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Novel insights about petroleum systems from source and reservoir rock characterization, Cretaceous Deposits, Babouri-Figuil Basin, Northern Cameroon Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-03-17 W. Manga Owona Gaspard, J. Hatcherian Javin, C. Hackley Paul, Bessong Moise, L. Bapowa Carole, E. Pougue Henri, Meying Arsène
The Babouri-Figuil Basin (BFB) is a frontier basin for petroleum in Cameroon. It belongs to the series of Cretaceous rift basins of the West and Central Rift System (WCARS), the origin of which is related to the opening of the South Atlantic. Within the same rift system, commercial hydrocarbon accumulations have been discovered in Chad and Sudan and, more recently, in Nigeria (Gongola Basin). The study
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Evaluating the impact of artificial maturation on the petrophysical and geochemical properties of unconventional shale formations by integrating dielectric and NMR measurements Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-03-15 Amjed Hassan, Mahmoud Elsayed, Ali Oshaish, Salah Al-Ofi, Ammar El-Husseiny, Israa S. Abu-Mahfouz, Mohamed Mahmoud, Mohamed Abouelresh, Hussein Attia
This paper addresses challenges in characterizing unconventional shale reservoirs. For the first time, the nuclear magnetic resonance (NMR) and dielectric responses are integrated to characterize intact, saturated, and kerogen-rich subsurface shale samples at various maturation stages. The NMR and dielectric were measured separately using independent pieces of equipment, and all NMR and dielectric
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Depositional conditions, wildfires, maturity, and hydrocarbon potential evaluation of Central Carpathian Paleogene Basin based on integrative approach from Orava Basin Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-03-13 Dorota Staneczek, Dariusz Więcław, Leszek Marynowski
Central Carpathian Paleogene Basin (CCPB, Central Western Carpathians) comprises mainly Oligocene clastic autochthonous age-equivalents of the widely known Menilite shale formation from the Outer Carpathians. However, little is known about the paleoenvironment and its subsequent changes during the basin's evolution. Furthermore, the available hydrocarbon potential data are based on anachronous methods
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Burial and thermal history modeling of basins in convergent oblique-slip mobile zones: A case study of the Ardmore Basin, Southern Oklahoma Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-03-12 Ian A. Cox, Jack C. Pashin
The burial and thermal history of sedimentary basins within oblique-slip mobile zones are unique and multifaceted, with irregular periods of subsidence that are intimately related to compressional and shear stress. Modern basin modeling techniques can constrain the timing of tectonic events and thermal history as well as determine rates and magnitudes of basin subsidence, which in turn, helps guide
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Paleovegetation and environment during deposition of the Late Oligocene sub-bituminous coal in the Bobov Dol Basin (SW Bulgaria) as deduced from petrographic and geochemical characteristics Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-03-11 Alexander Zdravkov, Achim Bechtel, Doris Groβ, Ivan Kojić, Ksenija Stojanović, Dragana Životić
Coal and carbonaceous shale samples were taken from the Late Oligocene Bobov Dol Basin, SW Bulgaria. Seams I, I, II, III, IV and V from the coal-bearing Bobov Dol Fm. were sampled to provide insights into the peat forming vegetation and depositional environment based on detailed organic petrological and geochemical study.
