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Advances in Exploration, Development and Utilization of Coal and Coal-Related Resources

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "H: Geo-Energy".

Deadline for manuscript submissions: closed (1 December 2022) | Viewed by 10389

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Special Issue Editors

Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Wuhan 430074, China
Interests: coal geology; critical elements in coal and coal combustion products (CCPs); coal geochemistry; coal mineralogy; environmental geochemistry of CCPs; sustainable and high value added utilization of CCPs
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Guest Editor
1. School of Energy Resources, China University of Geosciences, Beijing 100083, China
2. Coal Reservoir Laboratory of National Engineering Research Center of Coalbed Methane Development & Utilization, Beijing 100083, China
Interests: geological process; energy geoscience; geo-energy resources evaluation; unconventional oil and gas source rock; reservoir fluids performance; micromechanical properties; scale-span structure; oil/gas/water adsorption/desorption
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Guest Editor
School of Earth Sciences and Surveying and Mapping Engineering, China University of Mining and Technology (Beijing), Beijing, China
Interests: mineral matter and trace elements in coal; strategically critical metals in coal-bearing sequences and coal combustion by-products; environmental impact of coal combustion by-products
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleague,

The development of clean and low-carbon energy is undoubtedly imperative in the coming decades worldwide. Coal is definitely an indispensable source of energy necessary for techno-economic progress, currently accounting for 41% of global electricity needs. The combustion of a high volume of coal has led to the release of CO2, NOx, SO2 and toxic elements, as well as to the accumulation of huge amounts of coal combustion products (CCPs), which may pose severe threat to ecosystems. As a consequence, deep exploration and development, as well as the clean and efficient utilization of coal and coal-related resources (e.g., critical metals in coal, coal measure gases, etc.), is of great significance to achieve carbon neutrality. For instance, critical metals in coal and coal-bearing sequences have been a hot topic in the field of coal geology in recent years. The recovery of critical metals from coal and CCPs will contribute not only to the remission of global demand for strategic and critical metal resources but also to the clean and efficient utilization of coal. Meanwhile, research on the characterization and evaluation of coal measure gases, and other coal-related resources, will also greatly promote the development of low-carbon energy.

Thus, this Special Issue aims to discuss the advanced research on geological and geochemical characterization, as well as the exploration, development and utilization of coal and coal-related resources, especially critical metals together with unconventional gases in coal and coal-bearing sequences. We cordially invite authors to contribute either original research articles or review articles dealing with broad range of topics including, but not limited to, the following areas:

  • Critical metals in coal and coal-bearing sequences: geological origin, modes of occurrence, and enrichment mechanisms;
  • Recovery methods of critical metals from coal and CCPs;
  • Characterization of coal measure gases;
  • Novel methods or technologies for exploration and development of coal measure gases;
  • Characterization and novel utilization of CCPs.

Dr. Jing Li
Prof. Dr. Yidong Cai
Prof. Dr. Lei Zhao
Guest Editors

Manuscript Submission Information

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Keywords

  • coal
  • critical metals
  • coal combustion products
  • unconventional resources
  • modes of occurrence
  • recovery methods
  • CCP utilization
  • coal-bearing sequences
  • geological origin

Published Papers (7 papers)

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Editorial

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3 pages, 184 KiB  
Editorial
Advances in Exploration, Development and Utilization of Coal and Coal-Related Resources: An Overview
by Jing Li, Yidong Cai and Lei Zhao
Energies 2022, 15(24), 9304; https://doi.org/10.3390/en15249304 - 8 Dec 2022
Viewed by 1158
Abstract
The worldwide development of clean and low-carbon energy is undoubtedly imperative in the coming decades [...] Full article

