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Articles 181 - 210 of 2033

Full-Text Articles in Oil, Gas, and Energy

Intelligent Lithology Identification While Drilling Using Bilstm Integrating Attention Mechanism, Wang Xi, Peng Fengjia, Li Siyang, Guo Xiao, Zhang Feifei, Ran Xiaofeng, Zhang Cong Dec 2025

Intelligent Lithology Identification While Drilling Using Bilstm Integrating Attention Mechanism, Wang Xi, Peng Fengjia, Li Siyang, Guo Xiao, Zhang Feifei, Ran Xiaofeng, Zhang Cong

Coal Geology & Exploration

Objective Vibration signals while drilling reflect the physical properties and microstructural characteristics of rocks, providing a valuable basis for real-time lithology identification. However, existing models suffer from limited accuracy and robustness due to the low dimensionality of signal features and the class imbalance induced by variations in the rock layer thickness. Methods To overcome these limitations, this study proposed a novel lithology identification method based on a bidirectional long short-term memory (BiLSTM) network that integrates attention mechanism (also referred to as the BiLSTM-Attention). This approach incorporates automated feature extraction and class weight adjustment strategies to enhance both the classification performance …

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Uniqueness And Prospects Of Co2 Sequestration In Basalts, Hu Chenlin, Sang Shuxun, Li Xin, Rui Zhenhua, Liu Shiqi, Wang Ziqiang, Xie An, Yu Huan Dec 2025

Uniqueness And Prospects Of Co2 Sequestration In Basalts, Hu Chenlin, Sang Shuxun, Li Xin, Rui Zhenhua, Liu Shiqi, Wang Ziqiang, Xie An, Yu Huan

Coal Geology & Exploration

Objective and Method CO2 sequestration in basalts offers advantages such as permanent carbonation and elevated safety. Based on literature review and case studies, this study compared the CO2 sequestration performance of basalts, clastic rocks, and carbonate rocks. Accordingly, the pros and cons of technologies for CO2 sequestration in these rocks were determined, and the dominant mechanisms underlying the CO2 sequestration were identified. By revealing the characteristics of CO2 sequestration in the three rock types based on representative projects and tests, this study conducted a comparative analysis of the mechanisms, conditions, technologies, potential, and siting for …

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Application Of Seismic-While-Tunnelling Detection In The Identification Of Densely Distributed Sub-Seismic Faults, Li Haodang, Li Kang, Chen Jian, Song Xiaozhong, Jin Dan, Wang Baoli Dec 2025

Application Of Seismic-While-Tunnelling Detection In The Identification Of Densely Distributed Sub-Seismic Faults, Li Haodang, Li Kang, Chen Jian, Song Xiaozhong, Jin Dan, Wang Baoli

Coal Geology & Exploration

Objective and Method Densely distributed sub-seismic faults have emerged as a major hidden disaster-causing geological factor, heavily influencing both the production efficiency and operational safety of coal mines. To achieve precise advance detection of underground sub-seismic faults in coal mines, this study designed a geological model. Using seismic-while-tunneling (SWT) advance detection technology for roadways of coal mines, this study investigated the geological situation of sub-seismic faults through forward modeling. Furthermore, it explored the seismic image characteristics of these faults obtained using the SWT observation system under varying survey line lengths and geophone spacing values. Results and Conclusions The forward modeling …

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Table Of Contents, The Editors Dec 2025

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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A Method For Advance Detection Of Underground Concealed Water Hazards In Coal Mines Based On Borehole Transient Electromagnetic Method And Vector Synthesis, Fan Tao, Hao Yue, Li Ping, Zhao Rui, Liu Zaibin, Ma Liang, Li Peng, Yan Junsheng Dec 2025

A Method For Advance Detection Of Underground Concealed Water Hazards In Coal Mines Based On Borehole Transient Electromagnetic Method And Vector Synthesis, Fan Tao, Hao Yue, Li Ping, Zhao Rui, Liu Zaibin, Ma Liang, Li Peng, Yan Junsheng