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Depositional environmental controls on mechanical stratigraphy of Barakar Shales in Rajmahal Basin, India Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-03-07 Chinmay Sethi, Bodhisatwa Hazra, Mehdi Ostadhassan, Hem Bahadur Motra, Arpan Dutta, J.K. Pandey, Santosh Kumar
Understanding mechanical behaviour of shale is essential for efficient shale gas extraction, which can vary in different depositional settings. The impact of sedimentary environment on shale characteristics, such as mineralogical composition, total organic carbon content (TOC), and petrophysical properties, has been extensively researched. However, its influence on shale mechanical properties, especially
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Quality and composition of Lower Cretaceous carbonate source rocks and seepage oils in the Belize Basin, southern Belize, Central America Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-03-05 B. Holland, P. Alsen, H.P. Nytoft, A. Rudra, H. Sanei, H.I. Petersen
The Belize Basin in southern Belize, Central America, contains numerous seepage oils derived from marly and carbonate source rocks, but since no definitive source rocks have been identified the source remains uncertain. This study examines by pyrolysis and organic petrography the source rock quality and maturity of 66 samples collected from three newly exposed carbonate sections in the southeastern
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Characteristics of the low-pressure spatial and temporal distributions of oil- and gas-bearing layers in the Ordos Basin, China Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-28 Yang Qin, Chiyang Liu, Lei Huang, Jianqiang Wang, Junfeng Zhao, Deyong Shao, Lihua Yang, Xiaochen Zhao, Ehsan Khalaf, Shaohua Zhang, Nan Du
Abnormal pressure conditions and spatial variations have direct and powerful influences on the aggregation, dissipation, accumulation and development of hydrocarbons under subsurface conditions, and they are extremely important aspects that must be focused on for safe coal mining and oil and natural gas development. The Ordos Basin, located in the western part of the North China Craton (NCC), contains
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Artificial maturation of a Silurian hydrocarbon source rock: Effect of sample grain size and pyrolysis heating rate on oil generation and expulsion efficiency Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-24 Abid Bhullar, Sedat İnan, Salman Qathami, Tülay Y. İnan
Although artificial maturation of hydrocarbon source rocks by laboratory pyrolysis is far from representing natural maturation, it is a useful tool to investigate the process. In this study, we used routine open system pyrolysis for powder samples and Restricted System anhydrous Pyrolysis (RSP) for cm-sized Silurian shale source rock fragments to artificially mature the samples to different end-temperatures
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Quantitative characterization of the evolution of in-situ adsorption/free gas in deep coal seams: Insights from NMR fluid detection and geological time simulations Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-23 Yanbin Yao, Feng Wang, Dameng Liu, Xiaoxiao Sun, Hui Wang
Accurate quantification of the coexistence of adsorbed and free gas content holds the utmost significance for estimating gas-in-place resources and predicting gas production dynamics. In this study, we conducted real-time isothermal adsorption experiments and NMR fluid monitoring on stress-confining core samples, from the Zhengzhuang Block's No.3 coal seam in the southern Qinshui Basin. Our focus was
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Oil migration from internal and external source rocks in an unconventional hybrid petroleum system, Montney Formation, western Canada Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-23 Arka Rudra, James M. Wood, Victoria Biersteker, Hamed Sanei
Unconventional hybrid petroleum systems are partially to entirely self-sourced. Their hydrocarbons are generated within internal (intraformational) organic-rich mudstone source rocks and subsequently migrate into adjacent organic-lean reservoir beds composed of sandstone, siltstone or carbonate. Hybrid systems with volumetrically dominant reservoir-quality rocks can additionally receive hydrocarbon
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Graphitization: Microstructural and microtextural transformations of residual char from international coal combustion ash Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-18 Ana Cláudia Santos, Charlotte Badenhorst, Barbara Białecka, Ignacio Cameán, Alexandra Guedes, Karen Moreira, Georgeta Predeanu, Isabel Suárez-Ruiz, Nicola Wagner, Bruno Valentim
Natural graphite is a critical raw material and its substitution in some applications will contribute to reduce its supply risk. Coal ash, which is still produced in high amounts, contains a carbonaceous solid residue (char) that may be a substitute of natural graphite. For this purpose, char may be graphitized and used in electrocatalysis reactions, however char properties depend on coal rank, composition
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In situ coal permeability and favorable development methods for coalbed methane (CBM) extraction in China: From real data Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-17 Shida Chen, Shu Tao, Dazhen Tang
