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Nanomechanical properties of anthracite and graphite: The role of heteroatom functional groups and structural evolution Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-02-06 Yuhui Wang, Suping Yao, Hanlin Zheng, Zhaoxi Zuo, Yang Liu
This study investigates the anthracite and graphite samples from the Hanpoao mining area in Hunan Province, China, to understand their structural deformation characteristics in relation to tectonic stress and magmatic intrusion. Despite previous research highlighting the influence of tectonic stress on the microcrystalline structure of organic matter, there remains a gap in comprehensively understanding
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Intelligent identification of coal macerals using improved semi-supervised semantic segmentation methods Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-02-02 Na Xu, Qingfeng Wang, Pengfei Li, Jiapei Kong, Qing Li, Mark A. Engle, James C. Hower, Wei Zhu
Recently, the demand for automatic coal maceral identification has gradually received much attention, and hence deep learning has been applied to the identification of coal macerals. However, a large number of labels are necessary for supervised learning, which imposes challenges for automatic coal maceral identification. In this study, the methods for identifying coal macerals were fully reviewed
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Mechanisms of strain rate-dependent response of naturally fractured coal Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-02-01 Linan Su, Hamid Roshan
The mechanical characteristics of naturally fractured coal under strain rate-dependent loadings can affect engineering activities such as coal seam gas production, gas drainage and CO2 sequestration. While the macro-(core) scale strain-rate dependent response of fractured coal has been investigated previously, the micro-scale mechanisms driving this core-scale behaviour particularly under recoverable
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The effect of high pressure on hydrocarbon generation from Type-I kerogen source rocks: Implications for petroleum system evolution Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-01-31 Ahmed Khairy, Clement N. Uguna, Christopher H. Vane, Waleed Sh. El Diasty, Kenneth E. Peters, Colin E. Snape, Sherif Farouk, Will Meredith
This study examines the effect of high water pressure (up to 900 bar) on hydrocarbon generation from Type-I kerogen-rich source rocks and compares the results with previously observed effects on Type-II and Type-III kerogens. An immature Type-I oil shale sample from the Duwi Formation, Egypt, was pyrolysed under anhydrous, low-pressure hydrous, and high water-pressure conditions at 320 °C (end of bitumen
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Element geochemical characteristics for the roof and floor rocks of coal seams in the Shendong mining area: Emphasis on hazardous element fluorine Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-01-30 Zheng Zhang, Guoqing Li, Lei Wang
The Shendong mining area produces over 200 million tonnes of coal annually, resulting in notable gangue output, including materials from coal roof, floor and gangue itself. The hazardous elements, particularly fluorine (F), present in the gangues pose challenges for energy utilization and safe use of mine water. Despite this, studies on the elemental geochemical characteristics of gangues in the Shendong
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Organic matter accumulation, paleoenvironment and kerogen structure of the Middle Jurassic Dameigou Formation, Qaidam Basin: Evidence from organic petrography and geochemistry Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-01-28 Zhongrui Wu, Ralf Littke, Tianxu Guo, Sheng He, Sebastian Grohmann
The organic matter in terrestrial sediments provides not only a record of geological events but is also as a vital source of fossil fuels. Its enrichment is fundamentally governed by the interplay of complex depositional environments and diverse climatic conditions. This study presents an integrated investigation utilizing major element oxides, trace elements, rare-earth elements, organic petrography
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Geochemistry of tonsteins and its implications for Li-Zr (Hf)-Nb (Ta) enrichments in Cisuralian coal seams, Shanxi Province, North China Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-01-27 Zhanming Guo, Beilei Sun, Chao Liu, Mingyuan Lei, Xu Wang, Yao Wang
Altered volcanic ashes within coal and coal-bearing sequences, often occurring as persistent bands embedded within coal seams (generally as tonsteins), can characterize the geochemical features and hence quality of coal. This study investigates the mineralogical and geochemical features of tonsteins within the coal seams from Shanxi Formation, North China in order to define the critical elements enrichments
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Rare Earth Elements – Recovery from Coal-Based Materials by Stephen Mills, 2024. Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-01-25 James C. Hower