Coal Geology & Exploration

Background The advance detection of underground concealed water hazards in coal mines is crucial to ensuring the safe and efficient roadway tunneling. The borehole transient electromagnetic (TEM) method allows for long-distance advance detection. However, due to the limitation of the spatial structure of boreholes, currently available techniques can only effectively identify low-resistivity anomalies (e.g., water-bearing structures) in the radial direction, leaving blind areas in the primary tunneling direction (i.e., the axial direction of boreholes). Objective and Method To address this challenge, this study proposed a method for the advance detection of concealed water hazards in the axial direction of boreholes …

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A Simulation Study On A Dual-Borehole Dc Resistivity System For Advance Detection Under Varying Angles, Zhou Guanqun, Xu Shaotian, Zhang Weixin, Wang Yafei, Wu Xiaoping, Hu Xiongwu, Chen Xinghai, Cao Yu Dec 2025

A Simulation Study On A Dual-Borehole Dc Resistivity System For Advance Detection Under Varying Angles, Zhou Guanqun, Xu Shaotian, Zhang Weixin, Wang Yafei, Wu Xiaoping, Hu Xiongwu, Chen Xinghai, Cao Yu

Coal Geology & Exploration

Significance Mine direct current (DC) methods, an efficient geophysical exploration technique, can be used to identify and delineate underground electrical resistivity anomalies, serving as a critical means for the advance detection of water-bearing or hydraulically conductive structures ahead of the mining face. Methods By combining the water exploration and discharge boreholes commonly used in coal mining and making reference to the observation system of the ground-based cross-borehole DC resistivity CT method, this study devised a dual-borehole DC resistivity observation system for advance detection. Through numerical simulation using the COMSOL software, this study constructed a homogeneous full-space model, in which a …

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Logging-While-Drilling Azimuthal Electromagnetic Measurements For High-Resistivity Coal Seams, Zhao Weina, Zheng Dongfang, Ai Weiping, Xie Xia Dec 2025

Logging-While-Drilling Azimuthal Electromagnetic Measurements For High-Resistivity Coal Seams, Zhao Weina, Zheng Dongfang, Ai Weiping, Xie Xia

Coal Geology & Exploration

Objective and Method To determine the boundary detection capability of logging-while-drilling (LWD) electromagnetic azimuthal measurements for high-resistivity coal mines, this study simulated geosignal responses under varying operating frequencies, transmitter-receiver coil spacing conditions, and formation resistivity values. Then, key parameters for boundary detection for high-resistivity coal seams were optimized. Accordingly, this study proposed design schemes for LWD instruments with short (< 80 inches) and long (approximately 240 inches) transmitter-receiver coil spacing for short-distance (2.032 m) and long-distance (6.096 m) detection, respectively. Results and Conclusions LWD electromagnetic azimuthal measurements exhibit a significantly decreased depth of detection (DOD) in high-resistivity coal seams compared to that in low-resistivity hydrocarbon reservoirs. Consequently, the existing methods for selecting the operating frequency and transmitter-receiver coil spacing are …

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Application Of Long-Distance Tunneling And Detection For Advance Detection In Excavation Using Shield Tunneling Machines, Chen Chao, Li Ping, Li Wei, Wei Rong Dec 2025

Application Of Long-Distance Tunneling And Detection For Advance Detection In Excavation Using Shield Tunneling Machines, Chen Chao, Li Ping, Li Wei, Wei Rong

Coal Geology & Exploration

Objective and Method During the rapid excavation process using shield tunneling machines in coal mines, the advance detection of concealed geological anomalies encounters challenges of limited space and insufficient accuracy. To overcome these issues, this study investigated highly-located drainage roadway 3211 in the Tiandi Wangpo Coal Mine in Jincheng City, Shanxi Province using the long-distance tunneling and detection technology, the core of which is long directional boreholes combined with comprehensive borehole geophysical prospecting. This roadway is located in the roof of the No.3 coal seam, and it is necessary to conduct shield construction in the stable sandstone layer located from …

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Structural Evolution And Spontaneous Combustion And Activation Mechanisms Of Coals Treated Under Inert Atmospheres In A Coal Mine Goaf, Zhang Leilin, Li Wanting, Wen Chenchen Dec 2025

