基于CT三维重建的高阶煤孔裂隙结构综合表征和分析
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摘要
为有效研究煤的孔裂隙结构特征,实现对煤的孔裂隙结构的定性定量表征和分析。以内蒙古巴彦高勒煤矿311102运输巷的煤样为研究对象,基于ZEISS Xradia510 Versa X射线显微镜扫描得到的CT数据,结合三维可视化软件AVIZO中内置数学算法,提出了煤的孔裂隙结构定量表征的方法,并建立了煤的三维孔裂隙结构模型和具有拓扑结构的孔隙网络简化模型。通过本文提出的方法,对巴彦高勒煤矿煤样的孔裂隙微观参数——孔径大小、孔体积、孔隙率、配位数、喉道长度等进行了统计分析。研究表明:在微米的尺度下,内蒙古巴彦高勒煤矿的煤样以大孔为主,并伴有网状的割理裂隙,有效孔隙率为10.34%,通过孔隙网络模型统计出的孔隙数为12 834,喉道数为432及其他的微观结构参数。
To effectively study the characteristics of coal pore and fissures,the pore and fissures of coal were characterized by qualitative and quantitative characterization and analysis. The coal sample of 311102 working face in Bayangaole Colliery of Inner Mongolia was studied. Based on the IEISS Xradia 510 X-ray microscope Get the CT data. The mathematical algorithm was embedded in the three-dimensional visualization software AVIZO. The study proposed the methods of quantitative characterization of pore and fissure and set up a three-dimensional model of pore and fissure of coal and a pore network model with topology structure. The coal sample microscopic parameter of pore and fissures includes pore size, pore volume, porosity, coordination number and length of throat. The results show that under the micron scale the coal samples of Bayangaole Colliery are mainly in macroporous and have a cleat network. Its effective porosity is 10. 34%. The number of pores is 12 834, and the number of throats is 432. These are calculated by the pore network model.
To effectively study the characteristics of coal pore and fissures,the pore and fissures of coal were characterized by qualitative and quantitative characterization and analysis. The coal sample of 311102 working face in Bayangaole Colliery of Inner Mongolia was studied. Based on the IEISS Xradia 510 X-ray microscope Get the CT data. The mathematical algorithm was embedded in the three-dimensional visualization software AVIZO. The study proposed the methods of quantitative characterization of pore and fissure and set up a three-dimensional model of pore and fissure of coal and a pore network model with topology structure. The coal sample microscopic parameter of pore and fissures includes pore size, pore volume, porosity, coordination number and length of throat. The results show that under the micron scale the coal samples of Bayangaole Colliery are mainly in macroporous and have a cleat network. Its effective porosity is 10. 34%. The number of pores is 12 834, and the number of throats is 432. These are calculated by the pore network model.
引文
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[16]宋晓夏,唐跃刚,李伟,等.基于显微CT的构造煤渗流孔精细表征[J].煤炭学报,2013,38(3):435-440.SONG Xiaoxia,TANG Yuegang,LI Wei,et al.Advanced characterization of seepage pores in deformed coals based on micro-CT[J].Journal of China Coal Society,2013,38(3):435-440.
[17]LEE S,JOU H T,VAN Riessen A,et al.Three-dimensional quantification of pore structure in coal ash-based geopolymer using con-ventional electron tomography[J].Construction and Building Materials,2014,52;221-226.
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[19]WANG G,CHU X,YANG X.Numerical simulation of gas flow in artificial fracture coal by three-dimensional reconstruction based on computed tomography[J].Journal of Natural Gas Science and Engineering,2016,34:823-831.
[20]王刚,杨鑫祥,张孝强,等.基于DTM阈值分割法的孔裂隙煤岩体瓦斯渗流数值模拟[J].岩石力学与工程学报,2016,35(1):119-129.WANG Gang,YANG Xinxiang,ZHANG Xiaoqiang,et al.Numerical simulation of gas seepage in pore sand fissures of coal rock mass based on the DTM threshold segmentation method[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(1):119-129.
[21]李惠芬,蒋向前,李柱.高斯滤波稳健性能的研究与改进[J].仪器仪表学报,2004,25(5):633-637.LI Huifen,JIANG Xiangqian,LI Zhu.Study and improvement of robustness of gaussian filter[J].Acta Automatica Sinica,2004,25(5):633-637.
[22]潘梅森,肖政宏.用于图像处理的自适应均值滤波算法[J].微计算机信息,2006(11X):309-311.PAN Meisen,XIAO Zhenghong.An adaptive mean filter algorithm for image processing[J].Microcomputer Information,2006(11x):309-311.
