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Geochemical characteristics,generation,and evolution mechanism of coalbed methane in the south-western Ordos Basin,China

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Frontiers of Earth Science 2024年第2期18卷 296-311页

作者： Yabing LIN Yong QIN Dongmin MA Shengquan WANG College of Geology and Environment Xi’an University of Science and TechnologyXi’an 710054China key laboratory of Coalbed Methane Resource and reservoir formation process(the ministry of education) China University of Mining and TechnologyXuzhou 221008China Shaanxi Provincial key laboratory of Geological Support for Coal Green Exploitation Xi’an 710054China

The south-western Ordos Basin is rich in low-middle rank coalbed methane(cbm)resources;while the geochemical characteristics and genetic mechanism of cbm are not ***,according to geological and geochemical test data from gas and coal seam water from cbm wells in Bingchang,Jiaoxun,Huangling,Yonglong,and Longdong minging areas,we systematically studied the geochemical characteristics,generation,and evolution mechanism of cbm in Jurassic Yan’an formation in the south-western Ordos *** results show that the CH4 content of whole gas is in the range of 42.01%-94.72%.The distribution ranges of theδ^(13)C-CH_(4)value is−87.2‰to−32.5‰,indicating diverse sources of thermogenic gas and biogenic *** microbial methane is mainly generated by a CO_(2)reduction pathway,with certain methyl-type fermentation ***δ^(13)C-CH_(4)has a positive correlation with burial depth,indicating the obvious fractionation of *** relationship between the genetic types and burial depth of the cbm reservoir indicates that the favorable depth of secondary biogenic gas is less than 660 *** Late Cretaceous Yanshanian Movement led to the uplift of the Ordos Basin,and a large amount of thermogenic gas escaped from the edge of the *** the Paleogene Period,the coal reservoir in the basin margin has received recharge from atmospheric precipitation,which is favorable for the formation of secondary biogenic *** deep area,generally under 1000 m,mainly contains residual thermogenic *** intermediate transition zone is mixed *** by the tectonic background,the genetic types of cbm in different mining areas are controlled by the coupling of burial depth,coal rank,and hydrogeological *** Binchang mining area contains biogenic gas,and the development of cbm has achieved initial success,indicating that similar blocks with biogenic gas formation conditions is key to the efficient development of *** research results provide a scientific basis for

关键词： coalbed methane stable isotopes geochemistry generation and evolution mechanism Ordos Basin

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Geological modeling of coalbed methane reservoirs in the tectonically deformed coal seam group in the Dahebian block,western Guizhou,China

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Frontiers of Earth Science 2024年第1期18卷 44-67页

作者： Yong SHU Shuxun SANG Xiaozhi ZHOU key laboratory of Coalbed Methane resources and reservoir formation process(ministry of education) China University of Mining and TechnologyXuzhou 221116China Carbon Neutrality Institute China University of Mining and TechnologyXuzhou 221008China School of resources and Geosciences China University of Mining and TechnologyXuzhou 221116China Jiangsu key laboratory of Coal-based Greenhouse Gas Control and Utilization China University of Mining and TechnologyXuzhou 221008China

The widely spread Carboniferous-Permian coal seam group in southern China has great potential for coalbed methane resources,but the extensively developed tectonically deformed coal seriously restricts its *** the Dahebian block in western Guizhou as the study area,the geological model of coalbed methane reservoirs in the tectonically deformed coal seam group was established,and the spatial distribution pattern of model parameters was clarified by clustering algorithms and factor *** facies model suggests that the main coal body structures in Nos.1,4,and 7 coal seams are cataclastic coal and granulated coal,whereas the No.11 coal seam is dominated by granulated coal,which has larger thicknesses and spreads more *** in situ permeability of primary undeformed coal,cataclastic coal,granulated coal,and mylonitized coal reservoirs are 0.333 mD,0.931 mD,0.146 mD,and 0.099 mD,respectively,according to the production performance analysis *** property model constructed by facies-controlled modeling reveals that Nos.1,4,and 7 coal seams have a wider high-permeability area,but the gas content is lower;the high-permeability area in the No.11 coal seam is more limited,but the gas content is *** results of the self-organizing map neural network and K-means clustering indicate that the geological model can be divided into 6 clusters,the model parameter characteristics of the 6 clusters are summarized by data analysis in combination with 6 factors extracted by factor analysis,and the application of data analysis results in multi-layer coalbed methane co-development is *** study provides ideas for the geological modeling in the tectonically deformed coal seam group and its data analysis.