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Climatically-driven cessation of coal formation in tropical Pangea around the Pennsylvanian-Permian boundary; an example from alluvial-lacustrine succession of the Líně Formation (Czechia) Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-01-23 Roland Nádaskay, Stanislav Opluštil, Karel Martínek, Zbyněk Šimůnek, Jaroslav Zajíc, Jana Drábková, Petra Podzimková, Ivana Sýkorová
Increasing climatic seasonality within tropical Pangea during the Pennsylvanian–Permian transition had a significant impact on landscape habitat and terrestrial biota evolution. One of the important consequences was cessation of peat formation in tropical Pangea – an underexplored issue because successions of this age in major European coalfields are either not preserved or are stratigraphically poorly
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Climatic reconstruction of the Late Palaeocene using sedimentary archives from the Bikaner-Nagaur Basin, Rajasthan, India Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-01-23 Dinesh Kumar, Tushar Adsul, Ofentse M. Moroeng, Zoremsiami Pachuau, Ashutosh Panigrahi, Santanu Ghosh, Asmita Datta, Rupayan Sen, Atul Kumar Varma
The present study examines Late Palaeocene climatic changes recorded in the shale-lignite‑carbonaceous shale sequence of the Bikaner-Nagaur Basin, Rajasthan, India. Various analytical methods such as organic petrography, stable isotopes of organic carbon (δ13Corg), organic carbon to total nitrogen ratio (Corg/TN), Rock-Eval parameters, and Fourier transform infrared spectroscopy are employed to investigate
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Dynamic evolution and differential enrichment of deep coalbed methane: A case study in Qinshui Basin Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-01-21 Xiongxiong Yang, Shuheng Tang, Zhaodong Xi, Songhang Zhang, Qian Zhang, Ke Zhang, Donglin Lin, Jing Wang
Gas content is a critical factor in evaluating the resource potential and predicting the productivity of deep coalbed methane reservoirs. This study investigates the evolution of gas content in deep coal reservoirs over geological time and explores models of differential gas enrichment. Using Carboniferous-Permian deep coal reservoirs in the Yushe-Wuxiang block of the Qinshui Basin as a case study
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The geochemical and organic petrological characteristics of kolm (upper Cambrian, Sweden): Implications for genesis Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-01-12 Anji Liu, Niels Hemmingsen Schovsbo, Arne Thorshøj Nielsen, Qingyong Luo, Ningning Zhong, Leibo Bian, Xiaowei Zheng, Rasmus Andreasen, Hamed Sanei
Kolm refers to uraniferous (1280–7100 ppm) and organic-rich (25–71 wt%) lenses occurring exclusively within the Furongian part of the Alum Shale Formation in south-central Sweden. It typically less than 7 cm thick and forms thin discontinuous layers. This study investigates the geochemical and organic petrological characteristics of kolm, and it is shown that the organic matter likely represents secondarily
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Wood-degrading fungal origin of perylene in peatlands of southern Poland: A molecular and statistical approach Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-01-10 J. Smolarek-Lach, E. Szram, K.J. Wójcicki, L. Marynowski
Perylene is a polycyclic aromatic hydrocarbon (PAH) whose origin remains enigmatic. It has been thought to be derived from hydrocarbons, however much uncertainty remains over whether it is natural or anthropogenic. In this study, a comprehensive study of peat was conducted in the Osobłoga and Kłodnica River Valleys of southern Poland. Here, we show a significant advance in our understanding of the
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Horgen-Käpfnach, the largest Swiss coal deposit: Geology, petrology and geochemistry Int. J. Coal Geol. (IF 5.6) Pub Date : 2025-01-06 R.F. Sachsenhofer, V. Aghayeva, S. Ajuaba, I. Kojić, D. Misch, K. Stojanović
The Miocene Käpfnach seam is only about 0.5 m thick but offers interesting insights into the depositional environments during the early stages (∼16 Ma) of the deposition of the Upper Freshwater Molasse in the Swiss part of the North Alpine Foreland Basin. It is also the most important coal deposit in Switzerland. The study focused on the coal seam, which includes a marly parting (“Stinkstein”), but
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Coalbed gas: A review of research directions from the past to the future as facilitated by bibliometrics Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-12-31 Romeo M. Flores, Tim Moore
This bibliometric review used coalbed gas articles published in the International Journal of Coal Geology (IJCG) from 1986 to 2022 catalogued in the Scopus database to compare similar articles indexed in the Web of Science (WoS) database from 1999 to 2016. Comparison focused between highly cited articles (top 1 % versus >100 citations in the WoS and Scopus databases, respectively) from the 2007–2016
