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About the Journal

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Journal:
Coal Geology & Exploration
Establishment year:
1973
 
Periodicity:
Biomonthly
Supervised by:
Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp.
Sponsored by：
Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp.
Editor-in-chief:
 DONG Shuning
 
Associate E ditor-in-chief:

 LIU Cheng, James W. LaMoreaux 

 

Executive Editor-in-chief:
JIN Xianglan 

 

ISSN:
1001-1986
CN:
61-1155/P
Web:
www.mdkt.cbpt.cnki.net

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2009年04期目次

  • Molecular characterization of flash pyrolysates of Jurassic vitrinites in Northwest China and its geological implications

    LIU Dayong,PENG Ping'an,YU Chiling(The State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China)

    Vitrinite,the main maceral of humic coals,has complicated structure.And it's not easy to study the vitrinite structure using single method.So different kind of pyrolysis methods have been used for the purpose to reveal the structure of vitrinites.Result shows that the composition of adsorbed hydrocarbon is controlled by the type and maturity of vitrinites.Pyrolysates of telocollinite are mainly composed of aromatics while that of desmocollinite is mainly composed of aliphatics.And it shows that the ratio of aromatics in pyrolysate raises with maturity.Experiment of flash pyrolysis of vitrinites conducted at 600 ℃ shows similar result.TMAH methylation pyrolysis of vitrinites shows that there are abundant fatty acids in the structure of vitrinites.And the fatty acid may be the precursor of coal-formed hydrocarbon.

    2009 04 [Abstract][OnlineView][Download 213K]

  • The flowing and outburst mechanism of gas in coal-based pore and fractured medium

    HU Weiyue1,LI Jing1,WANG Shouquan2(1.Xi'an Branch,China Coal Research Institute,Xi'an 710054,China;2.Sichuan Coal Industry Group Limited Liability Company,Chengdu 610031,China)

    The paper analyzed the flowing conditions of gas in coal-based pore and fractured medium,discussed the basic movement equation of gas flow and diffusion in the pore and fractured medium as well as the main influence factors,analysed the coal and gas outburst mechanism and its dynamic conditions.It was recognized that gas flowing is the preliminary condition of coal and gas outburst,the gas pressure gradient is the basic force of coal and gas outburst.Coal and gas outburst was closely related to the gas pressure gradient instead of gas pressure.The coal and gas outburst conditions are mainly determined by gas pressure gradient and coal shear stress.It is easier to form coal and gas outburst in fractured coal due to its low permeability and high gas flowing resistance.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 146K]

  • Coal petrography variation in the sequence stratigraphic frame of the Jurassic coal measures of Dameigou mine area in Northern Qaidam Basin

    LU Jing1,SHAO Longyi1,JU Qi2,LIU Tianji2,WEN Huaijun2,LI Yonghong,ZHANG Fade,GAO Di1(1.State Key Laboratory of Coal Resources and Safety Mining,CUMTB,Beijing 100083,China;2.Qinghai Coalfield Geologic Bureau,Xining 810000,China)

    In order to reveal the relationship between the base level in the bog of inland basin and the coal petrography variation,principle of the sequence stratigraphy has been used to study the coal petrography variation in the sequence stratigraphic frame of the Jurassic coal measures of Dameigou mine area in Northern Qaidam Basin.A total of 9 sequence boundaries have been identified(including regional unconformity surface,incised valley,regional tectonic stress transforming interface and color of strata discontinuous surface),which divided Jurrasic coal measures into 3 second-order sequences and 8 third-order sequences.The major coals(coal F) in the research area were formed in the environment of highstand swamp in the abandoned braided river plain,the coal macerals are characterized by high inertinite(average 59.1 %) and low vitrinite(average 23.9 %).According to the variation of coal maceral in the vertical profile,coal F has been divided into 1 fourth-order sequence and 5 fifth-order sequences.In the vertical profile,vitrinite content of coal F has a trend of increase as a whole,which reflects the dynamic background of gradual rise of base level rise of the lacustrine transgressive system tract of the third-order sequence SIII6.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 776K]

