Wettability Evaluation Via Contact Angle And Data Mining For Enhanced Oil Recovery,
2026
Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Brunei, Bandar Seri Begawan, BE1410, Brunei Darussalam
Wettability Evaluation Via Contact Angle And Data Mining For Enhanced Oil Recovery, Syasya Wadihah Md. Ja’Afar, Bashir Busahmin
Journal of Sustainable Mining
The oil industry has used many enhanced oil recovery (EOR) strategies to increase crude oil production from reservoirs, particularly as production begins to fall. With a significant quantity of hydrocarbon reserves still existing in the reservoirs, improved oil recovery techniques have the potential to increase oil production, with wettability alteration playing a significant role. To date, there has been no comprehensive investigation of wettability in Brunei's sandstone reservoir. The goal of this research is to determine wettability by contact angle measurement and data mining approaches based on the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) algorithm. …
Owning Geothermal Energy,
2026
Texas A&M University School of Law
Owning Geothermal Energy, Gabriel Eckstein
Michigan Journal of Environmental & Administrative Law
Geothermal energy holds vast potential for decarbonizing the U.S. energy system, yet the sector remains significantly underdeveloped, supplying only 0.4% of the nation's electricity. A principal barrier to growth is the fragmented and ambiguous legal landscape currently governing ownership of geothermal resources: thirty-three states lack any clear statutory or common-law framework identifying who owns subsurface thermal energy. This Article examines the physical characteristics of geothermal energy, recent developments in the U.S. geothermal sector, and the principal doctrinal approaches that might govern ownership of subsurface heat, including the ad coelum doctrine, common-pool and open-access frameworks, the rule of capture, and public …
Recovery Of Bioenergy From Industrial Wastewater Using Microbial Fuel Cell,
2026
Department of Development Studies, HANDS-Institute of Development Studies, Karachi, Pakistan; Department of Energy and Environment Engineering, Dawood University of Engineering and Technology, Karachi, Pakistan
Recovery Of Bioenergy From Industrial Wastewater Using Microbial Fuel Cell, Syed Wamiq Ali, Ghulam Mujtaba, Manzoor Ahmed Sanjrani, Falak Shad
Journal of Bioresource Management
Water problems and Energy demands are increasing particularly in developing countries. Researchers are looking for sustainable technologies that can address increasing energy and environmental concerns. Major reasons behind those emerging concerns are industrialization and rapid development. There is need of sustainable technology which can solve wastewater issues and fulfill energy demand. One of the emerging technologies that have been studied comprehensively is Microbial Fuel Cell (MFC). It is a bio-electrochemical conversion technology that converts organic substrate into electrical energy. Chemical Oxygen Demand (COD) is removed as a result of microbial metabolism of organic substrate. Even through technical and economic aspects …
Positive And Negative Pressure Distributions And Gas Migration Mechanisms Under Gas Drainage From Coal Seams Using Ultra-Long Directional Boreholes,
2026
CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China
Positive And Negative Pressure Distributions And Gas Migration Mechanisms Under Gas Drainage From Coal Seams Using Ultra-Long Directional Boreholes, Li Quanxin, Zhao Yuechen, Mou Quanbin, Wang Liang, Fang Jun, Wang Chenghao
Coal Geology & Exploration
Background Gas drainage via ultra-long directional boreholes plays a significant role in gas control in coal mines. To ensure safe and efficient gas drainage using these boreholes, it is critical to determine the mechanisms behind positive- negative pressure coupling, as well as the dominant mechanisms governing gas migration. However, the evolutionary patterns of positive-negative pressure zoning within the boreholes and the primary factors influencing gas drainage efficiency have yet to be accurately characterized. Methods Under the engineering background of the Shendong Baode Coal Mine, this study developed a multi-field coupling model integrating diffusion, seepage, and in-borehole flow fields based on …
Spatiotemporal Variations And Their Influencing Factors For Vegetation Net Primary Productivity In The Shendong Coal Base,
2026
State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology (Beijing), Beijing 100083, China; College of Geoscience and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; Xinjiang Institute of Engineering, Urumqi 830023, China
