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Full-Text Articles in Oil, Gas, and Energy

Reflections And Implementation Strategies For Constructing A Standard System For Deep Coalbed Methane Exploration And Exploitation, Chen Xinjun, Liu Zengqin, Shen Baojian, Zhao Shihu, Zhang Jiaqi, Ye Jincheng Apr 2025

Reflections And Implementation Strategies For Constructing A Standard System For Deep Coalbed Methane Exploration And Exploitation, Chen Xinjun, Liu Zengqin, Shen Baojian, Zhao Shihu, Zhang Jiaqi, Ye Jincheng

Coal Geology & Exploration

Objective Deep coalbed methane (CBM; burial depths: > 1500 m) in China holds considerable resource potential. As a strategic clean energy, deep CBM is exhibiting increasingly high value of exploitation and utilization. This is of great practical significance for China’s energy structure transformation and the achievement of peak carbon dioxide emissions and carbon neutrality in the country. In recent years, breakthroughs have been made in deep CBM exploration in basins such as Ordos, Sichuan, and Junggar, with a single-well daily gas production exceeding 100 000 m3, marking the initial achievement of large-scale deep CBM exploitation. However, the existing standard …

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Dynamic Gas Supply Mechanism And Theoretical Production Modes Of Free Gas-Rich Deep Coal Reservoirs, Chen Shida, Zhang Taiyuan, Tang Dazhen, Xu Hao, Tao Shu, Li Song, Tang Shuling Apr 2025

Dynamic Gas Supply Mechanism And Theoretical Production Modes Of Free Gas-Rich Deep Coal Reservoirs, Chen Shida, Zhang Taiyuan, Tang Dazhen, Xu Hao, Tao Shu, Li Song, Tang Shuling

Coal Geology & Exploration

Objective and Methods The production processes of adsorbed and free gases and the dynamic partitioning mechanism behind the production efficiency of both gas types are critical scientific issues to be addressed urgently in the exploration and production of deep coalbed methane (CBM). Based on the test and assay data of cores from exploration wells, this study systematically analyzed the theoretical production of deep CBM resources. By integrating the building of mathematical and numerical models, carbon isotope monitoring of methane, and the analysis of production curves, this study revealed the spatiotemporal evolutionary processes of production-induced pressure drop expansion, adsorbed gas desorption, …

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An Experimental Study Of Ch4 Displacement By Co2 Under Varying Initial Reservoir Pressures, Xu Jiang, Jiang Shiyu, Peng Shoujian, Wang Zhonghui, Chen Jiaxuan, Niu Huiting Apr 2025

An Experimental Study Of Ch4 Displacement By Co2 Under Varying Initial Reservoir Pressures, Xu Jiang, Jiang Shiyu, Peng Shoujian, Wang Zhonghui, Chen Jiaxuan, Niu Huiting

Coal Geology & Exploration

Objective This study aims to reveal the evolutionary patterns of reservoir parameters during the CO2-enhanced coalbed methane (CO2-ECBM) recovery and the impact of initial reservoir pressure on CBM recovery by gas injection. Methods Based on the multi-field coupling-based physical simulation experiment system of gas injection into coal seams for production growth, this study conducted experiments of CH4 displacement by CO2 under a constant gas injection pressure of 2.0 MPa and initial reservoir pressures of 1.5 MPa, 1.0 MPa, and 0.5 MPa. Accordingly, this study explored the spatiotemporal evolutionary patterns of multiphysical field parameters such …

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Parameter Optimization For Multistage Horizontal Well Fracturing Based On Multi-Cluster Perforation For Deep Coal Measure Gas: A Case Study Of The Jurassic Baijiahai Area In The Junggar Basin, Wang Bo, Jin Chenghong, Liu Jiang, Wang Zhiwei, Li Shenjian, Sheng Mao Apr 2025

Parameter Optimization For Multistage Horizontal Well Fracturing Based On Multi-Cluster Perforation For Deep Coal Measure Gas: A Case Study Of The Jurassic Baijiahai Area In The Junggar Basin, Wang Bo, Jin Chenghong, Liu Jiang, Wang Zhiwei, Li Shenjian, Sheng Mao

