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Experimental investigation on coal pore-fracture variation and fractal characteristics synergistically affected by solvents for improving clean gas extraction

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International Journal of mining Science and technology 2024年第3期34卷 413-425页

作者： Feilin Han Sheng Xue Chunshan Zheng Zhongwei Chen Guofu Li Bingyou Jiang Key Laboratory of Safe and Effective coal mining of Ministry of Education Anhui University of Science and TechnologyHuainan 232001China School of Safety Science and Engineering Anhui University of Science and TechnologyHuainan 232001China School of Mechanical and mining Engineering University of QueenslandQLD 4072Australia State Key Laboratory of coal and coalbed methane co.mining Jincheng 048012China

Chemical solvents instead of pure water being as hydraulic fracturing fluid co.ld effectively increase permeability and improve clean methane extraction ***,pore-fracture variation features of lean coal synergistically affected by solvents have not been fully *** testing,nuclear magnetic resonance analysis,liquid phase mass spectrometry was adopted to co.prehensively analyze pore-fracture change characteristics of lean coal treated by co.bined solvent(NMP and CS_(2)).Meanwhile,quantitative characterization of above changing properties was co.ducted using geometric fractal *** model between permeability,fractal dimension and porosity were *** indicate that the end face fractures of coal are well developed after CS2and co.bined solvent treatments,of which,end face box-co.nting fractal dimensions range from 1.1227 to *** decreases in ultrasonic longitudinal wave velocity of coal affected by NMP,CS_(2)and co.bined solvent are 2.700%,20.521%,22.454%,*** treatments co.ld lead to increasing amount of both mesopores and *** ratio of fractal dimension Dsis 0.259%–2.159%,while permeability increases ratio of NMR ranges from 0.1904 to ***,co.bined solvent co.ld dissolve coal polar and non-polar small molecules and expand flow *** co.ld provide reference for solvent selection and parameter optimization of permeability-enhancement technology.

关键词： Clean gas extraction Chemical solvent Experimental investigation Fractal characteristics Pore fracture

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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 co.trol 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,acco.ding to the production performance analysis *** property model co.structed by facies-co.trolled modeling reveals that Nos.1,4,and 7 coal seams have a wider high-permeability area,but the gas co.tent is lower;the high-permeability area in the No.11 coal seam is more limited,but the gas co.tent 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 co.bination 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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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 co.lege 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 ***,acco.ding 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 co.tent 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 co.relation 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 seco.dary 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 seco.dary biogenic *** deep area,generally under 1000 m,mainly co.tains residual thermogenic *** intermediate transition zone is mixed *** by the tectonic background,the genetic types of CBM in different mining areas are co.trolled by the co.pling of burial depth,coal rank,and hydrogeological *** Binchang mining area co.tains biogenic gas,and the development of CBM has achieved initial success,indicating that similar blocks with biogenic gas formation co.ditions 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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Graded and Quantitative technology and Application of coal-Bearing Reservoir Based on Seismic Reflection Characteristics

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Journal of Geoscience and Environment Protection 2024年第6期12卷 279-290页

作者： Hao Zhang Huan Wan Liming Lin Wenjun Xing Tiemei Yang Longgang Zhou Lijun Gao Guangchao Zhi Xin Liu Xiaowen Song CNOOC EnerTech-Drilling & Production co. Tianjin China China United coalbed methane co. Ltd. Beijing China

Taiyuan formation is the main exploration strata in Ordos Basin, and coals are widely developed. Due to the interference of strong reflection of coals, we cannot co.pletely identify the effective reservoir information of coal-bearing reservoir on seismic data. Previous researchers have studied the reservoir by stripping or weakening the strong reflection, but it is difficult to determine the effectiveness of the remaining reflection seismic data. In this paper, through the establishment of 2D forward model of coal-bearing strata, the co.responding geophysical characteristics of different reflection types of coal-bearing strata are analyzed, and then the favorable sedimentary facies zones for reservoir development are predicted. On this basis, co.bined with seismic properties, the coal-bearing reservoir is quantitatively characterized by seismic inversion. The above research shows that the Taiyuan formation in LS block of Ordos Basin is affected by coals and forms three or two peaks in different locations. The reservoir plane sedimentary facies zone is effectively characterized by seismic reflection structure. Based on the characteristics of sedimentary facies belt and petrophysical analysis, the reservoir is semi quantitatively characterized by attribute analysis and waveform indication, and quantitatively characterized by pre stack geostatistical inversion. Based on the forward analysis of coal measure strata, this technology characterizes the reservoir facies belt through seismic reflection characteristics, and describes coal measure reservoirs step by step. It effectively guides the exploration of LS block in Ordos Basin, and has achieved good practical application effect.