Spatiotemporal Variations And Their Influencing Factors For Vegetation Net Primary Productivity In The Shendong Coal Base, Yang Fei, Cui Kuankuan, Zhang Chengye, Li Jun, Dong Qiulin
Coal Geology & Exploration
Objective The Shendong coal base, located within the arid and semi-arid regions in western China, is identified as the region with the most pronounced contradiction between coal resource development and ecological conservation in the country. Analyzing the spatiotemporal variations in the ecosystem and their influencing factors at the base scale provides a necessary foundation for green mine construction while also offering critical support for regional sustainable development.Methods In this study, the vegetation net primary productivity (NPP) was selected as an indicator for the ecological evaluation of mining areas. By integrating data on terrain, weather and climate, socio-economy, and human …
Application Of A Generative Adversarial Network To Super-Resolution Reconstruction Of Fracture Images In Logging-While-Drilling Electrical Resistivity Imaging,
2026
No.9 Oil Production Plant, Changqing Oilfield Company, PetroChina, Yinchuan 750005, China
Application Of A Generative Adversarial Network To Super-Resolution Reconstruction Of Fracture Images In Logging-While-Drilling Electrical Resistivity Imaging, Han Sen, Shen Chuanhai, Xu Chen, Tian Yimeng, Zhao Biao, Wang Ze, Liu Yongkang, Kang Zhengming
Coal Geology & Exploration
Objective Logging-while-drilling electrical resistivity imaging (LWD-ERI) enables the intuitive presentation of geobodies near wellbores in images, representing an important approach to the fine-scale evaluation of stratigraphic parameters while also providing significant geological guidance during the drilling of fractured reservoirs. However, this technique faces the challenge of low image resolution in real-time data processing due to its limited well-to-surface data transmission rates, exerting adverse impacts on the qualitative identification of wellbore fractures and the quantitative evaluation of their parameters. To address this issue, this study proposed a super-resolution image reconstruction method based on a generative adversarial network (GAN), aiming to achieve …
A Method For Fine-Scale Identification Of Collapse Columns Based On Offset Vector Tile Domain Seismic Data,
2026
CCTEG Xi’an Research Institute (Group) Co. Ltd., Xi’an 710077, China
A Method For Fine-Scale Identification Of Collapse Columns Based On Offset Vector Tile Domain Seismic Data, Zhang Guangzhong, Liu Song, Shan Rui, Cai Wenrui
Coal Geology & Exploration
Objectives and Methods The YQ mining area in the Qinshui Basin is characterized by complex seismic and geological conditions, as well as well-developed collapse columns and flexure structures. Consequently, conventional three-dimensional (3D) seismic exploration fails to meet the precision requirements for safe coal mining. By constructing a physical model based on the actual geological conditions of the study area, this study conducted forward modeling for the seismic responses of collapse columns under varying azimuths. Accordingly, the azimuthal anisotropy of the collapse columns were systematically analyzed. By employing a regular noise suppression technique based on curvelet transform, combined with prestack migration …
Table Of Contents,
2026
China Coal Technology and Engineering Group (CCTEG)
Biogasification Potential Of Medium- To High-Rank Coals And Its Controlling Mechanisms At A Molecular Structural Level,
2026
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China; Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an 710054, China
Biogasification Potential Of Medium- To High-Rank Coals And Its Controlling Mechanisms At A Molecular Structural Level, Bao Yuan, Li Jiajun, Li Dan, Chen Xueru, Wang Xiaojing
Coal Geology & Exploration
Objective Coals with varying metamorphic grades differ significantly in the potential for methane generation through microbial degradation. Medium- to high-rank coals can generate a substantial volume of methane through microbial degradation. However, key factors governing their biogasification potential remain poorly understood. This study aims to identify the dominant factors controlling the potential of medium- to high-rank coals for methane generation through microbial degradation, as well as relevant controlling mechanisms, from the perspective of molecular structures.Methods The Carboniferous-Permian medium- to high-rank coals along the eastern margin of the Ordos Basin were investigated in this study. Using experiments on the hydrocarbon …