Coal Geology & Exploration

Objective The multistage horizontal well fracturing based on multi-cluster perforation has emerged as an effective approach for the efficient production of deep coal-measure gas (CMG). However, deep coals feature unique rock mechanical properties, fluid loss characteristics of reservoirs, and microfracture developmental characteristics, which differ significantly from those of unconventional shales, tight sandstones, and shallow coals. As a result, existing fracturing experience cannot be directly applied, highlighting the investigation of fracturing parameter optimization tailored for deep CMG production.Methods Focusing on deep CMG reservoirs in the Baijiahai area within the Junggar Basin, this study constructed a model of multistage horizontal well …

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Measures And Effects Of Eco-Geological Restoration In Well No.4 In The Muli Mining Area, Qinghai Province, China, Zhao Xin, Wang Tong, Wang Weichao, Li Congcong, Li Fei, Jiang Zhikun, Li Jin Apr 2025

Measures And Effects Of Eco-Geological Restoration In Well No.4 In The Muli Mining Area, Qinghai Province, China, Zhao Xin, Wang Tong, Wang Weichao, Li Congcong, Li Fei, Jiang Zhikun, Li Jin

Coal Geology & Exploration

Objective The Muli mining area, located in the hinterland of the Qilian Mountains, Qinghai Province, serves as the source of the Datong River—a major tributary of the Yellow River. This area falls within the alpine permafrost region, exhibiting a sensitive, fragile ecosystem. In the early 21st century, disordered coal mining in this area has caused ecological damage. This has notably posed four challenges in the ecological restoration of well No.4 in this area: (1) high, steep, and unstable slopes of spoil heaps; (2) a large volume of water accumulating in mining pits; (3) permafrost excavation and destruction, and (4) land …

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Advances In Research On Lithium In Coal-Bearing Strata And Its Isotopes, Zhang Yun, Wei Yingchun, Cao Daiyong, Li Xin, Jin Liangliang, Dong Bo, Wang Xin Apr 2025

Advances In Research On Lithium In Coal-Bearing Strata And Its Isotopes, Zhang Yun, Wei Yingchun, Cao Daiyong, Li Xin, Jin Liangliang, Dong Bo, Wang Xin

Coal Geology & Exploration

Significance Lithium serves as a significant strategic metal in emerging industries, and lithium isotopes have become crucial geochemical tracers due to their pronounced mass-dependent fractionation effects. Therefore, lithium minerals in coal-bearing strata have emerged as a priority in recent exploration of strategic metallic mineral resources. Investigating the isotopic composition and variation of lithium in coal-bearing strata helps reveal the sources, migration, and enrichment process of lithium while also providing a theoretical basis for lithium exploration and exploitation in coal-bearing strata. Advances This study offers a summary of advances in research on lithium in coal-bearing strata and its isotopes from three …

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Multi-Field Information Fusion-Based Analysis Of The Macroscopic And Mesoscopic Damage Evolution And Location Identification Of Caving And Water-Conducting Fracture Zones For Mining Overburden, Wei Jiangbo, Wang Shuangming, Liu Lang, Wei Baoning, Chong Deyu, Liu Zhizhen, Li Dongkui, Zhuang Dengdeng, Zhou Jing Apr 2025

Multi-Field Information Fusion-Based Analysis Of The Macroscopic And Mesoscopic Damage Evolution And Location Identification Of Caving And Water-Conducting Fracture Zones For Mining Overburden, Wei Jiangbo, Wang Shuangming, Liu Lang, Wei Baoning, Chong Deyu, Liu Zhizhen, Li Dongkui, Zhuang Dengdeng, Zhou Jing

Coal Geology & Exploration

Objective For the coal mining areas in the middle reaches of the Yellow River, there is an urgent need to determine the failure characteristics of the mining overburden and the spatial structural evolution of caving and water-conducting fracture zones in the overburden, which is recognized as the major challenge in coal mining through gangue grouting filling in goaves. Methods To accurately identify the locations of the caving and water-conducting fracture zones in the mining overburden, this study investigated mining face 42205 in the Liangshuijing Coal Mine in northern Shaanxi Province. Using drilling data, this study constructed a numerical model of …