Research

Jump to: Editorial

14 pages, 3082 KiB  
Article
The Influence of Fracturing Fluid Volume on the Productivity of Coalbed Methane Wells in the Southern Qinshui Basin
by Wenwen Chen, Xiaoming Wang, Mingkai Tu, Fengjiao Qu, Weiwei Chao, Wei Chen and Shihui Hou
Energies 2022, 15(20), 7673; https://doi.org/10.3390/en15207673 - 18 Oct 2022
Cited by 3 | Viewed by 1108
Abstract
Hydraulic fracturing is the main technical means for the reservoir stimulation of coalbed methane (CBM) vertical wells. The design of fracturing fluid volume (FFV) is mainly through numerical simulation, and the numerical simulation method does not fully consider the water block damage caused [...] Read more.
Hydraulic fracturing is the main technical means for the reservoir stimulation of coalbed methane (CBM) vertical wells. The design of fracturing fluid volume (FFV) is mainly through numerical simulation, and the numerical simulation method does not fully consider the water block damage caused by the leakage of fracturing fluid into the reservoir. In this work, the variance analysis method was used to analyze the production data of 1238 CBM vertical wells in the Fanzhuang block and Zhengzhuang block of the Qinshui Basin, to clarify the relationship between the FFV and the peak gas production (PGP) under the different ratios of critical desorption pressure to reservoir pressure (Rc/r), and to reveal the controlling mechanism of fracturing fluid on CBM migration. The results show that both the FFV and Rc/r have a significant impact on gas production. When Rc/r < 0.5, the PGP decreases with the increase of the FFV, and the FFV that is beneficial to gas production is 200–500 m3. When Rc/r > 0.5, the PGP increases first and then decreases with the increase of FFV. Specifically, the FFV that is favorable for gas production is 500–700 m3. Excessive FFV does not significantly increase the length of fractures due to leaks in the coal reservoir. Instead, it is more likely to invade and stay in smaller pores, causing water block damage and reducing gas production. Reservoirs with high Rc/r have larger displacement pressure, which can effectively overcome the resistance of liquid migration in pores, thereby reducing the damage of the water block. Therefore, different reservoir conditions need to match the appropriate fracturing scale. This study can provide guidance for the optimal design of hydraulic fracturing parameters for CBM wells. Full article
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22 pages, 5077 KiB  
Article
Geological Controls on Geochemical Anomaly of the Carbonaceous Mudstones in Xian’an Coalfield, Guangxi Province, China
by Bo Li, Fuqiang Zhang, Jialong Liao, Baoqing Li, Xinguo Zhuang, Xavier Querol, Natalia Moreno and Yunfei Shangguan
Energies 2022, 15(14), 5196; https://doi.org/10.3390/en15145196 - 18 Jul 2022
Cited by 2 | Viewed by 1159
Abstract
The anomalous enrichment of the rare earth elements and yttrium (REY), U, Mo, As, Se, and V in the coal-bearing intervals intercalated within the carbonate successions in South China has attracted much attention due to the highly promising recovery potential for these elements. [...] Read more.
The anomalous enrichment of the rare earth elements and yttrium (REY), U, Mo, As, Se, and V in the coal-bearing intervals intercalated within the carbonate successions in South China has attracted much attention due to the highly promising recovery potential for these elements. This study investigates the mineralogical and geochemical characteristics of the late Permian coal-bearing intervals (layers A–F) intercalated in marine carbonate strata in the Xian’an Coalfield in Guangxi Province to elucidate the mode of occurrence and enrichment process of highly elevated elements. There are two mineralogical assemblages, including quartz-albite-kaolinite-carbonates assemblage in layers D–F and quartz-illite-kaolinite-carbonates assemblage in layers A–C. Compared to the upper continental crust composition (UCC), the REY, U, Mo, As, Se, and V are predominantly enriched in layers A and B, of which layer A displays the REY–V–Se–As assemblage while layer B shows the Mo–U–V assemblage. The elevated REY contents in layer B are primarily hosted by clay minerals, zircon, and monazite; Mo, U, and V show organic association; and As and Se primarily display Fe-sulfide association. Three geological factors are most likely responsible for geochemical anomaly: (1) the more intensive seawater invasion gives rise to higher sulfur, Co, Ni, As, and Se contents, as well as higher Sr/Ba ratio in layers A–C than in layers D–F; (2) both the input of alkaline pyroclastic materials and the solution/rock interaction jointly govern the anomalous enrichment of REY; and (3) the influx of syngenetic or early diagenetic hydrothermal fluids is the predominant source of U, Mo, V, Se, and As. Full article
