沁水盆地寺河矿3~#煤层弹性参数与吸附能力的关系
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摘要
以寺河矿3~#煤层为研究对象,开展煤的工业分析、高压等温吸附试验和超声速度测试等工作。通过分析煤的物质组成、煤的弹性参数和煤的甲烷吸附能力三者之间的关系,研究煤的弹性参数与甲烷吸附能力的关系。结果表明:(1)煤的甲烷吸附能力与煤的波阻抗、弹性模量(体积模量K、剪切模量μ、杨氏模量E)、纵横波速度和体密度呈负相关关系:即煤岩强度越弱,煤岩的兰氏体积越大,甲烷吸附能力越强;杨氏模量、剪切模量和纵波阻抗与兰氏体积的相关性依次升高。(2)煤的弹性参数与煤对甲烷吸附能力存在负相关关系的内在控制机理是:煤中孔隙度越大、煤的矿物越少、有机质越多,对应着更低的弹性强度,也对应着更大的兰氏体积,即更大的吸附能力。其中,煤的物质组成作为煤层甲烷的直接吸附场所,同时也是连接煤岩弹性参数与煤岩甲烷吸附能力的桥梁。研究成果可以为煤层气有利富集区预测提供岩石物理指导。
Taking the coal No. 3 in the Sihe coalmine as subject investigated,carried out coal proximate analysis,high pressure isothermal adsorption test and ultrasonic velocity measurement. Through relationship analysis among the coal material composition,elastic parameters and methane adsorptivity studied the relationship between elastic parameters and methane adsorptivity. The result has shown:(1) Between coal methane adsorptivity and wave impedance,elastic modulus( bulk modulus K,shear modulus μ and Young's modulus E),P wave,S wave velocities and bulk density is negatively interrelated. That is the weaker the coal lithologic strength,the greater the coal lithologic Langmuir's volume corresponding to higher methane adsorptivity. In addition,the interdependency between Young's modulus,shear modulus,P wave impedance and Langmuir's volume heightening successively.(2) The internal control mechanism of negative correlation between coal elastic parameters and methane adsorptivity is the larger the coal porosity,the less the minerals and more organic matter in coal,corresponding to the lower elastic strength,and corresponding to greater Langmuir's volume too,namely greater adsorptivity. In which,coal material composition as the direct adsorption site,also is a bridge directly between coal elastic parameters and methane adsorptivity. The studied results can provide rock physics guidance for CBM favorable enrichment area prediction.
Taking the coal No. 3 in the Sihe coalmine as subject investigated,carried out coal proximate analysis,high pressure isothermal adsorption test and ultrasonic velocity measurement. Through relationship analysis among the coal material composition,elastic parameters and methane adsorptivity studied the relationship between elastic parameters and methane adsorptivity. The result has shown:(1) Between coal methane adsorptivity and wave impedance,elastic modulus( bulk modulus K,shear modulus μ and Young's modulus E),P wave,S wave velocities and bulk density is negatively interrelated. That is the weaker the coal lithologic strength,the greater the coal lithologic Langmuir's volume corresponding to higher methane adsorptivity. In addition,the interdependency between Young's modulus,shear modulus,P wave impedance and Langmuir's volume heightening successively.(2) The internal control mechanism of negative correlation between coal elastic parameters and methane adsorptivity is the larger the coal porosity,the less the minerals and more organic matter in coal,corresponding to the lower elastic strength,and corresponding to greater Langmuir's volume too,namely greater adsorptivity. In which,coal material composition as the direct adsorption site,also is a bridge directly between coal elastic parameters and methane adsorptivity. The studied results can provide rock physics guidance for CBM favorable enrichment area prediction.
引文
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[21]韩德馨,任德贻,王延斌.中国煤岩学[M].江苏徐州:中国矿业大学出版社,1996.HAN Dexin,Ren Deyi,WAGN Yanbin,et al.Coal petrology of china[M].Xu zhou:China University of Mining&Technology Press,1996.
[2]彭苏萍,高云峰,杨瑞召,等.AVO探测煤层瓦斯富集的理论探讨和初步实践——以淮南煤田为例[J].地球物理学报,2005(06):262-273.Peng S P,Gao Y F,Yang RZ,et al.Theory and application of AVO for detection of coalbed methane—A case from the Huainan coalfield.Chinese J.Geophys.2005,48(6):262-273.
[3]杜文凤,彭苏萍,王珂,等.瓦斯突出煤和非突出煤AVO响应的比较[J].中国煤炭地质,2010,(06):45-48.Du Wenfeng,Peng S P,Wang Ke,et al.AVO response comparison between gas outburst coal and non otburst coal[J].Coal Geology of China,2010(06):45-48.