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Intelligent Identification Of The Acoustic Emission Characteristics And Crack Propagation States During Of Coal Failure Based On The Nrbo-Xgboost Model, Zhang Tianjun, Cao Xinshuang, Song Shuang, He Suinan, Xue Yilun, Liu Guoying, Chen Juntao Apr 2025

Intelligent Identification Of The Acoustic Emission Characteristics And Crack Propagation States During Of Coal Failure Based On The Nrbo-Xgboost Model, Zhang Tianjun, Cao Xinshuang, Song Shuang, He Suinan, Xue Yilun, Liu Guoying, Chen Juntao

Coal Geology & Exploration

Objective The dynamic hazards of coals are intimately associated with the complexity and uncertainty of coal failure, while accurately identifying the propagation states of coal cracks serves as a critical approach to investigating the instability failure of coals. However, the current identification methods based on the physical quantities of acoustic emission suffer from slow speeds and low efficiency, failing to meet the demand for safe, efficient, and intelligent mining of coal mines. Methods To achieve the intelligent identification of the crack propagation states of coals, this study constructed an optimization model based on the Newton-Raphson-based optimizer (NRBO) and the eXtreme …

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Effects Of Coal Seam Dip Angle On Asymmetric Load Transfer Paths In The Overburden Of Inclined Stopes, Zhu Kaipeng, Luo Shenghu, Xie Panshi, Li Zhilin, Fan Juan, Tian Chengyang, Yi Leilei, Xu Hui Apr 2025

Effects Of Coal Seam Dip Angle On Asymmetric Load Transfer Paths In The Overburden Of Inclined Stopes, Zhu Kaipeng, Luo Shenghu, Xie Panshi, Li Zhilin, Fan Juan, Tian Chengyang, Yi Leilei, Xu Hui

Coal Geology & Exploration

Objectives The coal seam dip angle is recognized as the root cause of far more complex load transfer paths in the overburden of inclined stopes compared to those of common coal seams. A clear understanding of the effects of the coal seam dip angle on the load transfer paths holds great significance for the stability control of surrounding rocks in inclined coal seams. Methods Based on the engineering background of a certain coal mine in Xinjiang, this study investigated the asymmetric deformations and failure of the overburden in inclined stopes using physical similar material simulation experiments, finite element numerical simulations, …

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Operation Strategy Simulation Of The Heating System For Moderately Deep Geothermal Resources, Zhao Yongzhe, Zhao Baofeng, Hu Zhenyang, Gou Li, Du Dingshan, Liu Chenglu Apr 2025

Operation Strategy Simulation Of The Heating System For Moderately Deep Geothermal Resources, Zhao Yongzhe, Zhao Baofeng, Hu Zhenyang, Gou Li, Du Dingshan, Liu Chenglu

Coal Geology & Exploration

Background The active utilization of moderately deep geothermal resources for heating serves as a critical measure to achieve the goals of peak carbon dioxide emissions and carbon neutrality. Meanwhile, the effectiveness of the operation strategies of the heating system using these resources directly influences heating performance and significantly affects the energy consumption of the heating system. It is necessary to prevent resource waste while utilizing geothermal energy. Methods Based on a heating project using moderately deep geothermal resources in the Guanzhong Basin, Shaanxi Province, this study established a dynamic simulation model using the TRNSYS transient simulation software. Then, this study …

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Fracture Activation In The Overburden And Aquiclude Stability Under The Mining Of Close-Distance Coal Seams, Cao Jian, Su Haitao, Wang Chao, Li Jianwei, Li Liang, Mao Xuwei Apr 2025

Fracture Activation In The Overburden And Aquiclude Stability Under The Mining Of Close-Distance Coal Seams, Cao Jian, Su Haitao, Wang Chao, Li Jianwei, Li Liang, Mao Xuwei