Characteristics And Helium Generation Potential Of Ultra-Deep Marine Shales As Helium Source Rocks,
2026
State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China; College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
Characteristics And Helium Generation Potential Of Ultra-Deep Marine Shales As Helium Source Rocks, Yuan Jiutao, Zhang Wenjin, Song Zezhang, Tian Xingwang, Luo Qingyong, Jin Shigui, Wang Shulong, Wu Meijia, Wang Li, Chen Hongbin, Gao Jiawei, Mikhail Spasennykh, Tagir Karamov
Coal Geology & Exploration
Objective Large-scale, effective helium source rocks serve as a material basis for the formation of a helium-rich gas field. In the Weiyuan area, Sichuan Basin, the helium-rich gas reservoirs within the Dengying Formation exhibit helium source rocks consisting of the pre-Sinian basement granites and the shales of the Cambrian Qiongzhusi Formation. Compared to the basement granites, studies on the shales of the Qiongzhusi Formation remain limited, including those on the occurrence characteristics of uranium (U)- and thorium (Th)-rich minerals and helium generation potential.Methods This study investigated the shales of the Qiongzhusi Formation, Weiyuan area, Sichuan Basin. By integrating field …
Mechanisms Behind The Controlling Effects Of Temperature-Pressure Conditions On The Dynamic Ch4–H2O Production From Bituminous Coal,
2026
Key Laboratory of Coalbed Methane Resources & Reservoir Formation Process, Ministry of Education, China University ofMining and Technology, Xuzhou 221008, China; School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Mechanisms Behind The Controlling Effects Of Temperature-Pressure Conditions On The Dynamic Ch4–H2O Production From Bituminous Coal, Zhang Hewei, Shen Jian, Li Kexin, Wu Caifang
Coal Geology & Exploration
Background For deep coalbed methane (CBM) exploitation, the temperature-pressure synergistic effect in the CH4-H2O two-phase flow remains poorly understood, restricting the establishment of efficient CBM production systems.Methods This study investigated the No.13 coal seam in the Guanjiaya Coal Mine along the eastern margin of the Ordos Basin. Using low-field nuclear magnetic resonance (LF-NMR) and nuclear magnetic resonance imaging (NMRI) techniques, this study explored the dynamic process of CH4 displacing water and associated gas-water production mechanisms under different displacement pressures (2‒8 MPa) and temperatures (25 ℃ and 60 ℃).Results and Conclusions The sample used …
Enrichment Patterns And Accumulation Models Of Coalbed Methane Under Complex Geological Conditions: A Case Study Of The Xintian Coal Mine In Western Guizhou Province, China,
2026
Key Laboratory of Coalbed Methane Resources & Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China; School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Enrichment Patterns And Accumulation Models Of Coalbed Methane Under Complex Geological Conditions: A Case Study Of The Xintian Coal Mine In Western Guizhou Province, China, Xu Shuai, Wu Caifang, Bie Xiaofei, Li Guangsheng, Fang Xiaojie, Wang Fangfang, Cheng Yi, Zhao Peng
Coal Geology & Exploration
Objective The Xintian Coal Mine, a critical coal-producing mine in western Guizhou Province, faces high risks of coal and gas outbursts and the challenge of low underground coalbed methane (CBM) extraction efficiency, necessitating surface CBM extraction. However, the complex geological conditions in the area limit well placement and the fracturing and gas drainage effectiveness. Therefore, there is an urgent need to systematically elucidate the occurrence characteristics and enrichment patterns of CBM in the area.Methods Based on data from exploration boreholes in the Xintian Coal Mine, combined with experiment and test results and log interpretations, this study revealed the physical …
Mechanisms Behind The Control Of Floor Failure In Deep Coal Mines By Hydraulic Fracturing Based On Power-Law Fracture Networks,
2026
School of Civil Engineering, Sun Yat-sen University, Zhuhai 519082, China; State Key Laboratory for Tunnel Engineering, Sun Yat-sen University, Guangzhou 510275, China
Mechanisms Behind The Control Of Floor Failure In Deep Coal Mines By Hydraulic Fracturing Based On Power-Law Fracture Networks, Duan Hongfei, Ye Dayu, Zhao Lijuan, Zeng Yifan, Zou Junpeng, Yu Guofeng, Meng Xiang
Coal Geology & Exploration