Permeability plays a significant role in the economic viability of coalbed methane (CBM) development. In China, in situ permeability obtained from injection fall-off tests range from 0.0001 to 41 mD at depths of 130–1728 m, with the majority (78%) falling between 0.01 and 1 mD. Coal reservoirs with high rank, common cleat mineralization, and depth-dependent high stress may result in extremely low permeability
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Advancements in machine learning techniques for coal and gas outburst prediction in underground mines Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-15 Angelina Anani, Sefiu O. Adewuyi, Nathalie Risso, Wedam Nyaaba
Coal and gas outbursts are a major cause of fatalities in underground coal mines and pose a threat to coal power generation worldwide. Among the current mitigation efforts include monitoring methane gas levels using sensors, employing geophysical surveys to identify geological structures and zones prone to outbursts, and using empirical modeling for outburst predictions. However, in the wake of industry
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Geochemistry and petrology of Early Permian lacustrine shales in the Lodève Basin, Southern France: Depositional history, organic matter accumulation and thermal maturity Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-13 Zhongrui Wu, Sebastian Grohmann, Ralf Littke
The lacustrine shales in the Lodève Basin, southern France, serve as excellent archives of paleo-lake development as well as climatic evolution during the Early Permian. In this study, an extensive dataset is presented encompassing organic petrographic data, major and trace element quantification, bulk and molecular organic geochemical proxies, as well as compound-specific stable carbon isotope data
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Impact of goaf gas drainage from surface vertical boreholes on goaf explosive gas zones Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-01 Yuehan Wang, Guangyao Si, Bharath Belle, David Webb, Liang Zhao, Joung Oh
Goaf gas drainage is extensively employed in Australian gassy underground coal mines to manage safety and productivity and to mitigate gas emissions. As mining operations reach greater depths and produce higher levels of gas emissions, narrower spacing between adjacent vertical goaf boreholes and higher suction pressure are increasingly being adopted. While this proactive goaf gas drainage design enhances
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Hyperspectral imaging of coal core: A focus on the visible-near-shortwave infrared (VN-SWIR) region Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-01 W.M. Langa, C. Ndou, L. Zieger, P. Harris, N. Wagner
Analytical technology is constantly being developed, refined, and applied to different materials. A key objective is to develop technologies that are non-destructive, rapid, and improve data accuracy. Hyperspectral imaging (HSI) is a non-destructive analytical technique that measures the spectral response of molecular bonds within mineral crystals or organic matter, caused by their excitation by light
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Fossil cutin of Karinopteris (Middle Pennsylvanian pteridosperm) from the “paper” coal of Indiana, U.S.A. Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-01 José A. D'Angelo, James C. Hower, Gerardo Camí
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Geochemical and petrographic evaluation of hydrous pyrolysis experiments on core plugs of Lower Toarcian Posidonia Shale: Comparison of artificial and natural thermal maturity series Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-02-01 A. Arysanto, L. Burnaz, T. Zheng, R. Littke
Semi-closed hydrous pyrolysis (HP) of whole-rock cuboids is a relatively novel technique aimed at improving the knowledge of the geochemical and petrographic alteration of petroleum source rocks. This study evaluates the comparability of observations on petroleum generation and migration in a natural maturation sequence and after HP in the same source rock. Two artificially matured samples of the Lower
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Origin of organic matter pore heterogeneity in oil mature Triassic Chang-7 mudstones, Ordos Basin, China Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-01-20 Yingzhu Wang, Jijin Yang
Organic matter (OM)-hosted pores play a crucial role in hydrocarbon storage and migration in unconventional shale oil and gas systems. An accurate identification of different OM compositions is critical to understanding the origin of heterogeneity in OM-hosted pore development, which remains challenging due to the lack of apparent intrinsic connection between them. This study correlates light-electron-Raman
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Tracing the geochemical imprints of Maastrichtian black shales in southern Tethys, Egypt: Assessing hydrocarbon source potential and environmental signatures Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-01-20 Douaa Fathy, Alireza Baniasad, Ralf Littke, Mabrouk Sami
This study conducted comprehensive bulk and molecular geochemical analyses, as well as elemental investigations, on seventeen black shale samples collected from the Upper Cretaceous sediments on the western margin of the Red Sea. The primary objective is to assess the hydrocarbon generation potential, maturity, source input, biodegradation levels, and depositional environment characteristics within