[23]赵高长,张磊,武风波.改进的中值滤波算法在图像去噪中的应用[J].应用光学,2011,32(4):678-682.ZHAO Gaochang,ZHANG Lei,WU Fengbo.Application of improved median filtering algorithm to image de-noising[J].Journal of Applied Optics,2011,32(4):678-682.
[24]朱洪林.低渗砂岩储层孔隙结构表征及应用研究[D].成都:西南石油大学,2014.ZHU Honglin.Pore structure characterization of flow permeability sandstone reservoir and application[D].Chengdu:Southwest Petroleum University,2014:25-32.
[25]陈贞龙,王运海,王宁,等.延川南地区煤储层孔裂隙特征研究[J].油气藏评价与开发,2013,3(3):67-71.CHEN Zhenlong,WANG Yunhai,WANG Ning,et al.Research on the pore-fracture properties of coal reservoirs in South Yanchuan region[J].Reservoir Evaluation and Development,2013,3(3):67-71.
[26]陶云奇,许江,彭守建,等.含瓦斯煤孔隙率和有效应力影响因素试验研究[J].岩土力学,2010,31(11):3417-3422.TAO Yunqi,XU Jiang,PENG Shoujian,et al.Experimental study of of influencing factor of porosity and effective stress of gas-filled coal[J].Rock and Soil Mechanics,2010,31(11):3417-3422.
[27]DONG H.Micro-CT imaging and pore network extraction[D].London:Imperial College,2007.
[2]孟巧荣,赵阳升,胡耀青,等.焦煤孔隙结构形态的实验研究[J].煤炭学报,2011,36(3):487-490.MENG Qiaorong,ZHAO Yangsheng,HU Yaoqing,et al.Experimental study on pore structure and pore shape of coking coal[J].Journal of China Coal Society,2011,36(3):487-490.
[3]YAO Y,LIU D,TANG D,et al.Fractal characterization of seepagepores of coals from China:an investigation on permeability of coals[J].Computers&Geosciences,2009,35(6):1159-1166.
[4]LI H Y,OGAWA Y,SHIMADA S.Mechanism of methane flow through sheared coals and its role on methane recovery[J].Fuel,2003,82:1271-1279.
[5]降文萍,宋孝忠,钟玲文.基于低温液氮实验的不同煤体结构煤的孔隙特征及其对瓦斯突出影响[J].煤炭学报,2011,36(4):609-614.JIANG Wenping,SONG Xiaozhong,ZHONG Lingwen.Research on the pore properties of different coal body structure coals and the effects on gas outburst based on the low-temperature nitrogen adsorption method[J].Journal of China Coal Society,2011,36(4):609-614.
[6]张慧.煤孔隙的成因类型及其研究[J].煤炭学报,2001,26(1):40-44.ZHANG Hui.Genetical type of pores in coal reservoir and its research significance[J].Journal of China Coal Society,2001,26(1):40-44.
[7]邹俊鹏,陈卫忠,杨典森,等.基于SEM的珲春低阶煤微观结构特征研究[J].岩石力学与工程学报,2016,35(9):1805-1814.ZOU Junpeng,CHEN Weizhong,YANG Diansen,et al.The research of microstructure characteristics of Hunchun low-rank coal based on SEM[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(9):1805-1814.
[8]姚艳斌,刘大锰,黄文辉,等.两淮煤田煤储层孔-裂隙系统与煤层气产出性能研究[J].煤炭学报,2006,31(2):163-168.YAO Yanbin,LIU Dameng,HUANG Wenhui,et al.Research on the pore fractures system properties of coalbed methane reservoirs and recovery in Huainan and Huaibei coal-fields[J].Journal of China Coal Society,2006,31(2):163-168.
[9]曹涛涛,宋之光,罗厚勇,等.煤、油页岩和页岩微观孔隙差异及其储集机理[J].天然气地球科学,2015,26(11):2208-2218.CAO Taotao,SONG Zhiguang,LUO Houyong,et al.Microscopic pore difference and reservoir mechanism of coal,oil shale and shale[J].Natural Gas Geoscience,2015,26(11):2208-2218.
[10]SIMONS F J,VERHELST F,SWENNEN R.Quantitative characterization of coal by means of microfocal X-ray computed microtomography(CMT)and color image analysis(CIA)[J].International Journal of Coal Geology,1997,34:69-88.
[11]VAN GEET M,SWENNEN R,WEVERS M.Quantitative analysis of reservoir rocks by microfocus X-ray computerised tomography[J].Sedimentary Geology,2000,132(1):25-36.