[4]孙斌,杨敏芳,孙霞,等.基于地震AVO属性的煤层气富集区预测[J].天然气工业,2010(06):15-18.Sun Bin,Yang Minfang,Sun Xia,et al.Prediction of coalbed methane enrichment zones based on AVO attributes[J].Natural Gas Industry,2010(06):15-18.
[5]林建东,陈信平,胡超元,等.煤层气勘探开发从“以工程为主导”到“预测指导下的工程”之转变[J].中国煤炭地质,2012(03):48-52.Lin Jiandong,Chen Xinping,Hu Chaoyuan,et al.Transformation of CBM Exploration and Exploitation from”Project Dominant“to“Prediction Guiding Project”[J].Coal Geology of China,2012(03):48-52.
[6]彭苏萍,杜文凤,殷裁云,等.基于AVO反演技术的煤层含气量预测[J].煤炭学报,2014,(09):1792-1796.Peng Suping,Du Wenfeng,Yin Caiyun,et al.Coal-bed gas content prediction based on AVO inversion[J].Journal of China Coal Society,2014,39(9):1792-1796.
[7]陈信平,霍全明,林建东,等.煤层气储层含气量与其弹性参数之间的关系——思考与初探[J].地球物理学报,2013,(08):2837-2848.Chen X P,Huo Q M,Lin J D,et al.The relation between CBM content and the elastic parameters of CBM reservoirs:Reasoning and initial probing.Chinese J.Geophys.2013,56(8):2837-2848.
[8]苏现波,林晓英.煤层气地质学[M].北京:煤炭工业出版社,2009.Su Xianbo,Lin Xiaoying.Coalbed methane geology[M].Beijing:Coal Industry Press,2009.
[9]Langmuir I.THE ADSORPTION OF GASES ON PLANE SURFACES OF GLASS,MICA AND PLATINUM[J].Journal of the American Chemical Society,1918,40(9):1361-1403.
[10]孟召平,田永东,李国富.煤层气开发地质理论与方法[M].北京:科学出版社,2010.Meng Zhaoping,Tian Yongdong,Li Guofu.Theory and method of coalbed methane development geology[M].Beijing:Science Press,2010.
[11]宋党育.煤中矿物质的定量及赋存特征研究[M].中国矿业大学出版社,2011.Song Dangyu.Quantitative and occurrence characteristics of minerals in coal[M].2-4.China University of Mining&Technology Press,2011.
[12]杨金和,陈文敏,段云龙.煤炭化验手册[M],北京:煤炭工业出版社,2004.YAGN Jinhe,CHEN Wenmin,DUAN Yunlong.Handbook of coal Testing[M].Beijing:China Coal Industry Publishing House Press,2004.
[13]孟召平,刘常青,贺小黑,等.煤系岩石声波速度及其影响因素实验分析[J].采矿与安全工程学报,2008(04):389-393.Meng Zhaoping,Liu Changqing,He Xiaohei,et al.Experimental Research on Acoustic Wave Velocity of Coal Measures Rocks and Its Influencing Factors[J].Journal of mining and safety engineering,2008(04):389-393.
[14]Mavko G,Mukerji T,Dvorkin J.,The rock physics handbook:Tools for seismic analysis of porous media,Cambridge university Press,2009.
[15]Morcote A,Mavko G,Prasad M,et al.Dynamic elastic properties of coal[J].Geophysics,2010,75(6).
[16]Yan F,Han D.Measurement of elastic properties of kerogen[J].Seg Technical Program Expanded Abstracts,2013:2778-2782.
[17]Dirgantara F,Batzle M,Curtis J B,et al.Maturity Characterization and Ultrasonic Velocities of Coals[J].Seg Technical Program Expanded Abstracts,2011:2308-2312.
[18]Shitrit O,Hatzor Y H,Feinstein S,et al.Effect of kerogen on rock physics of immature organic-rich chalks[J].Marine and Petroleum Geology,2016,73:392-404.
[19]Lucier A M,Hofmann R,Bryndzia L T,et al.Evaluation of variable gas saturation on acoustic log data from the Haynesville Shale gas play,NW Louisiana,USA[J].Geophysics,2011,30(3):300-311.
[20]Shitrit O,Hatzor Y H,Feinstein S,et al.Effect of kerogen on rock physics of immature organic-rich chalks[J].Marine and Petroleum Geology,2016:392-404.
[21]韩德馨,任德贻,王延斌.中国煤岩学[M].江苏徐州:中国矿业大学出版社,1996.HAN Dexin,Ren Deyi,WAGN Yanbin,et al.Coal petrology of china[M].Xu zhou:China University of Mining&Technology Press,1996.