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Valley So Low: One Lawyer’s Fight for Justice in the Wake of America’s Great Coal Catastrophe, by Jared Sullivan, 2024. Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-12-26 James C. Hower
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Elemental geochemical insights into sediment sources, influx variations and depositional environment changes in the Eocene–Miocene Lark Formation, Danish North Sea Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-12-22 Zhiheng Zhou, Qingyong Luo, Niels Hemmingsen Schovsbo, Henrik Ingermann Petersen, Arka Rudra, Hamed Sanei
The Lark Formation in the Danish North Sea holds great paleoenvironmental interest for understanding climatic and tectonic impacts on sediment supply and depositional environment during the latest Eocene to the Middle Miocene. This study investigates sediment provenance, variations in sediment flux, chemical weathering intensity, and redox conditions in relation to these climatic and tectonic events
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Noble gases in Paleozoic shale fluids document tectonic events and fluid migration in the Upper Yangtze Block Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-12-17 Rui Liu, Tao Wen, Daniele L. Pinti, Rui Xu, Fang Hao, Shang Xu, Zhiguo Shu
Major and noble gases of natural gas extracted from the low-permeability Paleozoic Wufeng-Longmaxi shale were measured to reconstruct the multi-stage, spatially varying tectonic evolution of the Upper Yangtze Block, China, one of the oldest parts of the Earth continents. The high gas dryness ratio [C1/(C2 + C3)] and high carbon isotopic ratios (δ13C-C1, δ13C-C2, δ13C-CO2) suggest a late mature thermogenic
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Matrix permeability anisotropy of organic-rich marine shales and its geological implications: Experimental measurements and microscopic analyses Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-12-12 Yong Ma, Huiting Hu, Zhejun Pan, Ningning Zhong, Fujie Jiang, Chengyu Yang, Jianbin Ma, Binhao Feng
Due to the presence of natural and/or preparation-related fractures, the anisotropy of the matrix permeability of shales is usually difficult to characterize. In this study, we used X-ray micro-computed tomography (XRμCT) imaging to select samples from the Lower Cambrian and Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation of the Upper Yangtze Platform, China, showing no
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Organic modes of occurrence and evolution mechanism of germanium and lithium in coal: Insights from density functional theory Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-12-04 Ruifeng Mu, Shaoqing Wang, Xiaoling Wang, Haofan Su, Yan Shao
Critical elements in coal, such as Ge and Li, recently have attracted attention due to their economic significance. Modes of occurrence of these critical elements are academically and practically important, because they can not only provide evidence for sources of elements and minerals in coal and regional geological background information, but also help with design of recovery methods. However, conventional
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Staged evolutionary features of the aromatic structure in high volatile A bituminous coal (hvAb) during gold tube pyrolysis experiments Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-12-04 Wenbin Yang, Pal Toth, Yu Song, Wu Li
Low-temperature pyrolysis of coal is a crucial step in the coal thermal conversion process and involves very complex physical and chemical reactions that can have different effects on the coal's structure. The thermal evolution behavior and transformation mechanism of the coal microstructure are not yet fully understood, which also limits the efficient utilization of coal to a certain extent. The aromatic
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Organic petrology and geochemistry of the late Neogene Shizigou Formation in the Qaidam Basin, China: Characteristics of a prospective microbial gas source rock Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-19 Jinqi Qiao, Qingyong Luo, Shouxin Guo, Xianglu Tang, Ludmila Kopaevich, Ralf Littke
The discovery of natural gas trapped in the late Neogene Shizigou Formation in the Yikeyawuru anticline indicates the potential for additional microbial gas reservoirs outside of the primary exploration targets for microbial gas in the younger, i.e., the Pleistocene sediments of the Qaidam Basin. In this study, a detailed investigation is presented on the bulk geochemistry and organic petrography of
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Anomalies in Vicker's microhardness of subbituminous and high volatile bituminous coals Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-19 Saeed Chehreh Chelgani, James C. Hower, Maria Mastalerz, Susan M. Rimmer
Vickers microhardness (MH) of coal is known to be strongly correlated with coal rank. To examine coal rank and other coal quality parameters, such as organic sulfur, that might influence MH, a suite of more than 300 samples from the Penn State Coal Quality database with vitrinite Rmax < 1.1 % were examined. The data set was narrowed down to 296 coals with moisture (as-received basis) < 20 %. As MH