Coal Geology & Exploration

Background In the Jurassic coalfield of northern Shaanxi Province, the repeated mining of close-distance coal seams exacerbates the activation of fractures in the overburden. This is prone to cause aquiclude instability, leading to groundwater loss. Methods This study aims to reveal the characteristics of fractures in the overburden and the aquiclude stability in the mining of close-distance coal seams. Using a method combining measurement statistics, physical simulations using similar materials, and theoretical analysis, this study proposed categorizing primary coal-rock combinations based on the water-preserved mining of close-distance coal seams in the Jurassic coalfield of northern Shaanxi. Additionally, this study analyzed …

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Inversion Of Electric Field Component EX In The Sotem Method Based On The Improved Particle Swarm Optimization Algorithm, Zhang Jifeng, Chen Changjian, Li Yuteng, You Xiran, Ma Ziben Apr 2025

Inversion Of Electric Field Component EX In The Sotem Method Based On The Improved Particle Swarm Optimization Algorithm, Zhang Jifeng, Chen Changjian, Li Yuteng, You Xiran, Ma Ziben

Coal Geology & Exploration

Objective The inversion of the horizontal electric field component in the grounded-source short offset transient electromagnetic (SOTEM) method using traditional algorithms is prone to fall into local extrema. To address this challenge, this study proposed an improved particle swarm optimization (PSO) algorithm that integrates the center of gravity reverse learning strategy. Methods Based on the center of gravity reverse learning strategy, the improved PSO algorithm can dynamically adjust learning factors and the value of the adaptive inertia weight, thus improving the global search capability and convergence efficiency effectively. The performance of the improved PSO algorithm was verified using the typical …

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Characteristics Of Dynamic Mode Ⅱ Fracture Of Frozen Saturated Sandstones Under Varying Low Temperatures And Loading Rates, Zhao Tao, Cui Zhao, Jia Hailiang, Yang Guangyu Apr 2025

Characteristics Of Dynamic Mode Ⅱ Fracture Of Frozen Saturated Sandstones Under Varying Low Temperatures And Loading Rates, Zhao Tao, Cui Zhao, Jia Hailiang, Yang Guangyu

Coal Geology & Exploration

Background Investigating the mode Ⅱ fracture of frozen saturated sandstones under dynamic disturbances, including changes in their critical stress intensity factor (SIF; i.e., fracture toughness) and energy dissipation mechanisms, is crucial for the safe excavation of frozen wellbores through drilling and blasting in coal mines. Methods Using a split Hopkinson pressure bar (SHPB), this study conducted experiments on the dynamic mode Ⅱ fracture of a sandstone specimen using the short core in compression (SCC) method (also referred to as dynamic SCC experiments) under varying temperatures and loading rates. Accordingly, this study analyzed the SIF versus time curves of the frozen …

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An Experimental Study On The Yield Strength Of Cement Grout For Grouting In The Limestone Area Of A Coal Seam Floor, Zou Jun, Guo Yan, Gui Herong, Wang Weimin, Chen Zhenlin, Liu Faming, Dai Yanan, Hu Yang, Chen Zengbao, Li Jun, Gao Chuan, Li Heng Apr 2025

An Experimental Study On The Yield Strength Of Cement Grout For Grouting In The Limestone Area Of A Coal Seam Floor, Zou Jun, Guo Yan, Gui Herong, Wang Weimin, Chen Zhenlin, Liu Faming, Dai Yanan, Hu Yang, Chen Zengbao, Li Jun, Gao Chuan, Li Heng

Coal Geology & Exploration

Objective and Methods In recent years, regional grouting through ground directional drilling has become the preferred technique for water disaster prevention and control in floor limestones in a coal mining area. In grouting engineering, the diffusion radius of cement grout, which has always received wide attention, is constrained by multiple factors including the shear yield strength (yield strength for short) and specific gravity of cement grout, along with grouting pressure. The diffusion radius in turn influences the implementation effects of on-site grouting engineering. Among its controlling factors, the yield strength of cement grout cannot be tested on site. Given this, …

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Critical Technical Parameters Of Large-Diameter Multi-Stage Casing Drilling For Mine Rescue, Xu Chao, Yao Ningping, Jiang Lei, Tian Hongjie, Liu Zhi, Zhu Ning Apr 2025

