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Articles 2251 - 2280 of 59516

Full-Text Articles in Earth Sciences

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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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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Table Of Contents, The Editors Dec 2025

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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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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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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An Experimental Study On The Selection Of Slow-Release Carbon Source Materials For Sulfate-Reducing Bacteria-Based Remediation Of High-Sulfate Mine Water In Coal Mines, Xiahou Ming’An, Zhang Li, Xu Zhimin, Guo Juan, Chen Ge, Xiong Xiaofeng, Sun Yajun Dec 2025

An Experimental Study On The Selection Of Slow-Release Carbon Source Materials For Sulfate-Reducing Bacteria-Based Remediation Of High-Sulfate Mine Water In Coal Mines, Xiahou Ming’An, Zhang Li, Xu Zhimin, Guo Juan, Chen Ge, Xiong Xiaofeng, Sun Yajun

Coal Geology & Exploration

Background High-sulfate mine water poses a major aquatic environmental challenge in coal mining areas across China. Accordingly, the cost-effective and efficient treatment of such water has become an urgent need for the sustainable development of the mining industry. Despite its considerable promise, microbial remediation based on sulfate-reducing bacteria (SRB) shows limited efficiency due to the scarcity of dissolved organic carbon (DOC) in mine water.Methods The application of external slow-release carbon source (SRC) materials for SRB faces a range of challenges, such as the potentially excessive release of organic carbon in the initial stage, the unclear release mechanisms of dissolved …

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Failure Mechanisms And Energy Dissipation Characteristics Of Anchorage Bodies Under Dynamic Loading, Wang Changcheng, Yang Ke, Liu Wenjie, Zhang Zhainan, Zheng Shizhang, Xu Rijie, Guo Penghui Dec 2025

Failure Mechanisms And Energy Dissipation Characteristics Of Anchorage Bodies Under Dynamic Loading, Wang Changcheng, Yang Ke, Liu Wenjie, Zhang Zhainan, Zheng Shizhang, Xu Rijie, Guo Penghui

Coal Geology & Exploration

Objective Under intense mining in deep parts of coal mines, the roadway support systems are significantly affected by both far- and near-field dynamic loads, accompanied by the strong deformations of the surrounding rocks. Therefore, investigating the failure mechanisms of anchorage bodies under dynamic loading becomes particularly important. Methods Using the split Hopkinson pressure bar (SHPB) test system and digital image correlation (DIC) technology, the study investigated the mechanical response characteristics of the anchorage bodies under different impact air pressures. Accordingly, it determined dynamic stress-strain relationships, energy dissipation characteristics, cracks’ evolutionary patterns, and failure modes of anchorage bodies. Results and Conclusions …

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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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Self-Adaptive Inverse Wavefield Transform And Derived Pseudo-Wavefield Characteristics Under Roadway-Borehole Observation Of Transient Electromagnetic Data, Fan Kerui, Guo Jianlei, Wang Ruoyu, Zhuang Ming, Fan Fangze, Xu Sheng, Zhao Wentao Dec 2025

Self-Adaptive Inverse Wavefield Transform And Derived Pseudo-Wavefield Characteristics Under Roadway-Borehole Observation Of Transient Electromagnetic Data, Fan Kerui, Guo Jianlei, Wang Ruoyu, Zhuang Ming, Fan Fangze, Xu Sheng, Zhao Wentao

Coal Geology & Exploration

Objective To address the challenge of detecting aquifers outside the roadway excavation contour, this study combined the close-range detection via roadway-borehole transient electromagnetic (TEM) method with the wavefield transform. This will help simultaneously receive detection signals in front of the mining face and outside the roadway excavation contour while also highlighting the boundary information of aquifers. Moreover, to obtain a pseudo-wavefield featuring both reasonable kinematic characteristics and high sensitivity to changes in the electrical structures of strata, this study proposed a self-adaptive algorithm of inverse wavefield transform, thereby improving the accuracy and efficiency of the inverse wavefield transform of roadway-borehole …

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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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Differences In Gas-Bearing Properties Of Deep And Shallow Coal Reservoirs And Their Implications For Coalbed Methane Production In The Western Section Of The Southern Margin Of The Junggar Basin, Xinjiang, Mi Julei, Zhao Changyong, Yang Zhaobiao, Wang Pengli, Li Erting, Zhang Baoxin, Bai Haifeng, Gao Xiuwei, Wang Jianan Dec 2025