  • An experimental research on coalbed spontaneous combustion simulation

    JING Xingpeng1,2,WANG Yachao1,WANG Weifeng1,PANG Xiangwei2,XU Ping2(1.School of Energy Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;2.Xi'an Branch,China Coal Research Institute,Xi'an 710054,China)

    In order to reduce coal mine disasters and to prevent spontaneous combustion of coal bed,the process of spontaneous combustion of coal bed was simulated.The regularities of ignition characteristics of coal samples was studied and analyzed by using test data of test table.The results have important guiding significance for analysis and prediction of the process of spontaneous combustion of coal bed as well as the control of spontaneous combustion hazards.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 270K]

  • Analysis of coal gas dynamic phenomenon in Xinmi coalfield

    BAI Xinhua1,2,JIA Tianrang2,ZHANG Zimin2,3,ZHANG Yugui2,3,LI Pu2(1.Henan Provincial Coal Bed Methane Development and Utilization Company Ltd.,Zhengzhou 450016,China;2.Institute of Gas-geology,Henan Polytechnic University,Jiaozuo 454003,China;3.Gas-geology Division,China Coal Society,Jiaozuo 454003,China)

    In order to study the dynamic phenomenon of low gas content and low gas pressure in Xinmi coalfield,and solve the problem of the damage caused by low index dynamic phenomenon,the paper analyzed the tectonic evolution since Indo-China period based on the theory of regional tectonic evolution,and statistically analyzed 38 coal-gas dynamic events and 167 consistent coefficient f in Xinmi coalfield by combination with "Rules for Preventing Coal-Gas Outburst" and practical experience.The results showed that dynamic phenomenon in Xinmi coalfield was represented by low gas content,low gas pressure and consistent coefficient f below 0.3.The researches based on the theory of comprehensive hypothesis show that widespread development of deformed coal and small consistent coefficient are the deep reasons of this phenomenon.

    2009 04 [Abstract][OnlineView][Download 204K]

  • Development of a controlling and decision-making system for coalbed methane drainage vertical wells

    NI Xiaoming1,SU Xianbo1,WANG Yanbin2(1.Institute of Energy Science and Engineering,Key Laboratory of Biogenictraces and Mineralization Process of Henan,Henan Polytechnic University,Jiaozuo 454000,China;2.School of Resource and Safety Engineering,China University of Mining and technology,Beijing 100083,China)

    Rational working system is the key to enhance gas production and save cost of the coalbed methane wells.According to extension characteristic of the fractured crack in coalbed methane wells,changing characteristic of the phase state during drainage,combined with pressure transferring model,and the Langmuir adsorption model,distinguishing identifiers in the different drainage stages were gained.Based on KGD model,combined with fracturing operating parameter and the relation between permeability and porosity,the permeability prediction models in the direction of minimal and maximal horizontal stress were built.Based on Darcy laws,combined with positive and negative effect of coal reservoir,the changing models of parameters in different drainage stages were built.Based on the pressure transferring characteristic and change of gas and water relative permeability,the drainage intensity models in the different drainage stages in the different processes were built;with the developing tool of VB,a controlling and decision-making system for coalbed methane drainage from vertical wells was developed.Results showed the preferable application prospect.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 279K]

  • The numerical simulation of seepage rule of coal-bed gas under the condition of inter-well interference

    YANG Xinle1,ZHANG Yongli2,Xiao Xiaochun2(1.School of Mechanical Engineering,Liaoning Technical University,Fuxin 123000,China;2.School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China)