[12]YAO Y,LIU D,CHE Y,et al.Non-destructive characterization of coal samples from China using microfocus X-ray computed tomography[J].International Journal of Coal Geology,2009,80(2):113-123.
[13]YAO Y,LIU D,CAI Y,et al.Advanced characterization of pores and fractures in coals bynuclear magnetic resonance and Xray computed tomography[J].Science China Earth Sciences,2010,53(6):854-862.
[14]于艳梅,胡耀青,梁卫国,等.应用CT技术研究瘦煤在不同温度下孔隙变化特征[J].地球物理学报,2012,55(2):637-644.YU Yanmei,HU Yaoqing,LIANG Weiguo,et al.Study on pore characteristics of lean coal at different temperature by CT technology[J].Chinese J.Geophys.,2012,55(2):637-644.
[15]HERIAWAN M N,KOIKE K.Coal quality related to microfractures identified by CT image analysis[J].International Journal of Coal Geology,2015,140:97-110.
[16]宋晓夏,唐跃刚,李伟,等.基于显微CT的构造煤渗流孔精细表征[J].煤炭学报,2013,38(3):435-440.SONG Xiaoxia,TANG Yuegang,LI Wei,et al.Advanced characterization of seepage pores in deformed coals based on micro-CT[J].Journal of China Coal Society,2013,38(3):435-440.
[17]LEE S,JOU H T,VAN Riessen A,et al.Three-dimensional quantification of pore structure in coal ash-based geopolymer using con-ventional electron tomography[J].Construction and Building Materials,2014,52;221-226.
[18]刘向君,朱洪林,梁利喜.基于微CT技术的砂岩数字岩石物理实验[J].地球物理学报,2014,57(4):1133-1140.LIU Xiangjun,ZHU Honglin,LIANG Lixi.Digital rock physics of sandstone based on micro-CT technology[J].Chinese J.Geophys.,57(4):1133-1140.
[19]WANG G,CHU X,YANG X.Numerical simulation of gas flow in artificial fracture coal by three-dimensional reconstruction based on computed tomography[J].Journal of Natural Gas Science and Engineering,2016,34:823-831.
[20]王刚,杨鑫祥,张孝强,等.基于DTM阈值分割法的孔裂隙煤岩体瓦斯渗流数值模拟[J].岩石力学与工程学报,2016,35(1):119-129.WANG Gang,YANG Xinxiang,ZHANG Xiaoqiang,et al.Numerical simulation of gas seepage in pore sand fissures of coal rock mass based on the DTM threshold segmentation method[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(1):119-129.
[21]李惠芬,蒋向前,李柱.高斯滤波稳健性能的研究与改进[J].仪器仪表学报,2004,25(5):633-637.LI Huifen,JIANG Xiangqian,LI Zhu.Study and improvement of robustness of gaussian filter[J].Acta Automatica Sinica,2004,25(5):633-637.
[22]潘梅森,肖政宏.用于图像处理的自适应均值滤波算法[J].微计算机信息,2006(11X):309-311.PAN Meisen,XIAO Zhenghong.An adaptive mean filter algorithm for image processing[J].Microcomputer Information,2006(11x):309-311.
[23]赵高长,张磊,武风波.改进的中值滤波算法在图像去噪中的应用[J].应用光学,2011,32(4):678-682.ZHAO Gaochang,ZHANG Lei,WU Fengbo.Application of improved median filtering algorithm to image de-noising[J].Journal of Applied Optics,2011,32(4):678-682.
[24]朱洪林.低渗砂岩储层孔隙结构表征及应用研究[D].成都:西南石油大学,2014.ZHU Honglin.Pore structure characterization of flow permeability sandstone reservoir and application[D].Chengdu:Southwest Petroleum University,2014:25-32.
[25]陈贞龙,王运海,王宁,等.延川南地区煤储层孔裂隙特征研究[J].油气藏评价与开发,2013,3(3):67-71.CHEN Zhenlong,WANG Yunhai,WANG Ning,et al.Research on the pore-fracture properties of coal reservoirs in South Yanchuan region[J].Reservoir Evaluation and Development,2013,3(3):67-71.
[26]陶云奇,许江,彭守建,等.含瓦斯煤孔隙率和有效应力影响因素试验研究[J].岩土力学,2010,31(11):3417-3422.TAO Yunqi,XU Jiang,PENG Shoujian,et al.Experimental study of of influencing factor of porosity and effective stress of gas-filled coal[J].Rock and Soil Mechanics,2010,31(11):3417-3422.
[27]DONG H.Micro-CT imaging and pore network extraction[D].London:Imperial College,2007.