Objective Hydraulic fracturing of coal seam floors represents an important technical approach to mitigating damage to the floor rock masses through proactive pressure relief and to improving seepage pathways. However, there is a lack of systematic, quantitative insights into the evolutionary characteristics of floor fracture networks, as well as their impacts on the stress redistribution and rock stability of coal seam floors, during hydraulic fracturing.Methods This study aims to address the challenge that is prone to cause severe damage to the floor rock masses. First, a coal seam floor was considered a saturated porous medium containing multi-scale fractures based …
Comparison Of Models For Predicting The Floor Failure Depths Of Coal Seams With Moderate Thicknesses And Above Under Fully Mechanized Mining,
2026
Hebei State Key Laboratory of Mine Disaster Prevention, University of Emergency Management, Langfang 065201, China; CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China
Comparison Of Models For Predicting The Floor Failure Depths Of Coal Seams With Moderate Thicknesses And Above Under Fully Mechanized Mining, Xu Bin, Zhong Cen, Dong Shuning, Yin Shangxian, Wang Hao, Li Shuxia, Du Yongwei, Zhang Kebin
Coal Geology & Exploration
Objective The failure depth of a coal seam floor represents a critical parameter for assessing the risk of floor water inrushes. With the widespread application of fully mechanized mining with a large mining height, existing empirical equations suffer from insufficient accuracy when used to calculate the mining-induced floor failure depths of coal seams with moderate thicknesses and above.Methods Based on the compressive strength of coal seam floors (i.e., hard, moderately hard, and weak floors), 107 sets of data samples of the measured floor failure depths of coal seams with moderate thicknesses and above under fully mechanized mining were classified. …
Post-Grouting Subsidence Of The Overburden In Goaves At Major Engineering Sites: Fiber Optic Monitoring And Deformation Mechanisms,
2026
College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China; CCTEG Ecological Environment Technology Co., Ltd., Beijing 100013, China
Post-Grouting Subsidence Of The Overburden In Goaves At Major Engineering Sites: Fiber Optic Monitoring And Deformation Mechanisms, Cao Xiaoyi, Liu Xiaoping, Liu Haoqi
Coal Geology & Exploration
Background The characteristics and mechanisms of residual deformations in goaves after engineering reinforcement (i.e., grouting filling) concern the design, construction, and long-term safety of major engineering projects. Furthermore, they are identified as the key to the efficient development of abandoned land in goaves within old mining areas. Therefore, it is necessary to explore methods and techniques for monitoring post-grouting subsidence of the entire strata in goaves. This will help acquire high-quality, long-term monitoring data on deformation in the field and reveal the mechanisms behind deformation associated with post-grouting subsidence in goaves.Methods This study investigated the Xiaohegou Bridge site (including …
Discovery Of Quasi-Carbon Nanotube Structures In Tectonically Deformed Coals And Their Formation Mechanisms,
2026
School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454003, China; Henan Key Laboratory of Coal Measure Unconventional Resources Accumulation and Exploitation, Jiaozuo 454003, China
Discovery Of Quasi-Carbon Nanotube Structures In Tectonically Deformed Coals And Their Formation Mechanisms, Li Yunbo, Wang Rongqi, Song Dangyu, Wang Chengtao, Li Qiang, Yi Ke, Wang Yuanyuan, Pan Jienan
Coal Geology & Exploration
Objective Carbon nanotubes (CNTs) have attracted wide attention due to their unique structures and performance. However, their artificial synthesis requires stringent conditions, including high temperatures (700 ℃ to 2 300 ℃), stable carbon sources, and catalysts. Furthermore, these structures are rarely discovered in nature. As a carbon-rich medium, coals can form a variety of ordered carbon structures during their metamorphic and deformational processes, serving as an ideal carrier for exploring the formation mechanisms of natural CNTs.Methods Typical tectonically deformed coals from the Pingdingshan and Huaibei mining areas were investigated in this study. After demineralization and chloroform extraction, coal samples …
Dynamic Evolution Of Rock Mechanical Properties Of Coal Seam Roofs Under Thermal Loading: A Case Study Of The Baikouquan Area, Xinjiang, China,
2026
Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, Xinjiang University, Urumqi 830047, China