    It's a beginning stage for application of the multi-well in coalbed methane extraction in China.It's so complicated to the mathematic theory of this technology that the resolve resolution can be gained hardly.But the numerical value can be obtained by the numerical simulation easily.And then the theory guidance of exploring cola-bed gas is supplied by numerical result.On the basis of hypothesis conditions,the mathematical model of seepage considering multi-well extraction condition is set up.Considering certain boundary and initial conditions,the mathematic software is used to calculate the pressure field,the funneled drop of pressure and velocity field after 100 day production of single well and multi-wells.The simulation result shows that the inter-well interference of pressure field and velocity field is strengthened,the area of funneled drop of pressure is expanded,the area of supplying and desorption is increased dramatically,the ability of desorption and steady production is improved as the number of well increases in certain production area and mining time.The advantage of inter-well interference extraction technology is showed through the simulation result.The theoretical basis is provided for coal-bed gas industrial extraction with multi-production wells.

    2009 04 [Abstract][OnlineView][Download 437K]

  • Coal floor strata failure depth test of working face at big mining depth

    JIANG Qinming(Hebei Jinniu Energy Resources Co.,Ltd.,Xingtai 054000,China)

    In accordance with the case of large mining depth in Xingdong coal mine,study on coal floor strata failure depth test of working face 2121 was carried out by water injection test.According to variation of unit injection quantity and distance between testing boreholes and working face advance,coal floor strata failure depth was determined by continual water injection and intermitted monitoring.It was shown that coal seam floor failure depth of working face 2121 was 32.5 to 5 m,approximately three times as deep as that of shallow working face(in genera l,9.15 to 12.0 m).Coal seam floor failure depth increased with mining depth.Potential risk of water inrush through coal seam floor of working face 2121 is much higher for deep mining than for shallow mining.Testing results provided scientific basis for formulating water prevention and control program for deep mining of Xingdong coal mine.

    2009 04 [Abstract][OnlineView][Download 236K]

  • A discussion on water inrush coefficient

    LIU Qisheng(Xi'an Branch,China Coal Research Institute,Xi'an 710054,China)

    Water inrush from coal seam floor is a kind of natural disaster during coal mining process in Northern China coal field.The main method for predicting water inrush from coal seam floor and evaluating the water inrush degree of coal mining with water pressure is water inrush coefficient method.However,calculation and determination of critical values of water inrush coefficient need to be studied further.Based on explaining coal mining with water pressure and water inrush coefficient,several formulas for calculating water inrush coefficient and determination methods of parameters were discussed,the origination and application condition of critical water inrush coefficient and a new formula of calculating water inrush coefficient were presented.Not only water pressure and aquiclude thickness but also fracture depth of coal seam floor,intrusion height and top aquiclude part in Ordovician limestone were considered in the formula which laid the foundation for calculating new critical value of water inrush coefficient.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 235K]

  • Design and analysis of water storage-drainage system in abandoned roadway of mine

    LING Chengpeng1,ZHOU Qiyou1,SUN Yajun2,WANG Gang1,WU Shiyan1(1.School of Earth Science and Engineering,Nanjing University,Nanjing 210093,China;2.School of Resource and Earth Science,China University of Mining and Technology,Xuzhou 221008,China)

    The system of water storage-drainage in abandoned roadway was established in the paper,it takes measures of impounding at peak of electricity costs and draining at valley of electricity costs in order to reduce expense of mine drainage.Based on previous research,formulas of water storage-drainage for area with gradient conduit shape were derived from hydraulic formula and mass conservation equation,drainage facilities were designed from security and economy.The conceptions of useless storage and useful storage of system were elicited.Eigenvalue of water storage-drainage under the conditions of gravity and different inflow were calculated.The change of water head,discharge,discharge proportion of storage from reservoir full to empty were analyzed.The results showed that,water head decreases linearly from maximum to minimum while draining from full-reservoir to empty-reservoir.Meanwhile,about half of storage has been drained at the first 1/3 time;then,80% of storage has been drained at the 2/3 time and discharge decreases linearly;at the last 1/3 time,discharge decreases quickly to water inflow and only 20% of storage is drained.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 400K]