Differences In Gas-Bearing Properties Of Deep And Shallow Coal Reservoirs And Their Implications For Coalbed Methane Production In The Western Section Of The Southern Margin Of The Junggar Basin, Xinjiang, Mi Julei, Zhao Changyong, Yang Zhaobiao, Wang Pengli, Li Erting, Zhang Baoxin, Bai Haifeng, Gao Xiuwei, Wang Jianan

Coal Geology & Exploration

Background In recent years, breakthroughs have been constantly achieved in the production of coalbed methane (CBM) at burial depths exceeding 2 000 m in China, with the gas-bearing properties of coal reservoirs identified as a primary geological parameter controlling the CBM production. The western section of the southern margin of the Junggar Basin (also referred to as the study area) hosts abundant CBM resources. In this section, the burial depths of extensive coal seams exceed 2 000 m. However, limited explorations of deep coal reservoirs have restricted a systematic understanding of the gas-bearing properties of coal reservoirs in the study …

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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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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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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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An Automated Attitude Control Method For The Rotary Steerable System And Its Validation Through Hardware-In-The-Loop Simulation, Zhang Nan, Ren Bai’An, Li Fei, Liu Ziqi, Lyu Fangxing Dec 2025

An Automated Attitude Control Method For The Rotary Steerable System And Its Validation Through Hardware-In-The-Loop Simulation, Zhang Nan, Ren Bai’An, Li Fei, Liu Ziqi, Lyu Fangxing

Coal Geology & Exploration

Objective The traditional manual control mode of a rotary steerable system (RSS) faces challenges, including response delay and low control efficiency. To address these challenges, this study proposed a closed-loop automated attitude control method for the RSS and verified its effectiveness through hardware-in-loop (HIL) simulation. Methods This study focuses on the drilling process of a point-the-bit RSS. In the case of deviations between measured and target attitudes, the control parameters were calculated based on the deviation signals using a closed-loop controller, driving the RSS actuator to conduct trajectory correction. Afterward, the actual attitude was yielded and then entered the input …

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Co2-Water Displacement Characteristics Of Saturated Sandstones With Different Pore Structures, Liu Ting, Li Jinglin, Li Yi, Dan Wendong, Diao Yujie, Ma Xin Dec 2025

Co2-Water Displacement Characteristics Of Saturated Sandstones With Different Pore Structures, Liu Ting, Li Jinglin, Li Yi, Dan Wendong, Diao Yujie, Ma Xin

Coal Geology & Exploration

Objective The pore structures of clastics play a crucial role in assessing the potential of saline aquifers for geologic CO2 sequestration. Current studies on pore structures during CO2 sequestration focus primarily on artificial cores. However, compared to artificial cores, natural cores feature more complex pore size distributions and stronger heterogeneity. Methods This study examined a natural core from deep reservoirs in the Ordos Basin and two artificial cores with different porosities through CO2-water displacement experiments under water-saturated conditions. Using a nuclear magnetic resonance (NMR) analysis and imaging system for multiphase fluid displacement, this study analyzed the …

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Multi-Field Coupling-Based Numerical Simulations Of Co2 Storage In Saline Aquifers: A Case Study Of The Dingji Coal Mine, Huainan Mining Area, Li Dianshang, Zheng Sijian, Liao Qingfa, Miao Wei, Tian Yuchen, Zhang Helong, Liu Yanzhi, Liu Shiqi Dec 2025

Multi-Field Coupling-Based Numerical Simulations Of Co2 Storage In Saline Aquifers: A Case Study Of The Dingji Coal Mine, Huainan Mining Area, Li Dianshang, Zheng Sijian, Liao Qingfa, Miao Wei, Tian Yuchen, Zhang Helong, Liu Yanzhi, Liu Shiqi

Coal Geology & Exploration

Background Saline aquifers are characterized by extensive distribution, abundant reserves, and substantial potential for CO2 storage, establishing them as the most promising geological media for carbon capture, utilization, and storage (CCUS). CO2 storage in saline aquifers plays a crucial role in mitigating the greenhouse effect and achieving the goals of peak carbon dioxide emissions and carbon neutrality. Thoroughly investigating CO2 storage in deep saline aquifers within the Huainan mining area helps alleviate the regional pressure of carbon emission reduction while also providing important support for expanding the technical pathways of CCUS and promoting its engineering applications. Methods …

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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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Advances In Research On The Policies, Technologies, And Demonstration Projects Of Geologic Co2 Sequestration In China, Zhao Yue, Yang Xuechao, Chen Xiaodong, Chang Jia, Wei Hengfei, Liu Zhibang, Liu Hui Dec 2025

Advances In Research On The Policies, Technologies, And Demonstration Projects Of Geologic Co2 Sequestration In China, Zhao Yue, Yang Xuechao, Chen Xiaodong, Chang Jia, Wei Hengfei, Liu Zhibang, Liu Hui