Critical Technical Parameters Of Large-Diameter Multi-Stage Casing Drilling For Mine Rescue, Xu Chao, Yao Ningping, Jiang Lei, Tian Hongjie, Liu Zhi, Zhu Ning

Coal Geology & Exploration

Objective This study aims to meet the needs of mine rescue in cave-in accidents occurring in narrow underground spaces and to address the contradiction between equipment miniaturization and the drilling of large-diameter rescue boreholes under complex collapse conditions. Based on the goal of constructing a 60-m-long rescue passageway, this study developed a dual-power, composite drilling process based on multi-stage casing drilling technology for large-diameter horizontal rescue boreholes under complex collapse conditions. Furthermore, this study investigated the critical drilling parameters, aiming to provide a basis for the function development and parameter formulation of rescue equipment. Methods This study designed supporting three-stage …

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Application Of Five Seismic Attributes In Natural Fracture Prediction For Deep Coalbed Methane Production Along The Eastern Margin Of The Ordos Basin, Tong Jiangnan, Wang Feng, Zhang Feng, Hou Wei, Li Zhongbai, Ji Liang, Jiang Yanan, Sun Wei Apr 2025

Application Of Five Seismic Attributes In Natural Fracture Prediction For Deep Coalbed Methane Production Along The Eastern Margin Of The Ordos Basin, Tong Jiangnan, Wang Feng, Zhang Feng, Hou Wei, Li Zhongbai, Ji Liang, Jiang Yanan, Sun Wei

Coal Geology & Exploration

Background Natural fractures serve as both the primary storage space for free gas of deep coalbed methane (CBM) and pathways for hydrocarbon migration. Furthermore, these fractures can enhance the porosity and permeability of strata under the deep, high-pressure condition, significantly amplifying the permeability of coal seams. Therefore, the fine-scale characterization of the planar distribution of natural fractures is crucial to deep CBM production.Objectives and Methods This study investigated the No.8 coal seam in the Carboniferous Benxi Formation within the Daning-Jixian block on the eastern margin of the Ordos Basin. Through offset vector tiles (OVT) domain processing of offshore 3D …

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Seepage Evolution Patterns And Self-Sealing Characterization Of Mining-Induced Overburden Fractures In Ecologically Vulnerable Mining Areas, Li Jianwei, Sun Yanchao, Zhang Chuanjiu, Ta Xupeng, Cao Jian, Zhang Jian Mar 2025

Seepage Evolution Patterns And Self-Sealing Characterization Of Mining-Induced Overburden Fractures In Ecologically Vulnerable Mining Areas, Li Jianwei, Sun Yanchao, Zhang Chuanjiu, Ta Xupeng, Cao Jian, Zhang Jian

Coal Geology & Exploration

Objective The ecologically vulnerable areas (EVAs) in West China have been significantly affected by coal mining. In these areas, aquifers overlying goaves have been damaged under mining disturbance, being prone to cause water resource loss and desertification. Hence, it is crucial to guide the self-sealing of fractures artificially to preserve and further restore the groundwater level.Methods This study investigated mining face 22108 in the Buertai coal mine in the Inner Mongolia Autonomous Region. Based on the physical simulation experiments using similar materials, numerical calculations, and theoretical analysis, this study delved into the seepage evolution patterns of fractures in the …

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Table Of Contents, The Editors Mar 2025

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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Geological Technological Innovations And Contributions In The Exploration And Development Of The Shenfu Coalfield, Fan Limin Mar 2025

Geological Technological Innovations And Contributions In The Exploration And Development Of The Shenfu Coalfield, Fan Limin

Coal Geology & Exploration

Background The discovery and exploration of the Shenfu coalfield (i.e., a Jurassic coalfield in northern Shaanxi Province) represent the most significant achievement in China’s coal industry during the 6th Five-Year Plan of the country, marking the onset of the strategic westward shift of China’s coal industry. The complex discovery and exploration processes of the Shenfu coalfield have yielded valuable technological innovations. A summary of advances in the geological exploration and research of this coalfield will provide significant implications and references for the geologic work and green development of major coal-producing areas in West China. Advances First, research on the coal …