关键词： geological modeling tectonically deformed coal coal seam group clustering algorithm Dahebian block,western Guizhou

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Excess pore pressure behavior and evolution in deep coalbed methane reservoirs

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International Journal of Mining Science and Technology 2024年第6期34卷 763-781页

作者： Changqing Liu Zhaobiao Yang Yong Qin Xia Yan Yunhai Wang Zhe Wang key laboratory of Coalbed Methane resources and reservoir formation process Ministry of EducationChina University of Mining and TechnologyXuzhou 221008China School of resources and Geosciences China University of Mining and TechnologyXuzhou 221116China National Engineering Research Center of Coalbed Methane Development&Utilization Beijing 100095China PetroChina Coalbed Methane Company Limited Beijing 102200China SINOPEC East China Oil and Gas Company Nanjing 210000China

Deep coalbed methane(Dcbm),an unconventional gas reservoir,has undergone significant advancements in recent years,sparking a growing interest in assessing pore pressure dynamics within these *** some production data analysis techniques have been adapted from conventional oil and gas wells,there remains a gap in the understanding of pore pressure generation and evolution,particularly in wells subjected to large-scale hydraulic *** address this gap,a novel technique called excess pore pressure analysis(EPPA)has been introduced to the coal seam gas industry for the first time to our knowledge,which employs dual-phase flow principles based on consolidation *** technique focuses on the generation and dissipation for excess pore-water pressure(EPWP)and excess pore-gas pressure(EPGP)in stimulated deep coal *** have been developed respectively and numerical solutions have been provided using the finite element method(FEM).Application of this model to a representative field example reveals that excess pore pressure arises from rapid loading,with overburden weight transferred under undrained condition due to intense hydraulic fracturing,which significantly redistributes the weight-bearing role from the solid coal structure to the injected fluid and liberated gas within artificial pores over a brief ***,field application indicates that the dissipation of EPWP and EPGP can be actually considered as the process of well production,where methane and water are extracted from deep coalbed methane wells,leading to consolidation for the artificial ***,history matching results demonstrate that the excess-pressure model established in this study provides a better explanation for the declining trends observed in both gas and water production curves,compared to conventional practices in coalbed methane reservoir engineering and petroleum *** research not only enhances the understanding of Dcbm re

关键词： Deep coalbed methane Consolidation Excess pore-water pressure Excess pore-gas pressure Production data analysis

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Physiochemical and biological characteristics of fouling on landfill leachate treatment systems surface

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Journal of Environmental Sciences 2024年第1期135卷 59-71页

作者： Zhourui Gong Shu Yang Rui Zhang Yangqing Wang Xiaoqing Wu Liyan Song School of resources and environmental engineering Anhui UniversityHefei 230601China Anhui Shengjin Lake Wetland Ecology National Long-term Scientific Research Base Dongzhi 247230China key laboratory of Three Gorges reservoir Region’s Eco-Environment Ministry of EducationChongqing UniversityChongqing 400045China Chongqing Institute of Green and Intelligent Technology Chinese Academy of SciencesChongqing 400714China Xing Lu Huan Jing Co.LTD. Luzhou 646000China