  • Discussion on hazardous trace elements precipitation process in coal gangue

    WU Xuren1,2,HAO Qiyong2,FAN Shiyan2(1.College of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;2.Shandong Provincial Bureau of Coal Geology,Taian 271000,China)

    Introducing the concept of product life cycle in LCA(life cycle assessment),trace elements precipitation process was studied systematically in the whole life cycle of coal gangue as a by-product of coal mining.The results show that trace elements in coal gangue have a long-term course which is shown as precipitation-enrichment-precipitation in the whole period of coal gangue.With increase of weathering degree,environmental impact of coal gangue is gradually strengthened.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 122K]

  • Wang-Yu algorithm of non-circular critical slip surface for soil slop

    XIONG Zheng1,ZHOU Juan2,WU Faquan1(1.Key Laboratory of Engineering Geomechanics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;2.Hainan Highway Survey and Design Institute,Haikou 570206,China)

    A new method to locate critical slip surface of soil slop named Wang-Yu algorithm is proposed.This method's theory is intelligible,further more it has strong capacity of global optimum.Wang-Yu algorithm obtains the local optimum by calculating the trial slip surface in large-scale area,then takes the local optimum as initial value to proceed a small-scale and high-precision search in order to locate the critical slip surface finally.Two examples are given and the results are satisfactory.This method proved that it is applicable for complex soil slope.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 269K]

  • Jet grouting curtain supporting technology for shaft heading face through quicksand layers with confined water

    ZHU Mingcheng(Xi'an Branch,China Coal Research Institute,Xi'an 710054,China)

    In order to solve the problem of the shaft heading in quicksand layers with confined water,the article proves a kind of technology and equipment for jet grouting with holding cement slurry on the condition of pressured water.The important data such as technological parameters and cementing material strenghth for single pile building using grout-holding method under conditions of quicksand layers with confined water were obtained,providing foundation for further application of the technology.

    2009 04 [Abstract][OnlineView][Download 260K]

  • The hazards of coal refuse piles and their ecological reconstruction

    CHENG Gonglin,CHEN Yongchun(Huainan Mining Industry(Group)Co.,Ltd,Huainan 232001,China)

    Long time mining activities accumulate great amount of coal refuse which formes piles and becomes the main factor for environmental pollution and degradation in coal mining area.The hazards resulting from coal refuse piles in mining area include mainly induced fire,destroied landscape,polluted environments and geological hazards etc.The paper proposed measures for ecological reconstruction of vegetation to control coal refuse piles.The main tehcnical means include analysis of land-building conditions,transform of hilly area,matrix improvement,selection and culture of plant types.Stable ecological vegetation system can be finally realized in coal refuse piles through rational planning and design.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 115K]

  • The analysis and determination of shear strength of Jinle landslide slip zone

    LU Xuesong1,WENG Xinlong2,FAN Wenyan1,SUN Xiaolin2(1.Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;2.Exi Geo-engineering Investigation Institute of HuBei Province,Yichang 443000,China)

    Shear strength parameters of landslide sliding zone soil are the most important and basic parameters for landslide stable analysis and governance engineering design,and its size and changes can directly influence the stability calculation of landslide,and then we can obtain different results and be involved in effectiveness of control measures.The paper is about the determination of shear strength parameters,mainly comprehensive determination of shear strenghth of Jinle lanslide slip zone by laboratory test results、field shear test of landslide slip layer、back analysis method and theory of analogy comparison,and it is pointed out that the determination of shear strength parameters of landslide sliding zone soil must use various approachs.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 244K]

  • Rayleigh wave detection technology used in in-advance geological detection

    DING Baoguo,SHEN Yuejia(Geological Survey Department of Hegang Mining Group,Hegang 154100,China)