Structural Evolution And Spontaneous Combustion And Activation Mechanisms Of Coals Treated Under Inert Atmospheres In A Coal Mine Goaf, Zhang Leilin, Li Wanting, Wen Chenchen

Coal Geology & Exploration

Objective When used for the treatment of fire zones in deep coal mine goafs, low-oxygen and inertization techniques suffer from a scientifically blind spot, i.e., the fire prevention and control bottleneck caused by a high susceptibility to re-ignition of coals after being treated with high-temperature, low-oxygen (or inert) gas. To overcome this limitation, this study aims to systematically determine the mechanisms by which the evolution of the physical and chemical structures of coals after heat treatment under different atmospheres influences their spontaneous combustion and activation behavior. The purpose is to provide theoretical support for the treatment and safe opening of …

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A Method For Interpretating Acoustic Reflection Imaging Logging Data Of Fractured-Vuggy Reservoirs Based On Their Theoretical Response Characteristics, Huang Ruokun, Jiang Kai, Wu Xingneng, Ma Kunyu, Su Yuanda, Wang Bing, Chen Xu Dec 2025

A Method For Interpretating Acoustic Reflection Imaging Logging Data Of Fractured-Vuggy Reservoirs Based On Their Theoretical Response Characteristics, Huang Ruokun, Jiang Kai, Wu Xingneng, Ma Kunyu, Su Yuanda, Wang Bing, Chen Xu

Coal Geology & Exploration

Objective During the exploration and development of fractured-vuggy carbonate reservoirs, acoustic reflection imaging logging technology enables the detection of fractured-vuggy bodies around wells. However, this technology suffers from unclear response characteristics and a strong multiplicity of solutions. Focusing on the Tarim Oilfield, this study aims to establish a tailored interpretation method by integrating geological and geophysical characteristics. The purpose is to enhance the identification accuracy and reliability of fractured-vuggy bodies in these reservoirs. Methods Based on the distribution characteristics of fractured-vuggy carbonate reservoirs in the Tarim Oilfield, this study established the numerical simulation models of three typical fractured-vuggy bodies: inter-breccia …

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Fructure Mechanisms And Fracture Distribution Patterns Of Main Roofs In Goaves Within Abandoned Mines, Tao Xuefeng, Shi Biming, Hua Xinzhu, Lin Baiquan, Yue Jiwei, Liang Yuehui, Zhang Chengcheng, Qin Hao, Yang Yong, Xue Yonglin Dec 2025

Fructure Mechanisms And Fracture Distribution Patterns Of Main Roofs In Goaves Within Abandoned Mines, Tao Xuefeng, Shi Biming, Hua Xinzhu, Lin Baiquan, Yue Jiwei, Liang Yuehui, Zhang Chengcheng, Qin Hao, Yang Yong, Xue Yonglin

Coal Geology & Exploration

Objective In abandoned mines, the storage zones of free gas are closely associated with overburden fractures in goaves. To accurately estimate free gas resources in abandoned mines, it is necessary to thoroughly investigate the rupture mechanisms of blocks in main roofs in goaves, as well as the overburden fractures and rupture trace morphologies in goaves. Methods Based on the masonry beam theory, this study established a mechanical model for the primary cantilever beam of a main roof. The analytical solutions of the stress components in the primary cantilever beam were analyzed using the stress inverse method, and the mathematical expression …

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Numerical Simulations Of Dynamic Rock Damage Under Laser-Induced Shock Waves, Xu Yuelin, Qin Enwei, Li Wei, Wang Ying Dec 2025

Numerical Simulations Of Dynamic Rock Damage Under Laser-Induced Shock Waves, Xu Yuelin, Qin Enwei, Li Wei, Wang Ying