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Organic petrology in the service of public awareness: How safe are barbeque briquettes? Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-01-12 Maria Georgaki, Małgorzata Wojtaszek-Kalaitzidi, Kimon Christanis, Stavros Kalaitzidis
Charcoal has been an important source of energy for centuries and remains till today. Currently charcoal is used, mostly for cooking purposes, in the form of lumps, as well as processed in the form of briquettes. Charcoal briquettes are formed by compressing pyrolyzed biomass (charcoal) particles together with a suitable binder, such as starch mixed with water. Based on the European standard EN 1860-2
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Thermodynamic and microstructural properties of the lacustrine Chang-7 shale kerogen: Implications for in-situ conversion of shale Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-01-11 Changrong Li, Zhijun Jin, Liuping Zhang, Xinping Liang
In-situ conversion processes (ICP) represents an effective approach for the commercial exploitation of low- to medium-maturity shale oil. The thermodynamic and microstructural properties of kerogen, as the primary organic matter in shale, have important implications for the design and optimization of ICP. However, the thermodynamic and microstructural properties of the lacustrine Chang-7 shale remain
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Early Cretaceous wildfires and their palaeoenvironmental significance in the Jiuxi Basin, Gansu Province, Northwestern China Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-01-11 Jianguo Hui, Baoxia Du, Mingzhen Zhang, Shaohua Lin, Dunzhu Jiaoba, Jing Zhang, Shuang Dai, Aijing Li, Jing Peng, Guolong Liu
The occurrence of palaeowildfires in terrestrial ecosystems coincides with the colonization of plants, rendering it one of the most significant geological events and holding paramount importance for comprehending paleoclimate and paleoenvironmental changes. This study provides strong evidence of persistent palaeowildfire occurrences in the Jiuxi Basin, Northwestern China, during the Aptian to Albian
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An original set of nanometer-scale mineralogical analyses of cookeite and the implications for Li enrichment: No. 21 coal, Mengjin Mine, western Henan Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-01-09 Duoen Yuan, Xiaomei Wang, Detian Yan, Jing Li, Baoqing Li, Bei Liu, Zixuan Liu, Liwei Zhang
Critical elements in coal deposits, such as lithium (Li), have attracted attention recently due to their economic value. Many studies have suggested that the high enrichment of Li in coals is predominantly associated with cookeite, a Li–bearing chlorite mineral of hydrothermal origin. However, the identification of cookeite in coal has primarily relied on indirect methods, owing to the low atomic number
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Pore systems and their correlation with oil enrichment in various lithofacies of saline lacustrine shale strata Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-01-08 Yan Cao, Zhijun Jin, Rukai Zhu, Kouqi Liu
The potential of China's saline lacustrine shale oil resources is enormous. Currently, the storage space of saline lacustrine shale oil remains unclear, posing significant challenges for commercial development. In this study, we selected the samples from the typical saline lacustrine shale strata of the Lucaogou Formation, Jimusar Sag, Junggar Basin and investigated the pore systems and their relationship
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Recognition and (semi-)quantitative analysis of REE-bearing minerals in coal using automated scanning electron microscopy Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-01-03 Biao Fu, Guorong Xu, James C. Hower, Yijun Cao, Yukun Huang, Liang Si, Li Xian, Guangqian Luo, Guijian Liu, Guangqing Hu, Hong Yao
The recognition and quantification of rare earth and yttrium (REY) minerals in coal is extremely important for understanding their geological origin and developing high-efficiency extraction techniques. This study developed an automated image analysis by scanning electron microscopy (AIA-SEM) method for characterizing REY minerals in coal. Carbon and copper were used as grey-scale calibration standard
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Integrated containment risks assessment for subsurface CO2 storage: Overburden analysis and top seal integrity study, offshore Norway Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-01-03 Md Jamilur Rahman, Manzar Fawad, Nazmul Haque Mondol
This study summarizes the OASIS (Overburden Analysis and Seal Integrity Study for CO2 Sequestration in the North Sea) project that focuses on assessing the containment risks associated with the geological carbon sequestration (CCS) of the Northern Lights project. CCS is viewed as one of the most effective solutions for reducing carbon emissions, as it captures carbon dioxide from point sources and
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Association and textural-compositional evolution of pyrite-organic matter in coals of the Tarakan, Barito, and Pasir Basins, Kalimantan, Indonesia Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-01-02 Aulia Agus Patria, Renaldi Suhendra, Ferian Anggara, Andrea Agangi, Stephen P. Obrochta, Iwan Setiawan