    Coal measures in Hegang mining area have been transformed by multiple tectonic movements and geological situation is complicated.In order to meet the requirements of production operation,Rayleigh wave detection technology was used in accurate detection and forecasting of geological situation.In underground coal mines,Rayleigh wave method was used to detect lower coal seam and structures ahead roadways and produced satisfactory results.The method has really enhanced the accuracy of geological forecasting and shows good prospective for its application in coal mines.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 257K]

  • The instantaneous frequency analysis of GPR data using empirical mode decomposition

    YANG Qiufen(Departement of physic,Xi'an University of Arts and Science,Xi'an 710065,China)

    The foundational theory about HHT(Hilbert-Huang Transform)based on EMD(empirical mode decomposition)is introduced in brief.The stop condition of EMD on the rear GPR data is discussed.The formula of calculating instantaneous frequency using IMF(intrinsic mode function)is presented.The identification of real buried object results shows that the IMF method is superior to the ordinary method.The multi-resolution of IMF is analyzed.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 257K]

  • Application of fine stratigraphic division and comparison based on wavelet analysis in Zhuang 9 block

    ZHAO Junlong1,LI Xinsheng2(1.School of Petroleum Resources,Xi'an Shiyou University,Xi'an 710065,China;2.Geophysical-Chemsical Prospecting Team,Shaanxi Geology Mineral Bureau,Xi'an 710043,China)

    For meeting the demand of building fine geologic correlation framework,the wavelet analysis technique was chosen to study the stratigraphic division and comparison,according to the plentiful data and the feature of mode extreme point of wavelet factor and zero crossing point and signal discontinuity model.By means of the wavelet changing on conventional logging curves,through selecting detail signals of third layer,log was reconstructed.Then the fine correlation section was built by combining the new log curves and the conventional log curves.Moreover,the technique was introduced for analysis of barrier and interbed.The study indicated that the result of stratigraphic division and comparison and analysis on barrier and interbed is reliable,the research meets well the demand of high definition sequence division,the effect is better than the traditional method.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 425K]

  • Development of the well bottom electricity-driven percussive and rotating drill tool

    LU Hongzhi,YAN Taining,JIANG Guosheng(China University of Geosciences,Wuhan 430074,China)

    To overcome limitation in traditional hydro and air-driven impactor,this paper introduced the development about the well bottom electricity-driven percussive and rotating drill tool based on the working principle of line electromotor.The tool includes well bottom electricity-driven impactor,motor driver,power battery.Motor driver receives commands from the surface,and then controls frequency and wallop of the electricity-driven impactor,consequently,fits different strata without lifting the drill pipe.The field experiment shows that the tool has high operability,reliability and drilling efficiency.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 215K]

  • Design of separating workpieces for drilling rod

    TIAN Dongzhuang(Xi'an Branch,China Coal Research Institute,Xi'an 710054,China)

    Drilling rod is the important equipment for drilling gas drainage boreholes presently.In drilling rod processing,workpiece loading and unloading are carried artificially,which causes high work intensity and low work efficiency.In order to realize automatic loading and unloading,we need design separating workpieces for drilling rod,taking the single drilling rod from bundle container.This paper chooses triaxial separating scheme,through analyzing three separating ways contrastively,and introduces the design idea and realization process of this scheme in detail.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 256K]

  • Wellbore dynamic surge pressure while tripping a drill pipe in slim hole drilling

    ZHANG Jie,YAN Taining(China University of Geosciences,Wuhan 430074,China)

    Dynamic surge pressure is the main factor that influences the stability of drilling hole while tripping a drill pipe in geologic drilling.In order to study the influence factors of the dynamic surge pressure,through the regressive analysis and probability statistics of russian scholar's experimental data,the paper demonstrates that the surge pressure has direct ratio relations with velocity of pipe trip and the depth of borehole and is also affected by the factors such as drilling fluid property,hole structure,and so on,and the formula of the surge pressure is finally given.The results of engineering cases prove that the formula is reliable,and the precision of prediction can meet engineering need.

    2009 04 v.37;No.214 [Abstract][OnlineView][Download 400K]