Coal Geology & Exploration

Objective Traditional laser thermal rock breaking technologies suffer from high energy consumption and a limited damage depth. To overcome these challenges, this study proposed a novel mechanical rock breaking method based on high-pressure plasma shock waves induced by short pulsed lasers, aiming to transform a thermodynamics-dominated rock breaking mechanism into a dynamics-dominated mechanism. Methods and Results Under the Abaqus/Explicit explicit dynamics framework, this study constructed a finite element model to simulate the interactions between nanosecond laser-induced shock waves and rocks. The accurate loading of shock wave pressure in the spatial and temporal domains was achieved using the VDLOAD user subroutine. …

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A Novel Model For Calculating In Situ Stress Within Deep Coal Seams Considering Microstructural Characteristics And Its Application, Zhao Haifeng, Shi Hongwei, Xie Fei, Wang Chengwang, Wang Zongfei, Chen Gaojie Dec 2025

A Novel Model For Calculating In Situ Stress Within Deep Coal Seams Considering Microstructural Characteristics And Its Application, Zhao Haifeng, Shi Hongwei, Xie Fei, Wang Chengwang, Wang Zongfei, Chen Gaojie

Coal Geology & Exploration

Objective Research on in situ stress serves as a bridge between geological and engineering analyses. Accurate insights into in situ stress regimes are crucial for ensuring engineering efficiency and development benefits. However, microstructures are well developed in deep coal seams, for which no effective model is currently available for calculating in situ stress. Methods and Results By classifying structures into macrostructures and microstructures, this study established a novel model for calculating in situ stress in deep coal seams while considering microstructural characteristics. In the novel model, the horizontal in situ stress was decomposed into three components: the horizontal components induced …

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Technique For Water-Preserved Coal Mining Based On Zonal Height Limits Along Mining Face And Mechanisms Behind Overburden Failure, Sun Xueyang, Cao Hongyi, Li Peng, Han Dehao, Luo Qiyao, Liu Kuan, Li Jihong, Yin Xu Dec 2025

Technique For Water-Preserved Coal Mining Based On Zonal Height Limits Along Mining Face And Mechanisms Behind Overburden Failure, Sun Xueyang, Cao Hongyi, Li Peng, Han Dehao, Luo Qiyao, Liu Kuan, Li Jihong, Yin Xu

Coal Geology & Exploration

Objective The exploitation of shallow coal seams under water bodies faces a contradiction between water resource preservation and overburden disturbance. In this case, achieving safe mining while preventing water-conducting fracture zones from affecting key aquifers and exploring techniques that place equal emphasis on water preservation and efficient resource recovery have emerged as popular research topics. Methods An integrated aquifer-overburden-coal seam model was constructed using 3D geological visualization technology. This model, combined with the principles for the setting up of waterproof coal pillars, enabled accurate delineation of zones with water inrush risks. Accordingly, a technical scheme for mining based on zonal …

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Sensitivity Analysis Of Factors Influencing Water Redistribution In Vadose Zones Under Coal Mining Disturbance In Ecologically Vulnerable Areas, Wang Ao, Liu Shiliang, Wang Shanlin, Zheng Yusheng, Wang Tengye, Wang Zuzhen, Mao Deqiang Dec 2025

Sensitivity Analysis Of Factors Influencing Water Redistribution In Vadose Zones Under Coal Mining Disturbance In Ecologically Vulnerable Areas, Wang Ao, Liu Shiliang, Wang Shanlin, Zheng Yusheng, Wang Tengye, Wang Zuzhen, Mao Deqiang

Coal Geology & Exploration

Objective Coal mining-induced disturbance leads to water redistribution in the vadose zones of mining areas. The sensitivity analysis of the factors influencing this redistribution holds critical significance for the reconstruction of eco-geological environments and the sustainable economic development in mining areas. Methods Against the engineering background of the Yushen mining area characterized by wind-blown sandy terrain in northern Shaanxi Province, this study analyzed the primary factors influencing water redistribution in the vadose zone under coal mining disturbance. Accordingly, 18 COMSOL Multiphysics numerical models for water redistribution in the vadose zone under coal mining disturbance were constructed through orthogonal experiments. Using …

