基于工业CT扫描的数字煤心构建过程及裂缝形态表征
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摘要
为实现煤样内部裂隙结构信息的数字化,达到对其裂缝形态进行精确表征的目的,运用高精度工业显微CT,对采自安阳主焦矿的焦煤煤样进行精确扫描,利用VG Studio MAX图像分析软件,对基于CT扫描所得的可视化煤心进行裂缝提取,并对煤心的CT扫描图像进行量化分析。结果表明,基于工业显微CT扫描重建的三维数字煤心,能可靠地反映真实煤心的内部裂隙结构,图像处理软件能够对煤样中错综复杂的裂隙网络进行精确表征,满足科研工作者对裂隙煤岩体进行定量描述的要求。研究结果可为基于工业CT扫描的煤岩无损检测及数字煤心构建提供有益参考。
In order to accurately realize the digital characterization of the internal pore and fracture structure of coal samples,the coking coal samples collected from Anyang coal mine were scanned by high-precision industrial micro-CT.VG Studio MAX image software was used to extract cracks from the visualized coal core obtained by CT scanning,and the CT image of the coal core was quantitatively analyzed.The results showed that the three-dimensional digital core constructed by industrial micro-CT scan could reliably reflect the internal structure of raw coal,the image processing software could accurately characterize the intricate fracture network in raw coal core,so as to meet the quantitative description requirements in fractures of coal for many peer scientific researchers.The results provided a useful reference for non-destructive testing of coal and rock and digital coal core construction based on industrial CT scanning.
In order to accurately realize the digital characterization of the internal pore and fracture structure of coal samples,the coking coal samples collected from Anyang coal mine were scanned by high-precision industrial micro-CT.VG Studio MAX image software was used to extract cracks from the visualized coal core obtained by CT scanning,and the CT image of the coal core was quantitatively analyzed.The results showed that the three-dimensional digital core constructed by industrial micro-CT scan could reliably reflect the internal structure of raw coal,the image processing software could accurately characterize the intricate fracture network in raw coal core,so as to meet the quantitative description requirements in fractures of coal for many peer scientific researchers.The results provided a useful reference for non-destructive testing of coal and rock and digital coal core construction based on industrial CT scanning.
引文
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[15] 李易霖,张云峰,丛琳,等.X-CT扫描成像技术在致密砂岩微观孔隙结构表征中的应用——以大安油田扶余油层为例[J].吉林大学学报(地球科学版),2016,46(2):379-387.LI Y L,ZHANG Y F,CONG L,et al.Application of X-CT scanning technique in the characterization of micro pore structure of tight sandstone reservoir:Taking the Fuyu oil layer in Daan oilfield as an example[J].Journal of Jilin University(Earth Science Edition),2016,46(2):379-387.
[16] 王羽,汪丽华,王建强,等.利用纳米CT研究石柱龙马溪组页岩有机孔三维结构特征[J].岩矿测试,2017,36(6):580-590.WANG Y,WANG L H,WANG J Q,et al.Investigation of organic matter pore structures of Longmaxi shale in Shizhu area in three dimensions using Nano-CT[J].Rock and Mineral Analysis,2017,36(6):580-590.
[17] 王登科,张平,浦海,等.温度冲击下煤体裂隙结构演化的显微CT实验研究[J].岩石力学与工程学报,2018,37(10):2243-2252.WANG D K,ZHANG P,PU H,et al.Experimental research on crack evolution of coal under temperature impact based on industrial Micro-CT[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(10):2243-2252.
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[19] 孙先达.纳米CT技术在水驱后微观剩余油分布形态及量化分析中的应用[J].电子显微学报,2015,34(3):216-221.SUN X D.Application of Nano-CT technology to the study of distribution patterns and quantitative analysis in microscopic residual oil after water flooding and quantitative analysis[J].Journal of Chinese Electron Microscopy Society,2015,34(3):216-221.
[20] 程汉列,武博,郭旭,等.不同微观条件下的天然裂缝闭合特征对比分析[J].河南理工大学学报(自然科学版),2017,36(5):29-34.CHENG H L,WU B,GUO X,et al.Comparative analysis of natural fracture closure characteristics of different reservoir in microscopic conditions[J].Journal of Henan Polytechnic University(Natural Science),2017,36(5):29-34.
[21] WANG D K,LYU R H,WEI J P,et al.An experimental study of seepage properties of gas-saturated coal under different loading conditions[J].Energy Science & Engineering,2019,7(3):799-808.