Fouling of landfill leachate,a biofilm formation process on the surface of the collection system,migration pipeline and treatment system causes low efficiency of leachate transportation and treatment and increases cost for maintenance of those *** addition,landfill leachate fouling might accumulate pathogens and antibiotic resistance genes(ARGs),posing threats to the *** of the landfill leachate fouling and its associated environmental behavior is essential for the management of *** this study,physicochemical and biological properties of landfill leachate fouling and the possible accumulation capacity of pathogens and ARGs were investigated in nitrification(aerobic condition)and denitrification(anaerobic condition)process during landfill leachate biological treatment,*** show that microbial(bacterial,archaeal,eukaryotic,and viral)community structure and function(carbon fixation,methanogenesis,nitrification and denitrification)differed in fouling under aerobic and anaerobic conditions,driven by the supplemental leachate water *** fouling had a higher abundance of nitrification and denitrification functional genes,while anaerobic fouling harbored a higher abundance of carbon fixation and methanogenesis *** forms of leachate fouling had a higher abundance of pathogens and ARGs than the associated leachate,suggesting the accumulation capacity of fouling on biotic ***,aerobic fouling harbored three orders of magnitude higher multidrug resistance genes mex D than its associated *** finding provides fundamental knowledge on the biological properties of leachate fouling and suggests that leachate fouling might harbor significant pathogens and ARGs.

关键词： Landfill leachate fouling Biofilm Microbiome Carbon and nitrogen cycle Pathogens Antibiotic resistance genes

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Cobalt-loaded carbon nanotubes boosted aerobic ciprofloxacin transformation driven by sulfide:A comprehensive mechanism investigation

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Chinese Chemical Letters 2024年第3期35卷 127-134页

作者： Han-Qing Zhao Peili Lu Fei Chen Chen-Xuan Li Rui Yan Yang Mu State key laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China CAS key laboratory of Urban Pollutant Conversion Department of Environmental Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China key laboratory of the Three Gorges reservoir Region's Eco-Environment College of Environment and EcologyChongqing UniversityChongqing 400045China College of resources and Environmental Engineering Hefei University of TechnologyHefei 230009China

Sulfide oxidation under aerobic conditions can produce active oxygen for the transformation of organic pollutants in aquatic ***,the catalytic performance of transition metal-supported carbon material on this process is poor *** study found that Co-loaded carbon nanotubes(CNTs)was able to realize the efficient aerobic transformation of antibiotic ciprofloxacin(CIP)by sulfide,with the pseudo-first order reaction rate constant improved from 0.013 h^(-1)without catalyst to 0.44–0.71 h^(-1)with 100 mg/L Co-loaded *** oxygen(^(1)O_(2))was the main active specie playing key roles in the process of CIP aerobic transformation with presence of Co-loaded *** studies indicated that the excellent electron transfer ability of Co-loaded CNTs might play an important role to promote the electron transfer and facilitate the formation of intermediate H_(2)O_(2)and^(1)O_(2).Additionally,the Co-loaded CNTs/sulfide system effectively reduced the acute toxicity of organic pollutant,and Co-loaded CNTs showed remarkable cycling stability and negligible *** study gives a better understanding for the Co-loaded CNTs mediated aerobic antibiotics transformation by sulfide,and provide a reference for the application of Co-loaded carbon materials on organics aerobic transformation by sulfide.

关键词： Ciprofloxacin Aerobic transformation Co-loaded carbon nanotubes Sulfide Singlet oxygen

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Discovery of the largest natural carbon onions on Earth

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Science China Earth Sciences 2022年第9期65卷 1736-1750页

作者： Yilin CHEN Yong QIN Jiuqing LI Zhuangfu LI Tianyu YANG Ergang LIAN key laboratory of Coalbed Methane resources and reservoir formation process of the ministry of education China University of Mining and TechnologyXuzhou 221008China School of resources and Geosciences China University of Mining and TechnologyXuzhou 221116China State key laboratory of Marine Geology Tongji UniversityShanghai 200092China

The synthesis of carbon onions in the laboratory by various methods is common;however, naturally occurring carbon onions have only been found in a few geological samples on Earth. This study used high-resolution transmission electron microscopy to identify natural carbon onions in seven intrusion-affected coal samples collected from Permian coal-bearing strata in the Yongan Coalfield, Fujian Province, South China. This study identified the largest natural carbon onions ever recorded on Earth;their outer diameter was ~55 nm. Granite porphyry intrusions and quartz hydrothermal veins are abundant in the Permian coal-bearing strata in this coalfield. All samples collected were tectonically deformed coals with highly developed structural fractures, friction mirror planes, and maximum vitrinite reflectance values of 4.0–9.5%. Natural carbon onions observed in the coal samples had single or multiple cores, with 24–46 graphitic shells characterized by outer diameters of 24–55 nm. The maximum vitrinite reflectance, outer diameter, and graphitic shell number of carbon onions in the intrusion-affected coal were positively correlated, indicating that the carbon onions were secondary products formed during coal metamorphism owing to magmatic intrusion. Our results suggest that carbon onions in intrusion-affected coal are synthesized by chemical vapor deposition. We speculate that natural carbon onions exist mainly in fractures or cavities, similar to vapor-deposited pyrolytic carbon, which is the leading cause of the uneven distribution of carbon onions in intrusion-affected coals in the study area.