Coal Geology & Exploration

Background Carbon capture, utilization, and storage (CCUS) is considered a key technology to promote large-scale carbon dioxide (CO2) emission reduction. Against the backdrop of achieving its goals of carbon neutrality and peak carbon dioxide emissions, China faces a tremendous challenge of CO2 emission reduction. This situation will provide new driving forces for the development of geologic CO2 sequestration while also imposing higher requirements for technical innovation and industrialization of the technology. Methods and Advances This study systematically reviews the development process of policies on CCUS of China over the past two decades, with over 30 policies …

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Mechanisms Governing Co2 Mineral Trapping And Cementitious Activity Degradation Of Solid Waste-Based Backfill Materials, Liu Zhifei, Chen Qingting, Li Hongjie, Wang En, Zhao Heming Dec 2025

Mechanisms Governing Co2 Mineral Trapping And Cementitious Activity Degradation Of Solid Waste-Based Backfill Materials, Liu Zhifei, Chen Qingting, Li Hongjie, Wang En, Zhao Heming

Coal Geology & Exploration

Objective This study investigated three types typical alkaline industrial solid waste: steel slag, fly ash, and bottom ash, highlighting the differences in their CO2 mineral trapping efficiency and the degradation patterns of their cementitious activity after carbon fixation. The purpose is to reveal the mechanisms underlying CO2 mineral trapping in solid waste and evaluate their application potential in backfill engineering, thereby promoting the synergistic development of industrial solid waste recycling and carbon emission reduction. Methods Through experiments on CO2 mineral trapping using the direct wet method, the kinetics and product characteristics of solid waste-CO2 interactions were …

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Impacts Of Anti-Rock Burst Multistage Hydraulic Fracturing Using Horizontal Wells On Mining Roadways And Fracture Control Techniques: A Case Study Of Mining Facein The Zhaoxian Coal Mine, Shaanxi Province, Liu Xiugang, Jiang Zaibing, Yang Juan, Liu Mingjun, Pang Tao, Wu Weixing, Tu Xiaolong, Mo Haitao, Guo Xiaolong, Du Xinfeng Dec 2025

Impacts Of Anti-Rock Burst Multistage Hydraulic Fracturing Using Horizontal Wells On Mining Roadways And Fracture Control Techniques: A Case Study Of Mining Facein The Zhaoxian Coal Mine, Shaanxi Province, Liu Xiugang, Jiang Zaibing, Yang Juan, Liu Mingjun, Pang Tao, Wu Weixing, Tu Xiaolong, Mo Haitao, Guo Xiaolong, Du Xinfeng

Coal Geology & Exploration

Objective Surface multistage hydraulic fracturing of hard roofs using horizontal wells serves as an important technique for rock burst control in mines. However, fracturing technique under improper control might pose adverse impacts on excavated mining roadways underground, causing roadway deformation, mesh failure with block falling, and the flow of fracturing fluids into the roadways. Methods This study investigated certain mining face of the Zhaoxian Coal Mine in the Yonglong mining area, Shaanxi Province. Targeting different characteristics and phenomena of roadways following hydraulic fracturing, this study analyzed the reasons why fracturing fluids flowed into roadways during hydraulic fracturing using theoretical analysis, …

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Lithofacies Paleogeography Of The Ordovician Kelimoli-Lashizhong Formations Along The Western Margin Of The Ordos Basin, Wang Weibin, Ma Zhanrong, Hu Aiping, Zhang Qian, Li Wenhou, Chen Qiang, Ma Yao, Wang Yanbo Dec 2025

Lithofacies Paleogeography Of The Ordovician Kelimoli-Lashizhong Formations Along The Western Margin Of The Ordos Basin, Wang Weibin, Ma Zhanrong, Hu Aiping, Zhang Qian, Li Wenhou, Chen Qiang, Ma Yao, Wang Yanbo

Coal Geology & Exploration

Objective The period during the deposition of the Middle-Late Ordovician Kelimoli-Lashizhong formations witnessed a key transition of the tectonic framework along the western margin of the Ordos Basin. Investigating the lithofacies paleogeography of these formations can reveal the tectono-sedimentary responses during this period, thereby providing a basis for the resource potential prediction, exploration, and exploitation of natural gas in the study area. Methods Using field section observations, core observations, and log interpretations, as well as previous research results, this study comprehensively analyzed the Middle-Late Ordovician strata in the Ordos Basin from the perspectives of stratigraphy, sedimentary system division, and sedimentary …

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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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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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