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Corrigendum to “Characteristics of the low-pressure spatial and temporal distributions of oil- and gas-bearing layers in the Ordos Basin, China” [Int. J. Coal Geol. 2024 (285) 104476]. Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-12 Yang Qin, Chiyang Liu, Lei Huang, Jianqiang Wang, Junfeng Zhao, Deyong Shao, Lihua Yang, Xiaochen Zhao, Ehsan Khalaf, Shaohua Zhang, Nan Du
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Deep syntectonic burial of the Anthracite belt, Eastern Pennsylvania Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-08 Mark A. Evans, Aaron M. Jubb
Fluid inclusion microthermometry and Raman spectroscopy of fluid inclusions in quartz veins from the Pennsylvanian rocks of the Anthracite belt, eastern Pennsylvania support a deep burial model of coalification in favor of focused orogenic hot fluid flow. High-temperature (250 to 255 °C) trapping of CH4 ± CO2 saturated aqueous fluids and CH4 ± CO2 inclusions indicate fluid trapping at depths of 11
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The effects of sample preparation on the interpretation of pyrolysis-based organic matter analysis in immature oil shale Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-07 Zibin Zhao, Ralf Littke, Christoph Hartkopf-Fröder
Oil shale as well as shale oil and shale gas are significant energy resources with huge reserves present in different parts of the world. Various geochemical proxies have been applied to assess the petroleum potential of oil shales with samples pre-treated in various ways, e.g. as whole rock or demineralized sample or as solvent extracted rock/kerogen. In this respect, it is important to understand
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Influence of tectonic evolution processes on burial, thermal maturation and gas generation histories of the Wufeng-Longmaxi shale in the Sichuan Basin and adjacent areas Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-07 Shuyong Shi, Yunpeng Wang, Chengsheng Chen, Jinzhong Liu, Ping'an Peng
The Wufeng-Longmaxi (WL) shale is widely distributed in the Sichuan Basin and adjacent areas in southwest China. The basin experienced multiple-stage complex tectonic movements, whose influences on burial, thermal maturation and gas generation histories in different areas are poorly understood. Based on a detailed study of the denudation stages, strata thickness, and thermal history of the basin, burial
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Devolatilization behaviour of Kolubara and Kostolac lignite (Serbia) during the combustion process: A case study Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-07 Miodrag Životić, Nenad Nikolić, Dragoslava Stojiljković, Danica Bajuk-Bogdanović, Dragana Životić
In this study the devolatization behaviour of lignite samples, of various grain sizes, on a wire mesh reactor is evaluated. Lignite samples were rapidly heated at four different temperatures (300, 500, 700 and 900 °C). The feed lignite reveals a high content of huminite, a low inertinite and liptinite contents in the Kostolac samples and a slightly higher liptinite content in the Kolubara samples.
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Palynofacies as sea-level-sensitive proxy in Early Cretaceous marine mudstones – A critical evaluation Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-06 Hauke Thöle, Ulrich Heimhofer, André Bornemann, Jochen Erbacher
Stratigraphic distribution patterns of particulate organic matter (POM) have been widely used for facies recognition and paleoenvironmental interpretation as well as to decipher proximal to distal trends within fine-grained sediments. The Lower Cretaceous mudstone-dominated succession in the eastern Lower Saxony Basin (LSB) offers an excellent opportunity to critically evaluate such palynofacies parameters
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Coke-based proppant for coalbed methane technology Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-05 Rafał Morga, Krzysztof Labus, Tomasz Suponik
The production of ultra-light weight coke proppants for fracturing coal bed methane deposits is presented. The raw material is blast-furnace coke, foundry coke and a coke breeze. The method used obtains coke proppants that meet all the requirements of the ISO 13503-2:2006/Amd.1:2009 standard for proppants used in hydraulic fracturing, with the exception of crush resistance. They have porosity up to
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Net primary productivity of paleo-peatlands linked to deep-time glacial periods in the late Carboniferous and early Permian icehouse interval Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-04 Yanwen Shao, Fenghua Zhao, Baruch Spiro, Dehui Li, Guangyuan Mu, Jiangman Chu, Jing Lu, Longyi Shao
Peatlands, an important organic carbon reservoir, play a crucial role in the global carbon cycle. The carbon accumulation of peatlands, reflected by net primary productivity (NPP), can have an impact on global carbon cycling and climate change. The late Carboniferous - early Permian is an icehouse period, during which numerous thick coal beds were accumulated in the North China Block (NCB) located