[22] 陈俊杰,朱刘娟,闫伟涛,等.高强度开采地表裂缝分布特征及形成机理分析[J].中国安全生产科学技术,2015,11(8):96-100.CHEN J J,ZHU L J,YAN W T,et al.Analysis on distribution characteristic and formation mechanism of surface fissures caused by high intensity mining[J].Journal of Safety Science and Technology,2015,11(8):96-100.
[23] 李相臣,陈德飞,康毅力,等.基于CT扫描的煤岩孔裂隙表征[J].煤田地质与勘探,2016,44(5):58-62.LI X C,CHEN D F,KANG Y L,et al.Characterization of pores and fractures of coal based on CT scan[J].Coal Geology & Exploration,2016,44(5):58-62.
[24] 王刚,沈俊男,褚翔宇,等.基于CT三维重建的高阶煤孔裂隙结构综合表征和分析[J].煤炭学报,2017,42(8):2074-2080.WANG G,SHEN J N,CHU X Y,et al.Characterization and analysis of pores and fissures of high-rank coal based on CT three-dimensional reconstruction[J].Journal of China Coal Society,2017,42(8):2074-2080.
[25] CUI J,LIU D M,CAI Y D,et al.Insights into fractures and minerals in subbituminous and bituminous coals by FESEM-EDS and X-ray μ-CT[J].Fuel,2019,237:977-988.
[2] 江丹,蔡周荣,向俊洋.下扬子芜湖地区古生界泥页岩微孔-超微孔隙发育特征及其意义[J].电子显微学报,2017,36(3):250-257.JIANG D,CAI Z R,XIANG J Y.The development characteristics and the significance of the micro-ultra micro aperture of Paleozoic shale in Wuhu area,Lower Yangtze Platform[J].Journal of Chinese Electron Microscopy Society,2017,36(3):250-257.
[3] 岳立新,孙可明.超临界CO2增透煤微观图像重构及三维数值模拟[J].中国安全生产科学技术,2017,13(1):58-64.YUE L X,SUN K M.Microscopic image reconstruction and three-dimensional numerical simulation of supercritical CO2 permeability improvement coal[J].Journal of Safety Science and Technology,2017,13(1):58-64.
[4] 高兴军,齐亚东,宋新民,等.数字岩心分析与真实岩心实验平行对比研究[J].特种油气藏,2015,22(6):93-96.GAO X J,QI Y D,SONG X M,et al.Parallel comparison of digital core analysis and real core test[J].Special Oil and Gas Reservoirs,2015,22(6):93-96.
[5] HAZLETT R.Statistical characterization and stochastic modeling of pore networks in relation to fluid flow[J].Mathematical Geology,1997,29(6):801-822.
[6] WU K,NUMAN N,CRAWFORD J W,et al.An efficient Markov chain model for the simulation of heterogeneous soil structure[J].Soil Science Society of America Journal,2004,68(2):346-351.
[7] WU K J,MARINUS L J,VAN D,et al.3D stochastic modelling of heterogeneous porous media-applications to reservoir rocks[J].Transport in Porous Media,2006,65(3):443-467.
[8] DONG H,BLUNT M J.Micro-CT imaging and pore network extraction[D].London:Department of Earth Science and Engineering,Imperial College London,2008.
[9] 仵彦卿,曹广祝,王殿武.基于 X-射线 CT 方法的岩石小裂纹扩展过程分析[J].应用力学学报,2005,22(3):484-490.WU Y Q,CAO G Z,WANG D W.Micro-fracturing processes of rock by real-time observation of X-ray CT[J].Chinese Journal of Applied Mechanics,2005,22(3):484-490.
[10] 赵秀才.数字岩心及孔隙网络模型重构方法研究[D].青岛:中国石油大学,2009.ZHAO X C.Numerical rock construction and pore network extraction[D].Qingdao:China University of Petroleum(East China),2009.
[11] 雷健,潘保芝,张丽华.基于数字岩心和孔隙网络模型的微观渗流模拟研究进展[J].地球物理学进展,2018,33(2):653-660.LEI J,PAN B Z,ZHANG L H.Advance of microscopic flow simulation based on digital cores and pore network[J].Progress in Geophysics,2018,33(2):653-660.
[12] BAUER D,YOUSSEF S,BEKRI S,et al.Improving the estimations of petrophysical transport behavior of carbonate rocks using a dual pore network approach combined with computed microtomography[J].Transport in Porous Media,2012,94(2):505-524.
[13] CAO T,DUAN Y,YU B,et al.Pore-scale simulation of gas-water flow in low permeability gas reservoirs[J].Journal of Central South University,2014,21(7):2793-2800.