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Macro-Mesoscopic Developmental Patterns Of Cracks In Surrounding Rocks Of Rectangular Roadways Under True Triaxial Stresses, Shi Wenbao, Xu Qingzhao, Chang Jucai, Li Chuanming, Qiao Longquan, Miao Zhuang, Yan Aoyun Dec 2025

Macro-Mesoscopic Developmental Patterns Of Cracks In Surrounding Rocks Of Rectangular Roadways Under True Triaxial Stresses, Shi Wenbao, Xu Qingzhao, Chang Jucai, Li Chuanming, Qiao Longquan, Miao Zhuang, Yan Aoyun

Coal Geology & Exploration

Objective and Method This study aims to investigate the relationship between the stress environment and the deformation and failure responses of surrounding rocks, thereby unraveling the inherent mechanisms underlying the deformation and failure. With cement, river sands, and gypsum as raw materials, rectangular roadway model specimens measuring 200 mm × 200 mm × 200 mm were prepared. Using a large-scale true triaxial seepage coupling testing machine, this study conducted triaxial loading tests on the rectangular roadway specimens under different lateral pressure coefficients. Using microcameras and an acoustic emission system, it monitored the whole process of the macroscopic deformation and failure, …

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Simulation Of Groundwater Flow Field Evolution And Water Inrush Risks Under The Deep-Well Reinjection Of High-Tds Mine Water, Liu Qi, Sun Yajun, Fan Jianguo, Tan Xianfeng, Xiao Shengxin, Yang Chuanwei, Chen Weiyang, Chen Ge Dec 2025

Simulation Of Groundwater Flow Field Evolution And Water Inrush Risks Under The Deep-Well Reinjection Of High-Tds Mine Water, Liu Qi, Sun Yajun, Fan Jianguo, Tan Xianfeng, Xiao Shengxin, Yang Chuanwei, Chen Weiyang, Chen Ge

Coal Geology & Exploration

Objective The deep-well reinjection of mine water results in a regional groundwater level rise to varying degrees, possibly inducing hydrogeological hazards such as floor water inrushes or water inrushes along faults. In this context, determining the evolutionary pattern of the groundwater flow field under long-term mine water reinjection and conducting reinjection safety assessments play a critical role in ensuring both the safety of mine water reinjection and water conservation-based coal mining.Methods This study examined the reinjection of mine water in a coal mine within the Juye coalfield, North China. Based on the geological conditions for mine water reinjection in …

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An Experimental Study On The Deterioration Characteristics Of Sandstone Masses With Rock Bridges Under Cyclic Freezing And Thawing, Zhang Huimei, Li Zengle, Chen Shiguan, Yuan Chao, Zheng Shihang Dec 2025

An Experimental Study On The Deterioration Characteristics Of Sandstone Masses With Rock Bridges Under Cyclic Freezing And Thawing, Zhang Huimei, Li Zengle, Chen Shiguan, Yuan Chao, Zheng Shihang

Coal Geology & Exploration

Objective To determine the deformation and failure mechanisms of fractured rock masses with rock bridges in alpine regions, this study conducted mechanical property tests on rock samples with varying lengths of rock bridges subjected to cyclic freezing and thawing. Methods Through experiments, this study summarized the characteristics of the static strength deterioration of rock masses under the combined effects of different numbers of freezing and thawing cycles and varying rock bridge lengths. By combining acoustic emission signal monitoring and scanning electron microscopy, this study thoroughly explored both the evolutionary characteristics of fractures and rock rupture modes. Accordingly, it revealed the …

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Current Status And Future Trend Of Research On Underground Borehole Measurement Technology For Coal Mines, Chen Long, Yang Dongdong, Li Quanxin, Chu Zhiwei, Zhang Jiguan, Chen Xiang Dec 2025

Current Status And Future Trend Of Research On Underground Borehole Measurement Technology For Coal Mines, Chen Long, Yang Dongdong, Li Quanxin, Chu Zhiwei, Zhang Jiguan, Chen Xiang