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Effects of thermal intrusion on biomarker distributions in the Alum Shale from south-central Sweden Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-03 Anji Liu, Qingyong Luo, Arka Rudra, Niels Hemmingsen Schovsbo, Xiaowei Zheng, Zhiheng Zhou, Hamed Sanei
The middle (Miaolingian) to upper (Furongian) Cambrian Alum Shale Formation in the DBH15/73 core from south-central Sweden was exposed to local heat from a diabase intrusion, providing an opportunity to investigate the molecular geochemical response to thermal stress. Organic petrological observations and biomarker analyses were conducted to study changes in maturity-indicating parameters and the distribution
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Disentangling causes of the limestone-marl bedding couplets in the Bridge Creek Limestone Member of the Greenhorn Formation through an integrated sedimentological and organic petrology analysis Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-11-01 Zhiyang Li, Maria Mastalerz
Although limestone-marl bedding couplets in the Cenomanian-Turonian Bridge Creek Limestone (BCL) have been widely attributed to changes in environmental conditions ultimately driven by Earth's orbital cycles, the causes of short-term variations in organic matter (OM) enrichment and composition (i.e., types and proportions of different macerals) in the bedding couplets through the BCL have rarely been
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Tungsten (W) geochemistry in north Asian coals (Siberia, Russian far east and Kazakhstan) Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-28 S.I. Arbuzov, I.Yu. Chekryzhov, V.I. Vyalov, D.A. Spears, A.S. Kholodov, N.Yu. Popov
This research discusses new data on the geochemistry of tungsten (W) in the coals of North Asia (Siberia, the Russian Far East, and Kazakhstan), based on analyses of over two thousand samples. In general, the studied coals are enriched in W in comparison with the average value for coals all over the world. In different regions of the studied area, coal deposits with anomalous W concentrations (up to
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Substantial gas enrichment in shales influenced by volcanism during the Ordovician–Silurian transition Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-24 Yujie Yuan, Songtao Wu, Emad A. Al-Khdheeawi, Jingqiang Tan, Zhuo Feng, Zhenjiang You, Reza Rezaee, Han Jiang, Jun Wang, Stefan Iglauer
The substantial gas enrichment in shales of the Ordovician–Silurian transition is associated with the development of the organic matter (OM)-rich source rock. While organic matter enrichment has been linked to intensive volcanism, it remains a challenge to precisely evaluate the impact of the volcanism on substantial gas enrichment containing the largest gas storage capacity. This study focused on
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Differential mineral diagenetic evolution of lacustrine shale: Implications for CO2 storage Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-21 Liu Wang, Bo Liu, Longhui Bai, Lin Ma, Zhichao Yu, Qiuli Huo, Kevin G. Taylor
Understanding the differential diagenetic evolution of different lithofacies is essential for assessing the spatial development of shale reservoirs. These insights are crucial in predicting sealing integrity and storage capacity for sequestered CO2. In this study, we examined seven wells from the Cretaceous Qingshankou Formation in the Songliao Basin, China, with vitrinite reflectance (Ro) values ranging
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Petrographic and geochemical signatures of the Upper Permian Gondwana coals: Newcastle Coal Measures, Northern Sydney Basin, Australia Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-20 Angelos G. Maravelis, Konstantinos Perleros, Evangelia Papandropoulou, Elina Chamilaki, Nikos Pasadakis, Stavros Kalaitzidis, Avraam Zelilidis
This research presents an integrated approach to organic petrographical and geochemical characteristics of the Upper Permian Newcastle Coal Measures outcropping in the northern Sydney Basin, southeast Australia. Twenty-seven coal, coaly mudstone and mudstone samples were collected and analyzed by using organic petrography (maceral composition and vitrinite reflectance) techniques, Rock–Eval pyrolysis
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Paleoenvironmental reconstruction of coal deposition during the Cretaceous-Paleogene transition in the Eastern Cordillera Basin, Colombian Andes Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-20 Juan Sebastian Gomez-Neita, Ana Maria Pimentel Mizusaki, Taís Freitas da Silva, Sandra Rocio Manosalva-Sánchez, Jorge Eliecer Mariño-Martínez
Stratal stacking patterns and factors influencing peat accumulation in coastal and continental settings represent a significant problem in studying coal-bearing sequences. To address this issue, this work focused on the Cretaceous-Paleogene Guaduas Formation on the Checua-Lenguazaque Syncline (CLS) coalfield in the Eastern Cordillera Basin (Colombian Andes). This study relies on geological survey,