[14] 熊健,唐勇,刘向君,等.应用微CT技术研究砂砾岩孔隙结构特征——以玛湖凹陷百口泉组储集层为例[J].新疆石油地质,2018,39(2):236-243.XIONG J,TANG Y,LIU X J,et al.Using micro CT scanning technology to study characteristics of pore structures in sandy conglomerate:A case from baikouquan formation in Mahu Sag,Junggar basin[J].Xinjiang Petroleum Geology,2018,39(2):236-243.
[15] 李易霖,张云峰,丛琳,等.X-CT扫描成像技术在致密砂岩微观孔隙结构表征中的应用——以大安油田扶余油层为例[J].吉林大学学报(地球科学版),2016,46(2):379-387.LI Y L,ZHANG Y F,CONG L,et al.Application of X-CT scanning technique in the characterization of micro pore structure of tight sandstone reservoir:Taking the Fuyu oil layer in Daan oilfield as an example[J].Journal of Jilin University(Earth Science Edition),2016,46(2):379-387.
[16] 王羽,汪丽华,王建强,等.利用纳米CT研究石柱龙马溪组页岩有机孔三维结构特征[J].岩矿测试,2017,36(6):580-590.WANG Y,WANG L H,WANG J Q,et al.Investigation of organic matter pore structures of Longmaxi shale in Shizhu area in three dimensions using Nano-CT[J].Rock and Mineral Analysis,2017,36(6):580-590.
[17] 王登科,张平,浦海,等.温度冲击下煤体裂隙结构演化的显微CT实验研究[J].岩石力学与工程学报,2018,37(10):2243-2252.WANG D K,ZHANG P,PU H,et al.Experimental research on crack evolution of coal under temperature impact based on industrial Micro-CT[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(10):2243-2252.
[18] 王登科,张平,刘淑敏,等.温度冲击下煤层内部孔缝结构演化特征实验研究[J].煤炭学报,2018,43(12):3395-3304.WANG D K,ZHANG P,LIU S M,et al.Experimental study on evolutionary characteristics of pore-fissure structure in coal seam under temperature impact[J].Journal of China Coal Society,2018,43(12):3395-3304.
[19] 孙先达.纳米CT技术在水驱后微观剩余油分布形态及量化分析中的应用[J].电子显微学报,2015,34(3):216-221.SUN X D.Application of Nano-CT technology to the study of distribution patterns and quantitative analysis in microscopic residual oil after water flooding and quantitative analysis[J].Journal of Chinese Electron Microscopy Society,2015,34(3):216-221.
[20] 程汉列,武博,郭旭,等.不同微观条件下的天然裂缝闭合特征对比分析[J].河南理工大学学报(自然科学版),2017,36(5):29-34.CHENG H L,WU B,GUO X,et al.Comparative analysis of natural fracture closure characteristics of different reservoir in microscopic conditions[J].Journal of Henan Polytechnic University(Natural Science),2017,36(5):29-34.
[21] WANG D K,LYU R H,WEI J P,et al.An experimental study of seepage properties of gas-saturated coal under different loading conditions[J].Energy Science & Engineering,2019,7(3):799-808.
[22] 陈俊杰,朱刘娟,闫伟涛,等.高强度开采地表裂缝分布特征及形成机理分析[J].中国安全生产科学技术,2015,11(8):96-100.CHEN J J,ZHU L J,YAN W T,et al.Analysis on distribution characteristic and formation mechanism of surface fissures caused by high intensity mining[J].Journal of Safety Science and Technology,2015,11(8):96-100.
[23] 李相臣,陈德飞,康毅力,等.基于CT扫描的煤岩孔裂隙表征[J].煤田地质与勘探,2016,44(5):58-62.LI X C,CHEN D F,KANG Y L,et al.Characterization of pores and fractures of coal based on CT scan[J].Coal Geology & Exploration,2016,44(5):58-62.
[24] 王刚,沈俊男,褚翔宇,等.基于CT三维重建的高阶煤孔裂隙结构综合表征和分析[J].煤炭学报,2017,42(8):2074-2080.WANG G,SHEN J N,CHU X Y,et al.Characterization and analysis of pores and fissures of high-rank coal based on CT three-dimensional reconstruction[J].Journal of China Coal Society,2017,42(8):2074-2080.
[25] CUI J,LIU D M,CAI Y D,et al.Insights into fractures and minerals in subbituminous and bituminous coals by FESEM-EDS and X-ray μ-CT[J].Fuel,2019,237:977-988.
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