-14 Henrik I. Petersen, Hamed Sanei, Francois Gelin, Emilie Loustaunau, Valerie Despujols
Assessment of thermal maturity by solid bitumen reflectance measurements in vitrinite-lean or vitrinite-barren shales is widely used in unconventional shale gas and shale oil plays but the method is commonly challenged by the complexity in the measurements. The Upper Jurassic marine Vaca Muerta shale in the Neuquén Basin in western Argentina is both a prolific conventional source rock and a primary
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History of applied coal petrology in the United States. IV. Reflections on the centennial of the introduction of coal petrology to North America Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-08-14 James C. Hower, Cortland F. Eble, Jennifer M.K. O'Keefe
Reinhardt Thiessen introduced a thin-section-based, botanically oriented method of coal petrology to North America in 1920. The nomenclature derived from this system, although eventually reconciled with and largely superseded by the European reflected-light techniques and nomenclature, persisted for decades after Thiessen's death in 1938. The research by Thiessen and his colleagues at the U.S. Bureau
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Mechanical characterization of shale matrix minerals using phase-positioned nanoindentation and nano-dynamic mechanical analysis Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-08-06 Chao Yang, Yongqiang Xiong, Jianfeng Wang, Yun Li, Wenmin Jiang
The accurate determination of mechanical parameters (namely, Young's modulus and hardness) of shale-constitutive minerals is crucial for predicting the macroscale mechanical parameters of shale composites. This study employed an advanced nanoindentation apparatus equipped with a high-resolution microscope (4000×) and a newly emerging nano-dynamic mechanical analysis (nano-DMA) module to conduct mineral-positioned
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Kerogen assemblages and δ13CKerogen of the uppermost Pliensbachian–lower Toarcian succession of the Asturian Basin (northern Spain) Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-08-03 Bruno Rodrigues, Ricardo L. Silva, João Graciano Mendonça Filho, M.J. Comas-Rengifo, A. Goy, Luís V. Duarte
The Toarcian Oceanic Anoxic Event (TOAE) is characterised by a perturbation of the global carbon cycle and the widespread deposition of organic matter (OM)-rich strata/sediments in the northern areas of the West Tethys Shelf, in several northern European epicontinental basins. Contrariwise, in the southern areas of the West Tethys Shelf such as western and southern Iberian, and northern Gondwana margins
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Organic matter variation within Upper and Lower Bakken shales of the Williston Basin by extracting kerogen pyrogram information Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-08-03 Xiaojun Liu, Stephan H. Nordeng, Zhuoheng Chen, Chunqing Jiang, Andy Mort
Activation energy distribution from kerogen kinetics study contains some integral characteristics of the host source rock thermal history over geological time scales. Extracting relevant information from pyrogram is critical for reconstruction of source rock maturation and hydrocarbon generation histories. In this study, in order to improve understanding of the Bakken shale source rock, we present
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Pore scale study of gas sorption hysteresis in shale nanopores using lattice Boltzmann method Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-08-01 Rui Xu, Maša Prodanović, Christopher Landry
Tremendous amount of gas can be adsorbed in shale nanopores as a result of the high surface-to-volume ratio, and capillary condensation might occur in mesopores (2–50 nm) for subcritical gases, leading to sorption hysteresis. However, the sorption (adsorption and desorption) behavior in different pore systems in shale is not very well understood. Herein we use a D3Q19 lattice Boltzmann model (LBM)
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Optical parameters and microstructural properties of Solid Bitumens of high reflectance (Impsonites). Reflections on their use as an indicator of organic maturity Int. J. Coal Geol. (IF 5.692) Pub Date : 2020-07-31 Isabel Suárez-Ruiz, Tatiana Juliao, Sandra Rodrigues, Ignacio Camean
Six solid bitumen samples from Paja Formation (Cretaceous of Colombia) were optically, chemically and structurally characterized using bulk chemistry, reflectance indicating surface (RIS), micro-Raman and X-ray diffraction (XRD) parameters. The volatile matter and carbon contents and high random reflectance (Ro%) placed these solid bitumens in the category of cata-impsonites according to Jacob's classification
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