关键词： Onion-like fullerenes Intrusion-affected coal Chemical vapor deposition HRTEM Coal metamorphism

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Experimental and numerical study of coal mechanical properties during coalification jumps

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Frontiers of Earth Science 2023年第1期17卷 45-57页

作者： Qiang HUANG Xuehai FU Jian SHEN Qiangling YAO Ming CHENG key laboratory of Coalbed Methane resources&reservoir formation process(ministry of education) China University of Mining and TechnologyXuzhou 221116China School of Mines Key Laboratory of Deep Coal Resource MiningMinistry of EducationChina University of Mining&TechnologyXuzhou 221116China

The mechanical characteristics of coal reservoirs are important parameters in the hydraulic fracturing of *** this study,coal samples of different ranks were collected from 12 coal mines located in Xinjiang and Shanxi,*** coal ranks were identified with by the increased Maximum vitrine reflectance(Ro,max)*** triaxial compression experiments were performed to determine the confining pressure effect on the mechanical properties of coal samples of different *** numerical approaches,including the power function,arctangent,and exponential function models,were used to find the correlation between coal elastic modulus and the confining *** fitting equations of compressive strength and elastic modulus of coal ranks were constructed under different confining *** results showed that the coal compressive strength of different ranks has a positive linear correlation with the confining *** coal elastic modulus and confining pressure showed an exponential ***’s ratio of coal and confining pressure show negative logarithmic *** stress sensitivity of the coal elastic modulus decreases with the increase of confining *** coalification jump identifies that the compressive strength,elastic modulus,and stress sensitivity coefficient of coal have a polynomial relationship with the increase of coal *** inflection points in coalification at Ro,max=0.70%,1.30%,and 2.40%,are the first,second,and third coalification *** findings provide significant support to coal fracturing during cbm production.

关键词： compressive strength elastic modulus confining pressure Poisson’s ratio coalification jump

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Acoustic response characteristics and sensitivity of briquette and raw coal under temperature and pressure control

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Frontiers of Earth Science 2023年第1期17卷 170-179页

作者： Hewei ZHANG Jian SHEN Kexin LI Xiaojie FANG Ziwei WANG Lei DU key laboratory of Coalbed Methane resources and reservoir formation process(ministry of education) China University of Mining and TechnologyXuzhou 221008China School of resources and Geosciences China University of Mining and TechnologyXuzhou 221116China Huabei Oilfield cbm Branch Company Changzhi 046000China Shaanxi Coalfield Geophysical Exploration and Mapping Co. Ltd.Xi᾽an 710000China

Acoustic testing is a widely used technique to measure the coal mechanical properties under high temperature and pressure in situ *** study compared the acoustic wave characteristics of briquette and raw coal under various temperature and pressure *** results show that the longitudinal wave velocity(Vp)decreases with an increasing vitrinite content.A large number of the vitrinite content enhances the process in which the temperature and pressure changed the *** Vp of briquette decreases approximately linearly with the temperature compared to raw *** Vp of raw coal experiences initially a rapid,then gradual,and finally the moderate increasing trend with the increase in confining ***,in briquette,the Vp increases approximately linearly with the confining *** results indicate that the Vp is more sensitive to temperature under low confining pressure and peaks at 50℃−60℃ than high confining ***,the Vp is less sensitive to temperature under higher confining pressure,and the positive effect of high confining pressure is *** the mechanical properties of coal under high pressure and temperature develops better insight into coalbed methane(cbm)exploration from deep reservoirs.