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Mining-Induced Fault Slip: Assessment Model And Method For Determining Fault Instability Ranges, Zhao Hongbao, Zhang Bo, Zhang Chi, Ji Dongliang Mar 2025

Mining-Induced Fault Slip: Assessment Model And Method For Determining Fault Instability Ranges, Zhao Hongbao, Zhang Bo, Zhang Chi, Ji Dongliang

Coal Geology & Exploration

Objective Faults are highly susceptible to activation and slip instability under the influence of mining. This might trigger many disasters such as mine earthquakes, posing serious threats to mine safety. Therefore, it is necessary to analyze the mechanical mechanisms behind mining-induced fault activation and determine the ranges of mutual feedback between mining and fault activation in advance. Methods With the 213B mining face of the Xinzhi coal mine as the engineering background, this study analyzed the fault activation process induced by mining and created an elastic mechanical model for the impacts of mining on the surrounding rocks of faults. Accordingly, …

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Geological Characteristics And Key Technologies For Exploration And Development Of The Yanchuannan Coalbed Methane Field, Ordos Basin, He Xipeng, Xiao Cui, Gao Yuqiao, Li Xin, Guo Tao, Cai Xiao Mar 2025

Geological Characteristics And Key Technologies For Exploration And Development Of The Yanchuannan Coalbed Methane Field, Ordos Basin, He Xipeng, Xiao Cui, Gao Yuqiao, Li Xin, Guo Tao, Cai Xiao

Coal Geology & Exploration

Objective China boasts abundant coalbed methane (CBM) resources, which serve as a crucial replacement for the reserve growth and production addition of natural gas resources. In recent years, CBM exploration and production have gradually expanded into deep, thin coal seams, which, however, are characterized by strong heterogeneity, ultra-low permeability, high in situ stress, and complex enrichment patterns. Therefore, the exploration and exploitation of deep, thin coal seams face challenges such as inadequate geological theories, poor adaptability of key technologies, and low investment returns, which hinder large-scale commercial CBM production. Methods Focusing on the exploration and exploitation practice of middle-deep, thin …

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Exploring Sandstone-Hosted Uranium Deposits In Coal-Bearing Basins Using Geophysical Methods: A Case Study Of The East-Central Erlian Basin, Liang Jiangang, Kuang Haiyang, Cao Zhanning, Yang Weimin Mar 2025

Exploring Sandstone-Hosted Uranium Deposits In Coal-Bearing Basins Using Geophysical Methods: A Case Study Of The East-Central Erlian Basin, Liang Jiangang, Kuang Haiyang, Cao Zhanning, Yang Weimin

Coal Geology & Exploration

Background Sandstone-hosted uranium deposits, critical to the uranium resources growth in China, are extensively distributed in continental and marine-continental transitional sedimentary rocks. Currently, the exploration and research on these deposits in China focus primarily on the Meso-Cenozoic sedimentary basins in the northern regions. Objective and Methods‌ The Erlian Basin exhibits the coexistence of uranium, coals, and oil. This study investigated the east-central part of this basin using multiple geophysical data, including regional gravity survey, aeromagnetic survey, and airborne radioactivity survey (ARS). Furthermore, six 2D seismic profiles totaling 130 km in length were deployed, and instantaneous soil radon measurement as employed. …

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Impacts Of Diamond Particle Sizes On Performance Of Ni-Cu Superhydrophobic Coatings On Drilling Tool Surfaces, Wen Qi, Li Tao, Duan Longchen, Pan Bingsuo Mar 2025

Impacts Of Diamond Particle Sizes On Performance Of Ni-Cu Superhydrophobic Coatings On Drilling Tool Surfaces, Wen Qi, Li Tao, Duan Longchen, Pan Bingsuo