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21 pages, 6907 KiB  
Article
Mineralogy and Geochemistry of the Lower Cretaceous Coals in the Junde Mine, Hegang Coalfield, Northeastern China
by Yingchun Wei, Wenbo He, Guohong Qin, Anmin Wang and Daiyong Cao
Energies 2022, 15(14), 5078; https://doi.org/10.3390/en15145078 - 12 Jul 2022
Cited by 7 | Viewed by 1244
Abstract
Hegang coalfield is one of the areas with abundant coal resources in Heilongjiang Province. Characteristics of minerals and geochemistry of No. 26 coal (lower Cretaceous coals) from Junde mine, Hegang coalfield, Heilongjiang province, China, were reported. The results showed that No. 26 coal [...] Read more.
Hegang coalfield is one of the areas with abundant coal resources in Heilongjiang Province. Characteristics of minerals and geochemistry of No. 26 coal (lower Cretaceous coals) from Junde mine, Hegang coalfield, Heilongjiang province, China, were reported. The results showed that No. 26 coal of Junde mine is slightly enriched in Cs, Pb, and Zr compared with world coals. The minerals in No. 26 coal of Junde mine primarily include clay minerals and quartz, followed by calcite, siderite, pyrite, monazite, and zircon. The diagrams of Al2O3–TiO2, Zr/Sc–Th/Sc, Al2O3/TiO2–Sr/Y, and Al2O3/TiO2–La/Yb indicate that the enriched elements in No. 26 coal were mainly sourced from the Late Paleozoic meta-igneous rocks in Jiamusi block. The volcanic ash contribution to No. 26 coal seems very low. Sulfate sulfur indicating oxidation/evaporation gradually decreases during No. 26 coal formation. Full article
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21 pages, 6746 KiB  
Article
Depositional Environment and Organic Matter Enrichment of Early Cambrian Niutitang Black Shales in the Upper Yangtze Region, China
by Peng Xia, Fang Hao, Jinqiang Tian, Wenxi Zhou, Yong Fu, Chuan Guo, Zhen Yang, Kunjie Li and Ke Wang
Energies 2022, 15(13), 4551; https://doi.org/10.3390/en15134551 - 22 Jun 2022
Cited by 6 | Viewed by 1706
Abstract
Natural gas generation is the result of organic matter degradation under the effects of biodegradation and thermal degradation. Early Cambrian black shales in the Upper Yangtze Region are rich in organic matter and have shown great shale gas potentiality in recent years. Nevertheless, [...] Read more.
Natural gas generation is the result of organic matter degradation under the effects of biodegradation and thermal degradation. Early Cambrian black shales in the Upper Yangtze Region are rich in organic matter and have shown great shale gas potentiality in recent years. Nevertheless, the enrichment mechanism and distribution of organic matter in these black shales between different sedimentary settings, such as intra-platform basin, slope, and deep basin, are still poorly understood. In this paper, based mainly on elemental geochemistry, a comprehensive study of the marine redox conditions, primary productivity, sedimentation rate, terrigenous input, hydrothermal activity, and water mass restrictions was conducted on the Early Cambrian Niutitang black shale in the Upper Yangtze Region. Our data showed that an intra-platform basin received a higher terrigenous input and that it deposited under more restricted conditions than the slope and deep basin settings. The primary productivity in the slope and deep basin settings was higher than that in the intra-platform basin setting. In the intra-platform basin, the productivity increased from its inner part to its margin. For the slope and deep basin settings, the high paleoproductivity generated large amounts of organic matter and its preservation was synergistically affected by the redox conditions. In contrast to the slope and deep basin, the preservation of organic matter in the inner part of the intra-platform basin was mainly controlled by redox conditions because the paleoproductivity in it was much lower than in the slope and deep basin settings. The intra-platform basin margin was the most favorable area for accumulating organic matter. Full article
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13 pages, 18114 KiB  
Article