关键词： coal-Bearing Reservoir Seismic Reflection Characteristics Waveform Indication Inversion Geostatistics Inversion

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High-strength and self-degradable sodium alginate/polyacrylamide preformed particle gels for co.formance co.trol to enhance oil reco.ery

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Petroleum Science 2022年第6期19卷 3149-3158页

作者： Xiao Zhang Jia-Nan Deng Kai Yang Qian Li Sen-Yao Meng Xiu-Xia Sun Zhao-Zheng Song Yong-Dong Tian Sui-An Zhang Xin-Jia Liu Zhan-yi Wang Xin-Yu Liu Gui-Wu Lu Zi-Long Liu coalbed methane Research Center Beijing Key Laboratory of Optical Detection Technology for Oil and GasCollege of ScienceChina University of Petroleum-BeijingBeijing102249China Shanxi lanyan coalbed methane Group co. LtdJinchengShanxi048012China State Key Laboratory of coal and CBM co.mining in Nancun Town JinchengShanxi048012China Institute of Oil and Gas technology Research Changqing OilfieldCNPCXi’anShaanxi710021China

Excess water production has beco.e an important issue in the oil and gas extraction *** particle gels(PPGs),show the capability to co.trol the co.formance and reduce excess water ***,co.ventional PPGs have poor mechanical properties and their swollen particles are easily damaged by shearing force when passing through the fractures in formations,meanwhile PPGs can be also degraded into various byproducts,leading to permanent damage to the reservoir permeability after temporary ***,a novel type of dual cross-linked PPGs(dPPGs)was designed and synthesized using sodium alginate(SA)and acrylamide(AAm),cross-linked with N,N’-methylenebisacrylamide(MBA)and Fe^(3+).Results show that dPPGs have excellent mechanical properties with a storage modulus up to 86,445 Pa,which is almost 20 times higher than other reported ***,dPPGs can be co.pletely degraded into liquid without any solid residues or byproducts and the visco.ity of dPPGs degraded liquid was found to be lower than 5 mPa·s.A laboratory co.eflooding test showed that the plugging efficiency of dPPGs was up to 99.83%on open *** obtained results demonstrated that dPPGs co.ld be used as eco.omical and environment-friendly temporary plugging agent with high-strength,self-degradation,thermal stability,and salt stability,thus making it applicable to a wide range of co.formance co.trol to enhance oil reco.ery.

关键词： co.formance co.trol Sodium alginate Dual cross-linked Temporary plugging agent High-strength Self-degradation

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Geochemistry of Mercury in the Permian Tectonically Deformed coals from Peigou Mine, Xinmi coalfield, China

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Acta Geologica Sinica(English Edition) 2017年第6期91卷 2243-2254页

作者： SONG Dangyu LI Chunhui SONG Boyi YANG Cunbei LI Yunbo Institute of Resource and Environment Henan Polytechnic University co.laborative Innovation Center of coalbed methane and Shale Gas for Central Plains Eco.omic Region State Key Laboratory of coal Resoures and Safe mining China University of Mining and TechnologyBeijing Yanghe coal Industry Zhengzhou Coal Mining Group Co.Ltd.

As the mercury emitted from coal co.bustion can lead to serious environmental issues, researchers pay more attention to the co.tent, distribution and occurrence of mercury in coal. In this paper, the co.tent, distribution, and occurrence of mercury in the Permian tectonically deformed coals from Peigou Mine, Xinmi coalfield, Henan Province were investigated. A total of 18 bench samples were taken from No.2-1 coals seam in Peigou Mine, including 15 coal bench samples, two roofs and one floor. The mercury co.centration, mineral co.position, and main inorganic element co.tent of 18 samples were determined by DMA-80 direct mercury analyzer, XRD, and XRF respectively. The results show that the mercury co.tent ranges from 0.047 ppm to 0.643 ppm, with an average of 0.244 ppm. Though the coal seam has turned into typical tectonically deformed coal by the strong tectonic destruction and plastic deformation, the vertical distribution of mercury has remarkable heterogeneity in coal seam section. By the analysis of co.relation between mercury and the main inorganic elements and the mineral co.position in coal, we infer that majority of mercury mainly relates to pyrite or kaolinite.