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Spatial distribution of remaining movable and non-movable oil fractions in a depleted Maastrichtian chalk reservoir, Danish North Sea: Implications for CO2 storage Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-20 Henrik I. Petersen, Kasper H. Blinkenberg, Kresten Anderskouv, Arka Rudra, Xiaowei Zheng, Hamed Sanei
Depleted oil and gas fields constitute potentially important storage sites for CO2 in the subsurface, but large-scale injection of supercritical (sc) CO2 in chalk has not yet been attempted. One of the risks is the adverse effect of the substantial amount of remaining oil in the chalk reservoirs on scCO2 injection. In order to counter an undesired effect on injectivity, a fundamental understanding
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Mitigating climate change by abating coal mine methane: A critical review of status and opportunities Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-20 C. Özgen Karacan, Robert A. Field, Maria Olczak, Malgorzata Kasprzak, Felicia A. Ruiz, Stefan Schwietzke
Methane has a short atmospheric lifetime compared to carbon dioxide (CO2), ∼decade versus ∼centuries, but it has a much higher global warming potential (GWP), highlighting how reducing methane emissions can slow the rate of climate change. When considering the contribution of greenhouse gas (GHG) emissions to current global warming (2010–2019) relative to the industrial revolution (1850–1900) levels
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Organic petrographic and geochemical insights into organic matter derived from land plants and marine algae in the Lark Formation, Danish North Sea Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-19 Zhiheng Zhou, Qingyong Luo, Arka Rudra, Henrik Ingermann Petersen, Niels Hemmingsen Schovsbo, Hamed Sanei
Climatic fluctuations from the Eocene to the Miocene highlight the importance of investigating the paleoenvironment of the latest Eocene to the Middle Miocene Lark Formation in the Danish North Sea. This study investigates immature sedimentary organic matter in the Lark Formation using 54 cuttings samples and one core sample collected from seven wells in the eastern North Sea Basin. Organic petrography
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An improved convolutional architecture for quantitative characterization of pore networks in fine-grained rocks using FIB-SEM Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-19 Bo Liu, Qamar Yasin, Mengdi Sun, Atif Ismail, David A. Wood, Xin Tian, Baiquan Yan, Li Fu
Focused ion beam scanning electron microscope (FIB-SEM) is one of the most advanced imaging techniques for analyzing and understanding complex pore networks in shale and other fine-grained formations. However, FIB-SEM imaging tends to be time-consuming and labor-intensive and can result in biased interpretations associated with pore analysis. Recently, U-Net or its variants for image segmentation have
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Geological and hydrological controls on the pressure regime of coalbed methane reservoir in the Yanchuannan field: Implications for deep coalbed methane exploitation in the eastern Ordos Basin, China Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-18 Xiaoming Wang, Shihui Hou, Xingjin Wang, Yudong Yuan, Zheng Dang, Mingkai Tu
The pressure regimes of the No. 2 coalbed methane (CBM) reservoir in the Yanchuannan field located in the southeastern Ordos Basin are highly variable and divided into overpressured (pressure gradient >9.80 kPa/m), slightly underpressured (pressure gradient of 8–9.80 kPa/m), and moderately underpressured (pressure gradient of 5–8 kPa/m). The controlling factors for the variable pressure regimes were
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Calcite U[sbnd]Pb dating and geochemical constraints on fracture opening in organic-rich shales Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-17 Dadong Liu, Hui Tian, Chengzao Jia, Qingqing Fan, Xuesong Lu, Mingyang Xu, Yan Song, Chen Zhang
Gas-bearing, organic-rich shales commonly host numerous opening-mode fractures; however, their formation mechanism remains controversial, with competing arguments of tectonic-origin and/or hydrocarbon generation pressurization-origin. Here, we studied fracture fillings in shale reservoirs of the lower Silurian Longmaxi Formation in the Luzhou area, southern Sichuan Basin, SW China. Using in-situ UPb
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Petroleum evolution and its genetic relationship with the associated Jinding Pb[sbnd]Zn deposit in Lanping Basin, Southwest China Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-16 Xiang Ge, Jiajia Xiang, Yulin Jin, Wenpan Cen, Guangyou Zhu, Chuanbo Shen
The spatial association of hydrocarbons with metalliferous ore deposits is found worldwide and is particularly common to MVT PbZn deposits. Heavy oil and bitumen are found in the Jinding PbZn deposit within the Lanping Basin, South China. However, the temporal and genetic associations between hydrocarbons and the deposit are still controversial. To this end, integrating Raman analysis, ReOs geochronology