The Barito, Pasir, and Tarakan Basins in Kalimantan Island is the most extensive coal-bearing sedimentary basin in Indonesia, mined since 1989. The coal is notable in having high sulfur coal content, exceeding >10% in some cases, contributed by the presence of pyrite. The latter issue contributed to interest in the coal, forming economic mineral deposits hosted by the sedimentary pyrite and organic
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Geological factors for the enrichment of critical elements within the Lopingian (Late Permian) coal-bearing strata in western Guizhou, Southwestern China: Constrained with whole-rock and zircon geochemistry Int. J. Coal Geol. (IF 5.6) Pub Date : 2024-01-01 Tianyang Yang, Yulin Shen, Lu Lu, Jun Jin, Wen Huang, Fayue Li, Yunfei Zhang, Jiangchen Hu, Lijun Zeng
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Effect of ScCO2-H2O treatment duration on the microscopic structure of coal reservoirs: Implications for CO2 geological sequestration in coal Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-30 Yarui Guan, Zhe Zhou, Zhaolong Ge, Qinglin Deng, Yunzhong Jia, Shan Huang, Changjiang Chen, Shihui Gong
The microstructure of coal reservoirs, especially the pore structure, alters as a result of physicochemical reactions between the CO2 acidic fluid and coals. However, it is still unclear what controls this process and how the pore structure properties of coal alter by the action of CO2 acid fluids change over time. The objective of this study is to identify the underlying mechanism by analyzing the
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Coal structure identification based on geophysical logging data: Insights from Wavelet Transform (WT) and Particle Swarm Optimization Support Vector Machine (PSO-SVM) algorithms Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-25 Zhongzheng Tong, Yanjun Meng, Jinchuan Zhang, Yaning Wu, Zhen Li, Dongsheng Wang, Xingqi Li, Guangxi Ou
Coal structure is closely related to microscopic and macroscopic properties of coal, and its accurate identification is of great significance to coalbed methane (CBM) reservoir evaluation, hydraulic fracturing performance and production efficiency prediction. The identification of coal structure based on geophysical logging data has become a popular topic as well as a challenge. The emerging Machine
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Physicochemical characteristics and oxidative potential of size-segregated respirable coal mine dust: Implications for potentially hazardous agents and health risk assessment Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-24 Yunfei Shangguan, Xinguo Zhuang, Xavier Querol, Baoqing Li, Natalia Moreno, Pedro Trechera, Patricia Córdoba Sola, Gaëlle Uzu, Jing Li
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Modes of occurrence of gallium in Al-Ga-rich coals in the Jungar Coalfield, Ordos Basin, China: Insights from LA-ICP-MS data Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-29 Bo Jiu, Zhijun Jin, Zhaoguo Wang, Runchao Liu, Qitu Hu
Owing to the concern about supply of Ga, it has been attracted much attention for the modes of occurrence of Ga in Al-Ga-rich coal-hosted deposits. However, the modes of occurrence of Ga in coal were mainly investigated using indirect methods, which may cause uncertainties. In this study, laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) spot and mapping analysis were used to
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Multi-tracer approach to constrain groundwater flow and geochemical baseline assessments for CO2 sequestration in deep sedimentary basins Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-28 Harald Hofmann, Julie K. Pearce, Phil Hayes, Sue D. Golding, Nick Hall, Kim A. Baublys, Matthias Raiber, Axel Suckow
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Organic geochemistry and organic petrology of Oligocene and Miocene lignites, subbituminous and high volatile bituminous coals and carbonaceous shales in northern and central Trinidad Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-28 Anastasia A. Baboolal, Ralf Littke, Laura Zieger
The so far unstudied Oligocene and Miocene organic matter–rich deposits of the Cunapo and Nariva Formation of northern and central Trinidad, western tropical Atlantic Ocean have been investigated using organic geochemical and organic petrological techniques to assess the thermal maturity and paleoenvironmental conditions during peat accumulation. Twenty samples were collected along various sections
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Factors controlling the heterogeneity of shale pore structure and shale gas production of the Wufeng–Longmaxi shales in the Dingshan plunging anticline of the Sichuan Basin, China Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-27 Yijun Zheng, Yuhong Liao, Jie Wang, Yongqiang Xiong, Yunpeng Wang, Ping’an Peng
Shale gas exploration in the Dingshan plunging anticline of the Sichuan Basin, China, has uncovered substantial Wufeng–Longmaxi shale reserves. However, substantial variations exist in shale gas content and production among the wells in this region. We investigated the geological factors and mechanisms influencing shale pore structure heterogeneity and shale gas content and production in the area.