关键词： mercury in coal minerals in coal tectonically deformed coal modes of occurrence

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Experimental study on the deformation behaviour,energy evolution law and failure mechanism of tectonic coal subjected to cyclic loads

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International Journal of mining Science and technology 2022年第6期32卷 1301-1313页

作者： Deyi Gao Shuxun Sang Shiqi Liu Jian Wu Jishi Geng Wang Tao Tengmin Sun Key Laboratory of coalbed methane Resources and Reservoir Formation Process China University of Mining and TechnologyXuzhou 221116China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China Carbon Neutrality Institute China University of Mining and TechnologyXuzhou 221116China Jiangsu Key Laboratory of coal-based Greenhouse Gas co.trol and Utilization China University of Mining and TechnologyXuzhou 221116China China United coalbed methane co.Ltd.(CUCBM) Beijing 100083China

co.pared to intact coal,tectonic coal exhibits unique *** deformation behaviours under cyclic loading with different co.fining pressures and loading rates are monitored by MTS815 test system,and the mechanical and energy properties are analysed using experimental *** results show that the stress-strain curve co.ld be divided into four stages in a single *** elastic strain and elastic energy density increase linearly with deviatoric stress and are proportional to the co.fining pressure and loading rate;irreversible strain and dissipated energy density increase exponentially with deviatoric stress,inversely proportional to the co.fining pressure and loading *** internal structure of tectonic coal is divided into three types,all of which are damaged under different deviatoric stress levels,thereby explaining the segmentation phenomenon of stress-strain curve of tectonic coal in the cyclic loading *** coal exhibits nonlinear energy storage characteristics,which verifies why the tectonic coal is prone to coal and gas outburst from the principle of energy *** addition,the damage mechanism of tectonic coal is described from the point of energy distribution by introducing the co.cepts of crushing energy and friction energy.

关键词： Tectonic coal Cyclic loading Deformation behaviour Energy evolution Failure mechanism

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The generalized method for estimating reserves of shale gas and coalbed methane reservoirs based on material balance equation

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Petroleum Science 2022年第6期19卷 2867-2878页

作者： Jun-Tai Shi Yan-Ran Jia Long-Long Zhang Chang-Jiang Ji Guo-Fu Li Xian-Yue Xiong Hong-Xing Huang Xiang-Fang Li Sui-An Zhang State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum(Beijing) Beijing102249China coalbed methane Research Center China University of Petroleum(Beijing)Beijing102249China State Key Laboratory of coal and CBM co.mining in Nancun Town Jincheng048012ShanxiChina Petro China coalbed methane co.pany Limited Beijing100028China China United coalbed methane National Engineering Research Center co.Ltd Beijing100095China

As the main unco.ventional natural gas reservoirs,shale gas reservoirs and coalbed methane(CBM)reservoirs belong to adsorptive gas reservoirs,i.e.,gas reservoirs co.taining adsorbed *** gas and CBM reservoirs usually have the characteristics of rich adsorbed gas and obvious dynamic changes of porosity and permeability.A generalized material balance equation and the co.responding reserve evaluation method co.sidering all the mechanisms for both shale gas reservoirs and CBM reservoirs are *** this work,a generalized material balance equation(GMBE)co.sidering the effects of critical desorption pressure,stress sensitivity,matrix shrinkage,water production,water influx,and solubility of natural gas in water is ***,by co.verting the GMBE to a linear relationship between two parameter groups related with known formation/fluid properties and dynamic performance data,the straight-line reserve evaluation method is *** using the slope and the y-intercept of this straight line,the original adsorbed gas in place(OAGIP),original free gas in place(OFGIP),original dissolved gas in place(ODGIP),and the original gas in place(OGIP)can be quickly ***,two validation cases for shale gas reservoir and CBM reservoir are co.ducted using co.mercial reservoir simulator and the coalbed methane dynamic performance analysis software,***,two field studies in the Fuling shale gas field and the Baode CBM field are *** show that the GMBE and the co.responding straight-line reserve evaluation method are rational,accurate,and effective for both shale gas reservoirs and CBM *** detailed information about reserves of shale gas and CBM reservoirs can be clarified,and only the straight-line fitting approach is used to determine all kinds of reserves without iteration,proving that the proposed method has great advantages co.pared with other current methods.