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Pyrite trace metal and sulfur isotopic compositions track metalliferous fluid circulation within the Ordovician/Silurian organic-rich black shales in the eastern Sichuan Basin, southwestern China Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-14 Shaojie Li, Qilin Xiao, Suyang Cai
Depicting metalliferous fluid flows in sedimentary basins has a remarkable implication for understanding the formation and evolution of organic-rich sediments. The Middle-Upper Yangtze region in South China hosts voluminous gaseous hydrocarbons and MVT-type ZnPb deposits. Natural gases are mainly distributed in the Sichuan Basin, yet ZnPb deposits are found in surrounding regions of the basin. Such
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Experimental investigation on the oil occurrence and mobility of lacustrine shales in offshore area of China using 1D/2D nuclear magnetic resonance and centrifugal techniques Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-13 Sijia Nie, Feng Yang, Long Luo, Kong Deng, Luyu Du
Shale oil occurrence mechanism and mobility have significant influences on hydrocarbons extraction from shale systems. However, the effects of petrophysical and petroleum geochemical properties on oil mobility are not understood. In this study, shales with different lithofacies were investigated using thin sections, scanning electron microscopy, nuclear magnetic resonance (NMR), and organic geochemical
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Occurrences of paleo-wildfires in the early Albian, Erlian Basin, NE China: Evidence from coal petrography and geochemistry Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-10-10 Shuang Gao, Yong Li, Longyi Shao, Cai Tie, Junhui Li, Yuping Zhou
The Albian in the early Cretaceous was a period with extensive and frequent wildfires, yet the wildfire types, intensity, and implications are not well understood due to the lack of continuous wildfire records. In this study, a total of 79 coal samples were collected from a 13 m thick coal seam in the early Cretaceous in the Erlian Basin, Inner Mongolia, China, which were analyzed using Zircon UPb
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Paleoredox and lithofacies assessments in Deepwater intervals of the Monterey Formation, Santa Maria Basin, California: Insights from organic sulfur geochemistry Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-09-06 Ana Vielma, Joseph A. Curiale, Humberto Carvajal-Ortiz, Jagoš R. Radović, Qi Fu, Thomas B. Malloy, K.K. (Adry) Bissada
Although the Monterey Formation has been studied extensively for its petroleum system and Miocene climate insights, debates persist regarding its paleo-redox conditions. Furthermore, its characteristic lithofacies offer a natural laboratory for developing tools to differentiate siliceous and calcareous rocks in deepwater environments. This study evaluated the potential of the Sulfur Index (SI = mg
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Detrital material controlling the enrichment of critical element Li in No. 9 coal seam of the Ningwu Coalfield, northeastern Shanxi Province, China: Heavy mineral and detrital zircon constraints Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-09-06 Chao Liu, Yangmei Chang, Beilei Sun, Xu Wang, Fuhui Qi
As a critical element, Li is currently in high demand due to rapid technological development. Anomalous Li enrichment in Pennsylvanian coals, such as those in Shanxi Province, has been discovered in China. Previous studies have shown that Li enrichment in coal and coal-bearing strata in Shanxi Province is generally evident in clay minerals and is related to mineral matter originating from nearby granite
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The petrology of dispersed organic matter in sedimentary rocks: Review and update Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-09-03 P.A. Gonçalves, J. Kus, P.C. Hackley, A.G. Borrego, M. Hámor-Vidó, W. Kalkreuth, J.G. Mendonça Filho, H.I. Petersen, W. Pickel, M.J. Reinhardt, I. Suárez-Ruiz, ICCP
Organic petrology developed from coal petrology, and, in the 1960s, it began to be applied to the study of dispersed organic matter (DOM) in sedimentary rocks other than coal. Over the last few decades, the petrology of DOM has been used to characterize organic matter in sedimentary basins with an emphasis on fossil fuel resource exploration. Today, due to the global research shift on topics related
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Petrological and geochemical evidences for anaerobic and thermochemical oxidations of methane in petroliferous basins Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-08-30 Wei Ni, Jian Cao, Wenxuan Hu, Ruijie Zhang, Wenjun He, An Xie
Methane oxidation affects hydrocarbon accumulation and carbon cycling with important geological and paleoclimatic responses. However, the petrological and geochemical evidences that can clearly discern anaerobic (AOM) and thermochemical (TOM) oxidations in petroliferous basins are unclear, causing the disputes if these two processes can take place in specific conditions. Here, the Baikouquan Formation