关键词： high-rank coal P-wave velocity temperature pressure microscopic components sensitivity

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Geochemistry of rare earth elements and yttrium in Late Permian coals from the Zhongliangshan coalfield, southwestern China

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Frontiers of Earth Science 2023年第1期17卷 230-250页

作者： Qingfeng LU Shenjun QIN Hongyang BAI Wenfeng WANG De’e QI Xin HE Bofei ZHANG School of resources and Geosciences China University of Mining&TechnologyXuzhou 221116China key laboratory for Resource Exploration Research of Hebei Province Hebei University of EngineeringHandan 056038China key laboratory of Coalbed Methane resources&reservoir formation process Ministry of EducationChina University of Mining&TechnologyXuzhou 221008China

Rare earth elements and yttrium(REY)in coal deposits are considered promising alternative sources for these resources owing to their increasing global *** paper reports the geochemical characteristics of REY in the Late Permian coals from an underground K1a seam section of the Zhongliangshan coalfield in Chongqing,southwestern *** mineralogy,degree of enrichment,distribution patterns,modes of occurrence,and sediment origin of REY were *** with the average of world coals,the concentration of REY in the K1a coals were normal,dominated by light REY(LREY),with less medium and heavy REY(MREY,HREY).The fractionation degree of the MREY and HREY are higher than that of LREY in most K1a coal samples,deduced from the mixed enrichment type of REY,mainly including M-H-type,and a few L-M type and *** addition,the combination of anomalies of Ce,Eu,Gd,and Al_(2)O_(3)/TiO_(2) parameters,the terrigenous materials in the K1a coal were derived from the felsic-intermediate rocks at the top of the Emeishan basalt sequence,and the samples were affected by seawater intrusion during early peat *** the minerals primarily consist of kaolinite,illite,pyrite,and small amounts of quartz,calcite and anatase,REY are correlated with ash yield,SiO2,and Al_(2)O_(3),revealing that the REY mainly occur in aluminosilicate minerals,especially kaolinite and ***,REY positively relate to P_(2)O_(5) and Zr,which may exist in phosphate-containing minerals or ***,most samples in the K1a coal or ash do not reach the cut-off grade for the beneficial recovery of *** the exception of central Guizhou,southwestern Chongqing,and the junction of western Guizhou and northeastern Yunnan,the REY content in coals from southwestern China are high,and its by-products are suitable as potential REY sources.

关键词： rare earth elements and yttrium Zhongliangshan K1a coal sediment source modes of occurrence geochemical characteristics

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Study on fracture characteristics in coal and shale for coal-measure gas reservoir based on 3D CT reconstruction and fractal features

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Frontiers of Earth Science 2023年第2期17卷 514-526页

作者： Huijun WANG Shangbin CHEN Shaojie ZHANG Chengxing ZHANG Yang WANG Gaofeng YI Yixuan PENG School of resources and Geoscience China University of Mining and TechnologyXuzhou 221116China key laboratory of Coalbed Methane resources and reservoir formation process(the ministry of education) China University of Mining and TechnologyXuzhou 221116China School of Earth Sciences and Engineering Sun Yat-sen UniversityGuangzhou 510275China

Pores and fractures are important components of flow channels in coal-measure gas *** considerable studies have been conducted on pore structure evolution,very few studies have investigated the fracture distribution and self-similarity *** reveal the characteristics of fracture distribution in coal and shale reservoirs,computed tomography studies were performed on 15 coal and shale samples from the Shanxi and Taiyuan *** results show that the fracture distribution of samples of the same lithology differs significantly,and the fracture distribution heterogeneity of shale samples is much higher than that of coal *** shale,the heterogeneity of fracture distribution is mainly caused by pores and fractures smaller than 2μm in the z-direction,with relatively little contributions from pores and fractures in the x and y ***,the heterogeneity of fracture distribution in coal is mainly controlled by pores and fractures larger than 2μm in all directions,and the difference between the three directions is *** was shown that a great number of microscopic pores and fractures contribute to the highest fractions of porosity in different lithological *** method is useful for determining the fracture distribution characteristics in shale and coal-measure gas reservoir.

关键词： pore-fracture system fracture distribution directionality heterogeneity CT experiment coalmeasure gas reservoirs

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