关键词： Shale gas coalbed methane Material balance equation Reserve evaluation Dissolved gas Generalized method

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Desorption hysteresis of coalbed methane and its co.trolling factors: a brief review

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Frontiers of Earth Science 2021年第2期15卷 224-236页

作者： Weikai XU Junhui LI Xiang WU Du LIU Zhuangsen WANG co.lege of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing 100083China China coalbed methane co.Ltd Beijing 100011China

Most coal reservoirs show high gas co.tent with relatively low desorption efficiency,which restricts the efficiency of coalbed methane(CBM)extraction and single-well *** review highlights the desorption hysteresis mechanism and its co.trolling factors as well as methods and models to reveal desorption hysteresis and potential *** adsorption and desorption can be reco.ded by both gravimetric and volumetric *** different adsorption models are used,desorption is generally co.sidered with the Langmuir *** hysteresis is influenced by the petrophysical co.position,thermal maturity,pore structure distribution of the coal,reservoir temperature,and moisture and water *** for calculating desorption hysteresis include the area index,hysteresis index and introduction of a hysteresis factor and a hysteresis *** dynamics simulations of methane desorption are mainly based on theories of kinetics,thermodynamics,and potential *** interaction forces operating among coal,water,and methane molecules can be calculated from microsco.ic intermolecular forces(van der Waals forces).The desorption hysteresis mechanism and desorption process still lack quantitative probe methodologies,and future research should focus on coal wettability under the co.straints of liquid co.tent,potential energy adjustment mechanism,and quantitative analysis of methane desorption *** research is expected to reveal the desorption kinetics of methane through the use of the solid–liquid–gas three-phase co.pling theory associated with the quantitative analysis of methane desorption hysteresis,thereby enhancing the reco.ery rate and efficiency of CBM wells.

关键词： desorption hysteresis diffusion process kinetics multiphase co.pling coalbed methane production

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Geological co.trols on the CBM Productivity of No.15 coal Seam of Carboniferous–Permian Taiyuan Formation in Southern Qinshui Basin and Prediction for CBM High-yield Potential Regions

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Acta Geologica Sinica(English Edition) 2018年第6期92卷 2310-2332页

作者： ZHANG Zheng QIN Yong ZHUANG Xinguo LI Guoqing LIU Donghai Key Laboratory of Tectonics and Petroleum Resources China University of GeosciencesMinistry of Education Faculty of Earth Resources China University of Geosciences State Key Laboratory of Water Resource Protection and Utilization in coal mining Key Laboratory of coalbed methane Resources and Reservoir Formation Process Ministry of EducationChina University of Mining and Technology State Key Laboratory of coal and CBM co.mining Shanxi Jincheng Anthracite Mining Group Co. Ltd.

coalbed methane(CBM) resources in No.15 coal seam of Taiyuan Formation acco.nt for 55% of the total CBM resources in southern Qinshui Basin(SQB), and have a great production potential. This study aims at investigating the CBM production in No.15 coal seam and its influence factors. Based on a series of laboratory experiments and latest exploration and development data from local coal mines and CBM co.panies, the spatial characteristics of gas production of No.15 coal seam were analyzed and then the influences of seven factors on the gas productivity of this coal seam were discussed, including coal thickness, burial depth, gas co.tent, ratio of critical desorption pressure to original coal reservoir pressure(RCPOP), porosity, permeability, and hydrogeological co.dition. The influences of hydrological co.dition on CBM production were analyzed based on the discussions of four aspects: hydrogeochemistry, roof lithology and its distribution, hydrodynamic field of groundwater, and recharge rate of groundwater. Finally, a three-level analytic hierarchy process(AHP) evaluation model was proposed for predicting the CBM potentials of the No.15 coal seam in the SQB. The best prospective target area for CBM production of the No.15 coal seam is predicted to be in the districts of Panzhuang, Chengzhuang and south of Hudi.

关键词： coalbed methane gas productivity co.trolling factors production potential Taiyuan Formation southern Qinshui Basin

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