Coal Geology & Exploration

Background Underground borehole measurement emerges as a core technology for the safe production of coal mines. Its multi-parameter measurements, data accuracy, data transmission rate, and reliability directly influence the timeliness of early warning for disasters, the operating stability of instruments, the accuracy of borehole assessment, and the scientific rigor of intelligent decision-making under complex deep geological conditions. Advances So far, the measurement while drilling (MWD) and post-drilling borehole visualization techniques have developed into a diversified technological system. Specifically, the MWD technique has achieved a leap from wireline to wireless transmission, obviating the reliance on wireline drill rods in traditional measurement …

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Table Of Contents, The Editors Dec 2025

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Environmental Risk Assessment Of Co2 Storage Combined With The Overlying Coal Mining, Gu Leiyu, Li Wenhui, Huang Wei, Zhou Quanchao, Zhu Yalong, Li Xiaying, Liu Guizhen, Li Qi Dec 2025

Environmental Risk Assessment Of Co2 Storage Combined With The Overlying Coal Mining, Gu Leiyu, Li Wenhui, Huang Wei, Zhou Quanchao, Zhu Yalong, Li Xiaying, Liu Guizhen, Li Qi

Coal Geology & Exploration

Objective Carbon capture, utilization, and storage (CCUS) technology serves as a key method for carbon neutrality. However, large-scale engineering applications of CCUS are still confronted with serious challenges of environmental risks. Therefore, systematic environmental risk assessment plays an essential role in ensuring the environmental safety and social acceptability of CO2 geological storage projects. Methods Targeting the CO2 geological storage project combined with overlying coal mining in Zhengning County, Gansu Province, this study performed the environmental risk assessment of CO2 leakage based on the requirements of the Technical Guideline on Environmental Risk Assessment for Carbon Dioxide Capture, Utilization, …

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Variation Characteristics Of Co2 Adsorption Phase Density In Coal Seam And Its Controlling Mechanism: A Case Study Of Huainan-Huaibei Coalfield, Liu Huihu, Fan Zhengpu, Yang Jinghao, Liu Junlin, Ding Hai, Xu Hongjie, Gao Deyi, Fang Huihuang, Zhao Yuqing Dec 2025

Variation Characteristics Of Co2 Adsorption Phase Density In Coal Seam And Its Controlling Mechanism: A Case Study Of Huainan-Huaibei Coalfield, Liu Huihu, Fan Zhengpu, Yang Jinghao, Liu Junlin, Ding Hai, Xu Hongjie, Gao Deyi, Fang Huihuang, Zhao Yuqing

Coal Geology & Exploration

Objectives and Methods The CO2 adsorption phase density is a key factor determining the CO2 adsorption sequestration capacity in coal seams. To deeply understand the characteristics of CO2 density distribution in pores of the coal seam, taking the No.13 coal from Liuzhuang Mine of Huainan mining area and the No.7 coal in Huaibei mining area as the research objects, the CO2 adsorption phase density of at different pressures and temperatures with different dominant pore diameters was simulated through the simplified local density theory (SLD). The CO2 adsorption phase densities were obtained by different methods, the …

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Reservoir Responses To Reactions In Co2 Mineral Trapping And Geologic Carbon Sequestration Prospects For Basalts In Western Guizhou Province, China, Han Sijie, Ai Zhixi, Liu Jijie, Zhou Xiaozhi, Gao Wei, Liu Zhu Dec 2025

Reservoir Responses To Reactions In Co2 Mineral Trapping And Geologic Carbon Sequestration Prospects For Basalts In Western Guizhou Province, China, Han Sijie, Ai Zhixi, Liu Jijie, Zhou Xiaozhi, Gao Wei, Liu Zhu

Coal Geology & Exploration

Background Geologic CO2 sequestration in basalts has attracted wide attention in recent years owing to its safe, stable, and efficient CO2 trapping mechanisms.Methods Focusing on basalts in the Longtan Formation within western Guizhou Province, China, this study simulated the CO2-water-basalt geochemical reactions under varying temperatures, pressures, and times. Through tests and comparison of mineralogy, geochemistry, and reservoir physical properties before and after the reactions, this study investigated the factors influencing the reactions and elucidated the post-reaction co-evolution mechanism between minerals and pores. Furthermore, the mechanisms behind CO2 trapping in basalts were summarized, and the …