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Interactions between surface properties of pristine coals and the intrinsic microbial communities involved in methane formation Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-16 Anna Pytlak, Katarzyna Jaromin-Gleń, Agnieszka Sujak, Anna Szafranek-Nakonieczna
As climate change continues, there is growing interest in the biological, in situ conversion of coal to methane, which is a cleaner and more efficient source of energy. The purpose of this study was to reveal the relationship between the surface properties of coals and the intrinsic microbial communities involved in methane formation. The material examined included nine coals varying in maturity and
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Shale oil potential and mobility in low- to medium-maturity lacustrine shales: A case study of the Yanchang Formation shale in southeast Ordos Basin, China Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-14 Huairen Cao, Jun Shi, Zhao-Wen Zhan, Hao Wu, Xiaoyu Wang, Xin Cheng, Haolin Li, Yan-Rong Zou, Ping'an Peng
Oil mobility is essential for the evaluation of shale oil resources, yet there has been limited research conducted on the oil mobility of low- to medium-maturity lacustrine shale. This study integrates multiple methodologies such as organic geochemistry, mineralogy, oil-kerogen adsorption-swelling experiments, and in-situ conversion process (ICP) models to evaluate the mobility and potential for shale
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Signature characteristics of coal geochemistry from the Eocene Tanjung Formation and the Miocene Warukin Formation, Barito Basin: Insights into geological control on coal deposition and future critical element prospection Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-19 Ferian Anggara, Aulia Agus Patria, Basuki Rahmat, Haryo Wibisono, Muhammad Zulfiqar Jihad Putera, Himawan Tri Bayu Murti Petrus, Feddi Erviana, Esti Handini, Donatus Hendra Amijaya
In conjunction with implementing the Indonesian Act on coal downstream research and development, the geochemical characterization of the Barito Basin coals and an evaluation of the critical elements in coal and coal ashes compared with those found in conventional deposits must be fulfilled. This study documented the signature characteristics of the coal geochemistry in the Barito Basin. Coals from
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Organic petrology and geochemistry of the Devonian-Mississippian bakken formation, Williston Basin, North Dakota Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-13 Zain Abdi, Susan M. Rimmer
The Devonian–Mississippian (D–M) black shales of the Bakken Formation are of interest as a hydrocarbon source due to their high total organic carbon (TOC; 2.2–17.4%) content. The Upper and Lower Members of the Bakken Fm. are shallow marine (100–150 m) sequences. Thirty samples were selected for maceral identification, kerogen typing, and solid bitumen reflectance (SBRo) based on TOC content and down-core
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Exploring the uncertainty of machine learning models and geostatistical mapping of rare earth element potential in Indiana coals, USA Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-10 Snehamoy Chatterjee, C. Özgen Karacan, Maria Mastalerz
Rare earth elements and yttrium (REEs) have a wide range of applications in high- and low-carbon technologies. The strategic significance of REEs has grown due to their expanding applications in manufacturing industries and the constrained availability of these essential resources. This research explores the applicability of machine learning models and their uncertainty for assessing the REE potential
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Assessing biochar's permanence: An inertinite benchmark Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-09 Hamed Sanei, Arka Rudra, Zia Møller Moltesen Przyswitt, Sofie Kousted, Marco Benkhettab Sindlev, Xiaowei Zheng, Søren Bom Nielsen, Henrik Ingermann Petersen
The natural removal of carbon dioxide and its permanent storage by the Earth system occurs through (i) inorganic carbon and (ii) organic carbon pathways. The former involves the “mineralization” of carbon and formation of carbonate minerals, whereas the latter employs the “maceralization” or natural carbonization of biomass into the “inertinite maceral”. The production of biochar is a carbon dioxide