Dynamic Evolution Of Rock Mechanical Properties Of Coal Seam Roofs Under Thermal Loading: A Case Study Of The Baikouquan Area, Xinjiang, China, Sun Fangfang, Li Xin, Sang Shuxun, Qu Huailin, Yang Shuguang, Wei Bo, Wang Ziqiang, Zhang Bin, Chen Yanpeng, Tian Wenling
Coal Geology & Exploration
Objective Underground coal gasification (UCG) represents a key technology for the clean utilization of coal resources. However, during the UCG process, thermal damage to surrounding rocks under thermal effects directly affects the stability and engineering safety of gasification channels.Methods To address the thermal damage to surrounding rocks during UCG, this study investigated the silty mudstones and coarse-grained sandstones in the coal seam roof of the Xishanyao Formation, Baikouquan area, Xinjiang. Through high-temperature uniaxial compression experiments, combined with characterization methods like X-ray diffraction (XRD) and scanning electron microscopy (SEM), this study delved into the dynamic evolutionary patterns of rock mechanical …
Coupling Mechanisms Of Fracture Propagation And Proppant Transport Indeep Coalbed Methane Reservoirs,
2026
College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing 102249, China
Coupling Mechanisms Of Fracture Propagation And Proppant Transport Indeep Coalbed Methane Reservoirs, Guo Xiaodong, Zhang Shicheng, Zhang Jingchen, Zhou Changjing, Zhang Chengsheng, Qiu Shixin, Xi Xiangrui
Coal Geology & Exploration
Objectives and Methods Deep coalbed methane (CBM) reservoirs commonly exhibit well-developed beddings, strong mechanical heterogeneity, and high in-situ stress gradients. These characteristics result in pronounced nonlinear fracture propagation and strong multi-field coupling effects during hydraulic fracturing. Consequently, it is challenging to accurately describe the mechanisms governing fracture complexity in deep coal reservoirs using conventional mechanical models for fractures. Using a super-large true triaxial system with dimensions of 2.0 m × 2.0 m × 1.0 m, this study conducted physical simulation experiments on hydraulic fracturing under varying injection rates and viscosities of fracturing fluids. In combination with fracture mechanics and energy …
Advances In Research On Mechanisms And Prevention And Control Technologies For Solid-Phase Production In Hydraulically Fractured Coalbed Methane Wells,
2026
Natural Gas Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi’an 710061, China
Advances In Research On Mechanisms And Prevention And Control Technologies For Solid-Phase Production In Hydraulically Fractured Coalbed Methane Wells, Zhang Fengsan, Wu Jinqiao, Lin Jin, Li Yu, Zhang Ying, Li Bing, Zhang Guobiao, Sun Ying, Gan Yuke
Coal Geology & Exploration
Background The effective coalbed methane (CBM) exploitation using hydraulic fracturing wells is severely constrained by two major solid-phase production issues: coal fines blockage and proppant flowback. The mechanisms behind both issues are associated with complex interplays between geological conditions and engineering disturbances. This study presents a systematic review of the current status of domestic and international research on the mechanisms of the solid-phase production, as well as relevant prevention and control methods. Furthermore, future research directions are proposed.Advances The solid-phase production in hydraulically fractured CBM wells essentially arises from flow-solid-chemical multi-field coupling processes under interplays between geological conditions and …
Characteristics And Mechanisms Of The Adsorption Of Shales For Ba2+ In Fracturing Fluids,
2026
School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China; CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China
Characteristics And Mechanisms Of The Adsorption Of Shales For Ba2+ In Fracturing Fluids, Xie Chenyang, Liu Bo, Zhang Yuting, Zhu Fang
Coal Geology & Exploration
Objectives and Methods Large-scale hydraulic fracturing represents a key technology for shale gas exploitation. However, engineering practices indicate that the flowback rates of fracturing fluids are low and vary significantly across different blocks. Furthermore, some components in fracturing fluids may cause groundwater contamination. To explore the adsorption characteristics and mechanisms of Ba2+ within fracturing fluids in shale reservoirs, this study investigated four typical types of samples, including shale and three shale samples with different compositions, from the Longmaxi Formation in the Changning Block, southern Sichuan Basin. Systematic experiments were conducted on the adsorption of shales with different mineral …