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Spatial Distribution And Source-Sink Matching Of Stationary Co2 Emissions In Zhejiang Province, Zhu Qianlin, Chen Dongbao, Liu Hanxiao, Lu Shijian, Chen Fu Dec 2025

Spatial Distribution And Source-Sink Matching Of Stationary Co2 Emissions In Zhejiang Province, Zhu Qianlin, Chen Dongbao, Liu Hanxiao, Lu Shijian, Chen Fu

Coal Geology & Exploration

Objective Carbon capture, utilization, and storage (CCUS) is supposed to become an essential technology for the consumption of fossil fuels under the background of achieving carbon neutrality. Delving into the spatial distribution of regional CO2 stationary sources and the source-sink matching characteristics will contribute to more rational decision-making in CCUS deployment and promote the development of carbon sequestration technology. Methods This study investigated the spatial distribution of CO2 stationary sources in Zhejiang Province and, using the carbon emission factor method, assessed their CO2 emissions based on their scales. Furthermore, it analyzed the geological features of both onshore …

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Supersaturation Effect And Its Characterization In Gas-Rich Intervals Of Deep Coal Seams, Zhou Lihong, Li Yong, Ding Rong, Li Yun, Li Yongzhou, Kong Jintao Dec 2025

Supersaturation Effect And Its Characterization In Gas-Rich Intervals Of Deep Coal Seams, Zhou Lihong, Li Yong, Ding Rong, Li Yun, Li Yongzhou, Kong Jintao

Coal Geology & Exploration

Objective and Method High free gas content serves as a key factor controlling the enrichment and high productivity of deep coalbed methane (CBM). However, its direct determination is challenging, making the accurate identification of free gas-rich coal seam intervals a core scientific issue for efficient exploration and recovery of CBM. This study investigated the Daning-Jixian block (also referred to as the Daji Block) within the Ordos Basin. Based on analyses and tests of the gas content, coal macrolithotype, physical properties, and log responses of cores collected from representative wells through pressure-retained coring, this study systematically assessed the vertical heterogeneity of …

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Physical Simulation Experiments On 4d Visualization Of Dynamic Methane Diffusion And Adsorption In Low-Porosity And Low-Permeability Coals, Liu Tong, Jiao Baizhuo, Lin Baiquan, Sang Shuxun, Yang Wei, Liu Shiqi, Liu Ting, Li He, Yang Mingxing Dec 2025

Physical Simulation Experiments On 4d Visualization Of Dynamic Methane Diffusion And Adsorption In Low-Porosity And Low-Permeability Coals, Liu Tong, Jiao Baizhuo, Lin Baiquan, Sang Shuxun, Yang Wei, Liu Shiqi, Liu Ting, Li He, Yang Mingxing

Coal Geology & Exploration

Objective and Method The diffusivity of methane (CH4) in coal seams significantly influences the surface extraction of coalbed methane (CBM) and underground gas drainage. However, the visualized characterization of the diffusion and migration processes of CH4 in coals remains challenging. To address this issue, this study systematically demonstrated the similarity between krypton (Kr) and CH4 in their adsorption and diffusion behavior in coals. Utilizing Kr—a gas with high X-ray attenuation—as a tracer substitute for CH4, this study achieved the transparent observation of the dynamic gas migration process in low-porosity, low-permeability, and heterogeneous coals using …

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Organically-Bound Forms Of Alkali And Alkaline Earth Metals In High-Alkali Coals And Their Geological Indications, Wang Xiaoling, Wang Shaoqing, Zhao Yungang, Mu Ruifeng, Shao Yan Dec 2025

Organically-Bound Forms Of Alkali And Alkaline Earth Metals In High-Alkali Coals And Their Geological Indications, Wang Xiaoling, Wang Shaoqing, Zhao Yungang, Mu Ruifeng, Shao Yan