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Mineralogical and elemental composition of the Middle Miocene coal seams from the Alpu coalfield (Eskişehir, Central Türkiye): Insights from syngenetic zeolite formation Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-12-08 Ali İhsan Karayiğit, Rıza Görkem Oskay, Patricia Córdoba Sola, Yılmaz Bulut, Mete Eminağaoğlu
This study focuses on determining mineralogical and elemental compositions of coal seams (to the upwards, D, C, B, A, and S0) within seven coal exploration wells from the Alpu coalfield (Eskişehir, Central Türkiye). Furthermore, the special goal of the study is a comparative analysis of the relations between the elements by using agglomerative hierarchical clustering algorithm with different linkage
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Weathering alterations of coal mining wastes geochemistry, petrography, and mineralogy, a case study from the Janina and Marcel Coal Mines, Upper Silesian Coal Basin (Poland) Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-30 M.J. Fabiańska, J. Ciesielczuk, M. Szczerba, M. Misz-Kennan, D. Więcław, E. Szram, Á. Nádudvari, Z. Ciesielska
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Combining atomic force microscopy and nanoindentation helps characterizing in-situ mechanical properties of organic matter in shale Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-30 Jianfeng Wang, Joanna Dziadkowiec, Yuke Liu, Wenmin Jiang, Yijun Zheng, Yongqiang Xiong, Ping'an Peng, François Renard
The quantification of mechanical properties of organic matter in shale is of significance for the fine prediction and characterization of shale reservoir's mechanical properties. Due to the micron-sized and dispersed distribution of organic matter particles in shale, the accurate evaluation of the actual mechanical response remains challenging. This work focuses on shale from Wufeng-Longmaxi Formation
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Enrichment of rare earth elements in epigenetic dolomite occurring in contact metamorphosed Witbank coals (South Africa) Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-30 Ofentse M. Moroeng, Bridgette Murathi, Nicola J. Wagner
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Formation of boehmite through desilication of volcanic-ash-altered kaolinite and its retention for gallium: Contribution to enrichment of aluminum and gallium in coal Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-28 Shuai Zhang, Tangchen Yuan, Bo Sun, Lei Li, Xiaojun Ma, Songlin Shi, Qinfu Liu
Multiple parting bands within Permo–Carboniferous coal that are generally enriched in critical metals in the northern North China have been confirmed to be altered from volcanic ash (tonsteins). The tonsteins and adjacent coal in some areas contain boehmite with varying contents. Whether or not the boehmite has a relationship with the volcanic-ash-altered kaolinite remains poorly understood. Herein
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Organic minerals in a self-heating coal-waste dump in Upper Silesia, Poland: Structure, formation pathways and environmental issues Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-27 Ádám Nádudvari, Tomasz Krzykawski, Mariola Jabłońska, Monika Fabiańska, Katarzyna Skrzyńska, Anna Abramowicz, Maria Książek, Justyna Ciesielczuk
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The implementation of subterranean barriers with mine pre-drainage to reduce coal mine methane emissions from open-cut and underground metallurgical-coal mines Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-26 Raymond L. Johnson
There is an opportunity to reduce methane emissions from Australian, open pit, metallurgical coal (MC) mines and substantially reduce the carbon intensity of a high-value Australian export industry. MC is critical to the production of steel products and is essential to meet international urbanisation and energy system transformation goals. Initial research on this topic, outlined the application of
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Extractability indices for screening coal combustion byproduct feedstocks for recovery of rare earth elements Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-25 Ward Burgess, Cheuk Fai Chiu, Timothy Cain, Elliot Roth, Murphy Keller, Evan Granite
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CFD modelling of longwall goaf atmosphere under vertical boreholes gas drainage Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-22 Yuehan Wang, Guangyao Si, Joung Oh, Bharath Belle