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Assessment of the contamination by carbonaceous anthropogenic particulates and polycyclic aromatic hydrocarbons (PAHs) concentration in recreational areas of an estuary heavily industrialized in Northern Spain Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-08-30 Pelayo Tomillo, Isabel Suárez-Ruiz, María José Iglesias, Mercedes Díaz-Somoano, Dionisio Luis, Efrén García-Ordiales, Joana Ribeiro
The commercial management of coal and its by-products has the potential to negatively impact natural coastal environments. The coal conversion processes and coke production are sources of polycyclic aromatic hydrocarbons (PAHs) emissions that also contribute to the pollution of those aquatic environments. This research assesses the contamination by carbonaceous anthropogenic particles and by polycyclic
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Hydrocarbon potential and depositional environment of the Middle Miocene Balikpapan Formation, lower Kutai Basin, Indonesia: Sedimentology, calcareous nannofossil, organic geochemistry, and organic petrography integrated approach Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-08-29 Jamaluddin, Michael Wagreich, Kateřina Schöpfer, Reinhard F. Sachsenhofer, Maria, Diana Rahmawati
The Middle Miocene Balikpapan Formation is exposed in the Samarinda Anticlinorium, which forms part of the Lower Kutai Basin situated on East Kalimantan, Indonesia. The Balikpapan Formation is considered the main source rock for oil and gas fields in Lower Kutai Basin. This study integrates sedimentology, organic geochemistry, organic petrography and calcareous nannofossil analysis to characterize
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Formation and radiolytic alteration of uraniferous solid bitumen related to hydrothermal base-metal mineralization in the Bytíz deposit, Příbram district, Czech Republic Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-08-23 Tatiana Larikova, Ivana Sýkorová, Martin Racek, Martina Havelcová, Vladimír Machovič, Ladislav Lapčák
The Bytíz deposit is a part of the Příbram uranium and base-metal ore district. It is an example of a vein-type deposit with polyphase hydrothermal mineralization. Samples of uraniferous solid bitumen from Bytíz with U content up to 38 wt% are characterized petrologically, geochemically, and mineralogically using EPMA, Raman and infrared microspectroscopy. The bitumen-bearing samples consist of base-metal
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Paleoenvironmental factors controlling organic-rich formations deposition in the Babouri-Figuil Basin (Northern Cameroon) Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-08-22 William Gaspard Owona Manga, Carolina Fonseca, Moise Bessong, Noelia Franco, Antonio Donizeti de Oliveira, Arsène Meying, Marie Diane Tonye, João Graciano Mendonça Filho
The Babouri-Figuil Basin is an intracratonic basin (half-graben) in northern Cameroon that is genetically connected to the Benue Trough from Nigeria, and is an area of interest in terms of petroleum prospectivity. Recent studies highlighted the presence of organic-rich formations in the basin. However, none of these works have identified factors that governed the accumulation of organic matter (OM)
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The occurrence of coalbed methane in the depocentre of the Upper Silesian Coal Basin in the light of the research from the Orzesze-1 deep exploratory well Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-08-20 Sławomir Kędzior
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Effects of geochemical compositional heterogeneities on hydrocarbon expulsion and thermal maturation: An analog study of Maastrichtian source rocks from Jordan Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-08-09 Muhammad Usman, Sebastian Grohmann, Israa S. Abu-Mahfouz, Volker Vahrenkamp, Ralf Littke
Accurately identifying sweet spots remains a significant challenge for the petroleum industry despite the growing amount of information available for unconventional hydrocarbon resources. These challenges may stem from the inorganic geochemical heterogeneities in source rock composition that can vary within a given basin over time. This study investigates the relationship between source rock composition
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Gas-water flow in fractured coal revealed by multimodal imaging Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-08-06 Wen Xi, Aaron Uthaia Kumaran, Yaser Hadi Gholami, Ryan T. Armstrong, Yu Jing, Joan Esterle, Klaus Regenauer Lieband, Peyman Mostaghimi
This research presents a new method for studying gas-water two-phase flow in fractured coal, integrating cutting-edge imaging techniques. We combine dynamic positron emission tomography (PET), high-resolution X-ray micro-computed tomography (micro-CT), and unsteady-state fluid flow experiments. First, micro-CT under reservoir pressure conditions maps the sample's fracture structure at high-resolution