Coal Geology & Exploration

Objective Applying superhydrophobic coatings on drilling tool surfaces can effectively alleviate the challenges posed by drill bit balling and core barrel blockage. However, the limited mechanical stability of superhydrophobic coatings has somewhat hindered their widespread application in practical operations. Methods To improve the durability of superhydrophobic coatings, this study co-deposited diamond micropowder into Ni-Cu composite coating using composite electrodeposition, followed by surface modification using 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (PFDTES). Employing a variety of testing methods, this study investigated the impacts of the mass fractions of diamonds with particle sizes of 1 μm and 20 μm (also referred to as diamonds W1 and W20, …

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Primary Geological Characteristics, Advances In Exploration And Production, And Strategies Of Coalbed Methane In South China, Guo Tao, Zhou Yatong, Jin Xiaobo, Gao Xiaokang, Peng Xingping Mar 2025

Primary Geological Characteristics, Advances In Exploration And Production, And Strategies Of Coalbed Methane In South China, Guo Tao, Zhou Yatong, Jin Xiaobo, Gao Xiaokang, Peng Xingping

Coal Geology & Exploration

Objective and Methods South China contains abundant coalbed methane (CBM) resources from numerous, superimposed, thin coal seams, serving as a significant replacement for China’s CBM exploration and production in the future. Despite significant progress in recent years, the CBM industry still faces several challenges in comprehensive and effective production. To accelerate its development, this study summarizes the primary geological characteristics of CBM resources in South China, organizes the current status and advances in CBM exploration and production in this region, and proposes corresponding technical strategies. Results The results indicate that the abundant CBM resources in South China exhibit coal seams …

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Stratigraphic Characteristics And Shale Gas Enrichment Interval Distribution Of The Lower Cambrian Qiongzhusi Formation, Upper Yangtze Region, China, Wang Hongyan, Shi Zhensheng, Zhao Qun, Zhou Tianqi, Wang Pengfei Mar 2025

Stratigraphic Characteristics And Shale Gas Enrichment Interval Distribution Of The Lower Cambrian Qiongzhusi Formation, Upper Yangtze Region, China, Wang Hongyan, Shi Zhensheng, Zhao Qun, Zhou Tianqi, Wang Pengfei

Coal Geology & Exploration

Objective Shales in the Lower Cambrian Qiongzhusi Formation within the Upper Yangtze region preserve critical information about primitive oceans. Furthermore, these shales serve as vital source rocks and reservoirs, having demonstrated considerable potential for shale gas exploration. Methods Using seismic, borehole, and outcrop data, this study investigated the shale strata and their distribution in the Qiongzhusi Formation through comparative analysis. Accordingly, the sweet-spot interval was determined. Results and conclusions The results indicate that the Lower Cambrian Qiongzhusi Formation in the Upper Yangtze region can be divided into the first and second members (also referred to as the Qiong 1 and …

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Advances In Research On Technologies For Large-Scale Coal Gangue Utilization For Green Mine Construction, Shi Quanlin, Long Lihua, Yang Qian, Wang Shaohui, Xie Dawei Mar 2025

Advances In Research On Technologies For Large-Scale Coal Gangue Utilization For Green Mine Construction, Shi Quanlin, Long Lihua, Yang Qian, Wang Shaohui, Xie Dawei

Coal Geology & Exploration

Background The coal gangue, a solid waste, features high production and a continuous increase in the amount piled in China. The long-term piling up of coal gangue will cause the waste of land resources and environmental pollution in mining areas. Various methods for utilizing coal gangue, such as preparing high-value-added chemical products and extracting useful elements, suffer a limited consumption capacity, failing to meet the requirements of large-scale disposal and utilization of solid wastes and green mine construction. Advances The comprehensive utilization of coal gangue for mining area reclamation and underground backfilling represents a critical direction for its large-scale disposal …

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Advances In Research On The Mechanical Responses Of Hot Dry Granites Under Varying Cooling Conditions In China, Xie Jingyu, Song Jiwei, Sui Jiancai, Zhao Meng, Wang Ren, Zeng Chong, Wang Jianlong Mar 2025

Advances In Research On The Mechanical Responses Of Hot Dry Granites Under Varying Cooling Conditions In China, Xie Jingyu, Song Jiwei, Sui Jiancai, Zhao Meng, Wang Ren, Zeng Chong, Wang Jianlong