Coal Geology & Exploration

Objective and Method Alkali and alkaline earth metals (AAEMs) in coals adversely affect coal processing and utilization. Among the AAEMs, water-soluble and mineral-hosted metals can be largely removed through water washing, flotation, and heavy liquid separation, while organically-bound AAEMs are difficult to eliminate. In this study, high-alkali coal samples with varying vitrinite/inertinite ratios (V/Is) collected from the Zhundong coalfield in Xinjiang were selected to investigate the organically-bound forms of AAEMs. Through sequential chemical extraction, combined with experimental techniques such as 23Na cross-polarization magic-angle spinning nuclear magnetic resonance (23Na CP/MAS NMR) and transmission electron microscopy-energy dispersive …

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Mechanisms Underlying Sodium Enrichment In Coals In The Dananhu Mining Area, Turpan-Hami Basin, Qi Zhenghui, Sun Fanxing, Wang Wenlong, Huang Chunhui, Liang Kaihua, Huang Yangyang, Shao Longyi Dec 2025

Mechanisms Underlying Sodium Enrichment In Coals In The Dananhu Mining Area, Turpan-Hami Basin, Qi Zhenghui, Sun Fanxing, Wang Wenlong, Huang Chunhui, Liang Kaihua, Huang Yangyang, Shao Longyi

Coal Geology & Exploration

Background The Dananhu mining area boasts abundant coal resources, serving as a significant coal-fired power generation base in Xinjiang, China. However, the high sodium (Na) content in coals within the mining area tends to cause fouling and slagging during coal combustion, severely affecting the clean and efficient utilization of coal resources in the area. Methods and Results epresentative samples collected from the major mineable coal seams were subjected to proximate and ash-composition analyses. The analytical results show that the coal samples had low ash and sulfur contents and high volatile content. SiO2 predominated in the ash components, followed by …

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Mechanisms Behind Soil Water Evaporation And Infiltration During Long-Term Microbial Reclamation In Coal Mining-Induced Subsidence Areas In Northern Shaanxi Province, China, Ke Zengming, Bi Yinli, Yang Wei Dec 2025

Mechanisms Behind Soil Water Evaporation And Infiltration During Long-Term Microbial Reclamation In Coal Mining-Induced Subsidence Areas In Northern Shaanxi Province, China, Ke Zengming, Bi Yinli, Yang Wei

Coal Geology & Exploration

Background Water scarcity is identified as an important factor restricting ecological restoration in arid and semi-arid mining areas. The application of microbial reclamation technologies, especially inoculation with Arbuscular mycorrhizal fungi (AMF), has achieved encouraging ecological effects in mining areas. In this case, investigating soil water movement and its controlling factors in mining areas undergoing long-term microbial reclamation is a key scientific issue for understanding the long-term ecological restoration mechanisms of AMF. Methods This study investigated the microbial reclamation base in the coal mining-induced subsidence area of the Daliuta coal mine of northern Shaanxi Province, located in the middle reaches of …

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Water Quality Characteristics And Reutilization Of Goaf Water From Shallow Coal Seams Within The Datong Mining Area, Shanxi Province, China, Li Jun, Gui Herong, Ding Pengfei, Chen Yongqing, Wan Heyong, Li Weiqi, Huang Dawei, Peng Weihua, Hu Yang, Guo Yan Dec 2025

Water Quality Characteristics And Reutilization Of Goaf Water From Shallow Coal Seams Within The Datong Mining Area, Shanxi Province, China, Li Jun, Gui Herong, Ding Pengfei, Chen Yongqing, Wan Heyong, Li Weiqi, Huang Dawei, Peng Weihua, Hu Yang, Guo Yan

Coal Geology & Exploration

Objective The Datong mining area in Shanxi Province of China faces serious threats from goaf water hazards, while the goaf water drainage is constrained by environmental protection policies. Therefore, the reutilization of goaf water serves as an effective approach to eliminating mine water hazards, protecting water environments, and mitigating water scarcity in the mining area. Methods This study investigated goaf water from shallow coal seams in the Datong mining area. Based on water quality assessment theories and a range of hydrogeochemical indices, including saturation index (SI), chloro-alkaline index (CAI), and sodium adsorption ratio (SAR), this study conducted a joint determination …

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