Microphysics Regimes Due To Haze–Cloud Interactions: Cloud Oscillation And Cloud Collapse,
2025
Brookhaven National Laboratory
Microphysics Regimes Due To Haze–Cloud Interactions: Cloud Oscillation And Cloud Collapse, Fan Yang, Hamed F. Sadi, Raymond Shaw, Fabian Hoffmann, Pei Hou, Aaron Wang, Mikhail Ovchinnikov
Michigan Tech Publications
It is known that aqueous haze particles can be activated into cloud droplets in a supersaturated environment. However, haze–cloud interactions have not been fully explored, partly because haze particles are not represented in most cloud-resolving models. Here, we conduct a series of large-eddy simulations (LESs) of a cloud in a convection chamber using a haze-capable Eulerian-based bin microphysics scheme to explore haze–cloud interactions over a wide range of aerosol injection rates. Results show that the cloud is in a slow microphysics regime at low aerosol injection rates, where the cloud responds slowly to an environmental change and droplet deactivation is …
Seepage Evolution Patterns And Self-Sealing Characterization Of Mining-Induced Overburden Fractures In Ecologically Vulnerable Mining Areas,
2025
School of Mining and Coal, Inner Mongolia University of Science & Technology, Baotou 014010, China; Inner Mongolia Key Laboratory of Mining Engineering, Baotou 014010, China; Inner Mongolia Research Center for Coal Safety Mining and Utilization Engineering and Technology, Baotou 014010, China; Inner Mongolia Cooperative Innovation Center for Coal Green Mining and Green Utilization, Baotou 014010, China
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 …
Table Of Contents,
2025
China Coal Technology and Engineering Group (CCTEG)
Geological Technological Innovations And Contributions In The Exploration And Development Of The Shenfu Coalfield,
2025
School of Mines, China University of Mining & Technology, Xuzhou 221116, China
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 …
Mining-Induced Fault Slip: Assessment Model And Method For Determining Fault Instability Ranges,
2025
School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; New Energy Development and Disaster Prevention Research Center, China University of Mining and Technology (Beijing), Beijing 100083, China
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, …
Geological Characteristics And Key Technologies For Exploration And Development Of The Yanchuannan Coalbed Methane Field, Ordos Basin,
2025
Key Laboratory of Deep CBM Exploration and Production, SINOPEC, Nanjing 210011, China; East China Oil & Gas Company, SINOPEC, Nanjing 210011, China
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 …
Exploring Sandstone-Hosted Uranium Deposits In Coal-Bearing Basins Using Geophysical Methods: A Case Study Of The East-Central Erlian Basin,
2025
Hohhot General Survey of Natural Resources Center, China Geological Survey, Hohhot 010090, China; Innovation Base for Gold Exploration Technology in the Northern Margin of North China Craton, Hohhot 010013, China
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. …
Impacts Of Diamond Particle Sizes On Performance Of Ni-Cu Superhydrophobic Coatings On Drilling Tool Surfaces,
2025
Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
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, …
Primary Geological Characteristics, Advances In Exploration And Production, And Strategies Of Coalbed Methane In South China,
2025
Key Laboratory of Deep Coalbed Methane Exploration and Development, SINOPEC, Nanjing 210011, China; East China Oil and Gas Company, SINOPEC, Nanjing 210011, China
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 …
Stratigraphic Characteristics And Shale Gas Enrichment Interval Distribution Of The Lower Cambrian Qiongzhusi Formation, Upper Yangtze Region, China,
2025
PetroChina National Institute of Excellence Engineers, Beijing 100096, China; National Energy Shale Gas Research and Development (Experimental) Center, Beijing 100083, China
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 …
Advances In Research On Technologies For Large-Scale Coal Gangue Utilization For Green Mine Construction,
2025
Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221116, China; State Key Laboratory of Coal Mine Disaster Prevention and Control, China University of Mining and Technology, Xuzhou 221116, China
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 …
Advances In Research On The Mechanical Responses Of Hot Dry Granites Under Varying Cooling Conditions In China,
2025
School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China; No. 112 Geological Team, Bureau of Geology and Mineral Exploration and Development of Guizhou Province, Anshun 561000, China
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 …
Engineering Practice Of Advance Gas Control For Crushed Soft Coal Seams Through Directional Fracturing Using A Long Borehole In The Coal Seam Roof,
2025
CCTEG Xi'an Research Institute (Group) Co., Ltd., Xi'an 710077, China; College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
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 …
Dynamic Evolutionary Pattern Of Fractures In Tectonically Deformed Coal-Bearing Assemblages During Loading,
2025
College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; Key Laboratory of Xinjiang Coal Resources Green Mining, Ministry of Education, Xinjiang Institute of Engineering, Urumqi 830023, China; Xinjiang Key Laboratory of Coal Mine Disaster Intelligent Prevention and Emergency Response, Xinjiang Institute of Engineering, Urumqi 830023, China
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 …
A New Quantitative Assessment Model For The Joint Roughness Of Rock Masses,
2025
School of Mining and Mechanical Engineering, Liupanshui Normal University, Liupanshui 553004, China; College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
A New Quantitative Assessment Model For The Joint Roughness Of Rock Masses, Chen Shijiang, Liu Hongwei, Li Tao, Yue Hu, Liu Jiangang, Yu Jiang
Coal Geology & Exploration