Coal Geology & Exploration

Significance Enhanced geothermal systems (EGSs) serve as a key technique for exploiting hot dry rocks (HDRs) presently. During the construction and operation of EGSs, rocks of the HDR reservoirs will experience various cooling conditions, such as natural cooling, cyclic cooling, and water cooling, rendering it greatly significant to investigate the mechanical response characteristics of granites—typical HDRs—under varying cooling conditions. Advances This study offers a summary and analysis of experimental data about the mechanical responses, i.e., uniaxial compressive strength (σc), elastic modulus (E), tensile strength (σt), and Poisson's ratio (ν), of …

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An Edge Awareness-Enhanced Visual Slam Method For Underground Coal Mines, Mu Qi, Liang Xin, Guo Yuanjie, Wang Yuhao, Li Zhanli Mar 2025

An Edge Awareness-Enhanced Visual Slam Method For Underground Coal Mines, Mu Qi, Liang Xin, Guo Yuanjie, Wang Yuhao, Li Zhanli

Coal Geology & Exploration

Objective Underground coal mines commonly exhibit low illuminance, weak textures, and structuralization-induced feature degradation. These scenes lead to challenges of insufficient effective features and high mismatch rates to the visual simultaneous localization and mapping (SLAM) system, severely compromising its localization accuracy and robustness. Methods This study proposed an edge awareness-enhanced visual SLAM method. First, an edge-awareness constrained low-illuminance image enhancement module was developed. Specifically, images with clear textures and uniform illumination were obtained using the Retinex algorithm optimized using an adaptive gradient-domain guided filter. This significantly improved feature extraction performance under low and uneven lighting conditions. Second, an edge awareness-enhanced …

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Engineering Practice Of Advance Gas Control For Crushed Soft Coal Seams Through Directional Fracturing Using A Long Borehole In The Coal Seam Roof, Jia Bingyi, Li Shugang, Chen Dongdong, Zhang Qun Mar 2025

Engineering Practice Of Advance Gas Control For Crushed Soft Coal Seams Through Directional Fracturing Using A Long Borehole In The Coal Seam Roof, Jia Bingyi, Li Shugang, Chen Dongdong, Zhang Qun

Coal Geology & Exploration

Objective and Methods The crushed soft coal seams susceptible to intense coal and gas outbursts exhibit high gas content and pressure. Consequently, during borehole drilling for regional gas pre-drainage in such coal seams, high blowout intensity is prone to cause gas overrun and low drilling efficiency. To accelerate its development, this study analyzed the status and adaptability of existing technologies for regional advance gas drainage and pressure relief, as well as the fracture propagation characteristics of coal seam roofs during indirect fracturing using boreholes near the roofs. Accordingly, this study proposed an advance gas drainage and pressure relief technology for …

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Dynamic Evolutionary Pattern Of Fractures In Tectonically Deformed Coal-Bearing Assemblages During Loading, Zhao Pengxiang, Liu Yingying, Li Shugang, Liu Yanqun, Liu Yunchuan, Wang Laolao, Lu Weidong Mar 2025

Dynamic Evolutionary Pattern Of Fractures In Tectonically Deformed Coal-Bearing Assemblages During Loading, Zhao Pengxiang, Liu Yingying, Li Shugang, Liu Yanqun, Liu Yunchuan, Wang Laolao, Lu Weidong

Coal Geology & Exploration

Objective The formation and evolution of fractures in tectonically deformed coals (TDCs) exert a significant influence on the occurrence of dynamic hazards to TDC-bearding combinations under mining disturbance. However, the influence patterns remain unclear. Methods Using a NanoVoxel-3000 high-resolution inspection system for multiscale integrated geotechnical scanning and analysis, this study performed uniaxial compression and CT scanning experiments on TDC-bearing combination specimens. Moreover, this study reconstructed the mesoscopic geometric structures of the specimens using the Avizo software, obtaining three-dimensional visualization models of fractures inside the specimens. Results and Conclusions During loading of a specimen studied, fractures were generated in the TDC …

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