To effectively control and utilise large amounts of gas emissions from underground coal mining, Australia and many other countries rely heavily on a series of vertical boreholes to capture the gas during mining. This gas capture not only reduces the greenhouse gas impact but also recovers a significant amount of energy. Vacuum pumps are connected to surface boreholes to drive gas flow from the goaf
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Movable and non-movable hydrocarbon fractions in an oil-depleted sandstone reservoir considered for CO2 storage, Nini West Field, Danish North Sea Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-18 H.I. Petersen, W.F. Al-Masri, A. Rudra, S. Mohammadkhani, H. Sanei
The Paleocene–Eocene quartz- and glauconite-rich reservoir sandstones of the depleted Nini West oilfield in the Siri Canyon, Danish North Sea, are considered a CO2 storage site. Mobilization of the remaining oil in the reservoir by the injected supercritical CO2 (scCO2) can cause oil displacement and potentially clogging of pore throats by the non-soluble heavy oil fraction. This study focuses on the
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Geochemistry of the Leatherwood coal in eastern Kentucky with an emphasis on enrichment and modes of occurrence of rare earth elements Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-14 James C. Hower, Cortland F. Eble, Michelle N. Johnston, Leslie F. Ruppert, Shelley D. Hopps, Tonya D. Morgan
The Middle Pennsylvanian (Bolsovian) Leatherwood coal in the central part of eastern Kentucky is a moderately thick, moderate-S seam that has been one of the major energy resources in the region. Much of the seam profile consists of clarain, dull clarain, and durain with some brighter lithologies at the base of the seam and in the upper portion of the coal at one site. A previous study emphasized petrographic
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Assessing the impact of thermal maturation on the evolution of organic chemistry of Bakken Shale: Insights into oil generation Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-09 Chioma Onwumelu, Stephan H. Nordeng
Early development of the Bakken Petroleum System recognized the significance of source rock maturation and the onset of oil generation in determining the geographic limits of production. The process of oil generation kinetics within source rocks involves intricate chemical reactions, where the nature of organic matter and thermal history influence the production of petroleum products. While simple
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Digital rock characterization and CO2 flow simulation of high-volatile bituminous coal: An application to carbon geosequestration Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-11 Weixin Zhang, Sandong Zhou, Shaoqiu Wang, Dameng Liu, Zhejun Pan, Detian Yan
The permeability of CO2 sequestration is influenced by the characteristics of pore–fracture structures in coal, yet the flow simulation via the pore network model (PNM) and the controls of topology and morphology on permeability remain to be understood. First, the pore–fracture structure of high-volatile bituminous coal (HVBC) is characterized using micro-computed tomography, and the flow characteristics
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Data-driven modeling to predict adsorption of hydrogen on shale kerogen: Implication for underground hydrogen storage Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-11-02 Shams Kalam, Muhammad Arif, Arshad Raza, Najeebullah Lashari, Mohamed Mahmoud
The interaction of hydrogen in shale gas formations holds significant interest for long-term subsurface hydrogen storage. Accurately and rapidly predicting hydrogen adsorption in these formations is crucial for assessing underground hydrogen storage potential. Many laboratory experiments and molecular simulations have been conducted to determine hydrogen adsorption. However, laboratory experiments
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Mineralogy and geochemistry of the Middle Jurassic coal from the Hexi Mine, Shenfu Mining Area, Ordos Basin: With an emphasis on genetic indications of siderite Int. J. Coal Geol. (IF 5.6) Pub Date : 2023-10-13 Niande Shang, Jingjing Liu, Qiuchan Han, Rongkun Jia, Shumao Zhao
Siderite is a common carbonate mineral in coal and usually contains geochemical indications (elemental associations and isotopic compositions) for sedimentary environments and regional geological history, but the origin and enrichment mechanism of geochemically-pure siderite in coal is not fully understood. A better understanding of siderite origin in coal can help to decipher the depositional environment