Objective The joint roughness of rock masses significantly affects their mechanical properties such as shear strength and permeability. Therefore, its quantitative characterization is significant for the engineering practices of jointed rock masses. Current research achievements indicate that among statistical parameters, the root mean square (RMS) of first derivatives (Z2) exhibits the strongest correlation with the joint roughness of rock masses, serving as a vital method for characterizing joint roughness. However, the characterization using this parameter is severely affected by the sampling interval (SI). Methods Based on a systematic analysis of the drawbacks of Z2 in characterizing …
Zonal Prediction Of The Heights Of Water-Conducting Fracture Zones Under Varying Overburden Types In North China-Type Coalfields,
2025
School of Earth Sciences and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Zonal Prediction Of The Heights Of Water-Conducting Fracture Zones Under Varying Overburden Types In North China-Type Coalfields, Xu Dongjing, Zhang Ruiqing, Gao Weifu, Jiang Haonan, Zhu Haifeng, Li Ye, Xia Zhicun
Coal Geology & Exploration
Background The gradual increase in the exploitation depth and intensity of coal resources in the North China-type coalfields has caused problems such as overburden movement and damage, as well as fracture evolution. These hot topics have attracted considerable attention. Methods A total of 117 sets of measured data on the heights of water-conducting fracture zones in the North China-type coalfields were collected, consisting of 17 sets from hard overburden, 42 sets from moderately hard overburden, and 58 sets from soft overburden. Using these data, this study explored the effects of varying mining heights, mining depths, and lengths of the mining …
A Method For Time Difference Correction For Real-Time Seismic-While-Mining Data,
2025
CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China
A Method For Time Difference Correction For Real-Time Seismic-While-Mining Data, Jin Dan
Coal Geology & Exploration
Objective Seismic-while-mining (SWM) data are usually acquired using multiple stations, each of which is equipped with multiple data acquisition traces. However, the SWM data received by these stations exhibit time differences due to the lack of GPS signals underground and the fact that current network synchronization technologies are confined by network delays underground. Given that the time synchronization accuracy directly affects the quality of data processing and imaging, the time difference correction of real-time SWM data is essential for accurate SWM detection. Methods Since current high-precision timing systems on the surface suffer from signal loss underground, this study proposed an …
Influencing Mechanisms Of Microwave Radiation Duration On The Efficiency Of Methane Adsorption In Coals,
2025
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
Influencing Mechanisms Of Microwave Radiation Duration On The Efficiency Of Methane Adsorption In Coals, Hu Yiliang, Bao Yuan, Meng Jiahao, Chen Xueru, Shan Tuo
Coal Geology & Exploration
Objective Microwave radiation duration represents a critical factor in enhancing coalbed methane (CBM) recovery using microwave-aided methods. However, the influencing mechanism of microwave radiation duration on the efficiency of methane adsorption in coal seams remains unclear. This necessitates delving into the specific effects of microwave radiation duration on the adsorption efficiency and unveiling their intrinsic constraints. Methods This study investigated the No.2 coal seam in the Huangling mining area. The coal samples were irradiated for 0‒18 min using 700 W microwaves. Using experiments and analyses including isothermal adsorption, low-temperature liquid N2 adsorption, and Fourier transform infrared spectroscopy (FTIR), this study …
Assessment Indicator System For Siting Of Geologic Co2 Sequestration In Low-Porosity And Low-Permeability Saline Aquifers: A Case Study Of The Ordos Basin,
2025
China National Logging Corporation, Xi’an 710077, China
Assessment Indicator System For Siting Of Geologic Co2 Sequestration In Low-Porosity And Low-Permeability Saline Aquifers: A Case Study Of The Ordos Basin, Mou Yu, Wang Haofan, Shaanxi Key Laboratory For Carbon Neutral Technology, Carbon Neutrality College (Yulin), Northwest University, Xi’An 710069, China Xuejun, Ma Jinfeng, Luo Shaocheng, Li Lin, Ding Zhao
Coal Geology & Exploration
Objective CO2 injection and geologic sequestration in deep saline aquifers as underground spatial resources represents an important means of achieving the targets of greenhouse gas emission reduction and carbon neutrality. Current assessments of the siting and potential for geologic CO2 sequestration in saline aquifers focus primarily on the macroscopic basin and regional scales, with the assessment indicator system scarcely accounting for the suitability of low-porosity and low-permeability strata. Methods Using data from 192 wells in the Yusheng area, Ordos Basin, this study conducted the division and correlation of intervals bearing no hydrocarbon, carried out lithologic and physical interpretations …
Optimization And Application Of Sand Bailing Technology For Coalbed Methane Horizontal Wells,
2025
China United Coalbed Methane Co., Ltd., Beijing 100015, China; Provincial Center of Technology Innovation for Coal Measure Gas Co-Production, Taiyuan 030032, China
Optimization And Application Of Sand Bailing Technology For Coalbed Methane Horizontal Wells, Zhang Fei, Wang Yibing, Cheng Lu, Mei Wenbo, Yang Qi, Shen Wenjie, Cao Chao, Lai Peng, Liao Zhengkai, Xian Bao'an, Bi Yansen
Coal Geology & Exploration
Objective and Methods Coalbed methane (CBM) horizontal wells face challenges such as sand accumulation in completion strings, pipe wall scaling, and pump sticking, leading to declined CBM production or shutdown of these wells. This severely restricts continuous, stable CBM production. Removing pulverized coals and sands from wellbores through mechanical sand bailing is recognized as an effective technique to restore and improve the CBM production of horizontal wells. To address challenges such as poor string sealing performance, low efficiency, and sand consolidation in mechanical sand bailing, this study created optimized tools including claw-shaped scraper tips, sand-breaking drill bits, eccentric flaps, and …