Physical Similarity Simulation of Deformation and Failure Characteristics of Coal-Rock Rise under the Influence of Repeated Mining in Close Distance Coal Seams
by Pengze Liu, Lin Gao, Pandong Zhang, Guiyi Wu, Yongyin Wang, Ping Liu, Xiangtao Kang, Zhenqian Ma, Dezhong Kong and Sen Han
Energies 2022, 15(10), 3503; https://doi.org/10.3390/en15103503 - 11 May 2022
Cited by 10 | Viewed by 1519
Abstract
Aiming at the problem that it is difficult to achieve accurate laying of model and precise excavation of roadways in special surrounding rock structure roadway according to conventional physical similarity simulation, which reduces the reliability of experimental results. An accurate laying of model [...] Read more.
Aiming at the problem that it is difficult to achieve accurate laying of model and precise excavation of roadways in special surrounding rock structure roadway according to conventional physical similarity simulation, which reduces the reliability of experimental results. An accurate laying of model and precise excavation of roadway method, named “labeling positioning and drawing line, presetting roadway model” (LPDLPRM), was proposed. The physical similarity simulation of deformation and failure characteristics of surrounding rock of coal-rock rise, under the influence of repeated mining in close distance coal seams, was carried out based on the method and infrared detection. The results show that the coal-rock rise in close distance coal seams was affected by repeated mining disturbances, and the surrounding rock of coal-rock rise was characterized by obvious asymmetric deformation, specific for the stress and strain near the coal pillar were higher than that of other parts, and cracks near the coal pillar were denser than other parts; when the coal seam is mined in which the coal-rock rise is located, the stress concentration of the surrounding rock near the rise was weakened by mining pressure relief in the upper coal seam; the stress concentration of the surrounding rock near the rise increases when the coal and the lower coal seam are mined, and the stress on the right side (coal pillar side) near the coal-rock rise was the most concentrated. Therefore, it is important to take measures to strengthen support near the coal pillar and to control asymmetric deformation when the coal-rock rise is influenced by repeated mining. Full article
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15 pages, 4281 KiB  
Article
Study on the Mineralogical and Geochemical Characteristics of Arsenic in Permian Coals: Focusing on the Coalfields of Shanxi Formation in Northern China
by Liqun Zhang, Liugen Zheng and Meng Liu
Energies 2022, 15(9), 3185; https://doi.org/10.3390/en15093185 - 27 Apr 2022
Cited by 3 | Viewed by 1335
Abstract
The Huainan Coalfield is a typical multi-coal seam coalfield. In order to systematically investigate the distribution, occurrence, and integration of arsenic (As) in Shanxi coal, 26 coal samples and three rock samples were collected in the No. 1 coal seam of Huainan coalfield. [...] Read more.
The Huainan Coalfield is a typical multi-coal seam coalfield. In order to systematically investigate the distribution, occurrence, and integration of arsenic (As) in Shanxi coal, 26 coal samples and three rock samples were collected in the No. 1 coal seam of Huainan coalfield. The minerals, major element oxides, and As were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), polarized light microscopy, X-ray fluorescence spectroscopy (XRF) and inductively coupled plasma-mass spectrometry (ICP-MS). The results indicated that the coals of Shanxi Formation were characterized by very low ash yields and low total sulfur contents. The identified minerals by XRD in the studied coals are dominated by kaolinite, quartz, calcite, and a lesser amount of pyrite. The As content ranges from 10.33 mg/kg to 95.03 mg/kg, with an average of 44.74 mg/kg. Compared with world coals, the studied coals have higher contents of As, which are characterized by enrichment. Based on statistical analyses, As shows an affinity to ash yield and possible association with silicate minerals. The contents of As in all occurrence fractions were ranked from high to low as follows: residual > Fe-Mn oxides > organic > exchangeable > carbonate. Using B, w(Sr)/w(Ba) and w(B)/w(Ga) geochemical parameter results to invert the depositional environment of the Huainan Shanxi Formation, a suitable coal-forming environment can cause relatively enriched As in coal. Full article
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