基于核磁共振技术的弱胶结砂岩干湿循环损伤特性研究
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摘要
为研究岩石在干湿循环作用下的损伤演化规律,采用核磁共振技术对不同干湿循环条件下的弱胶结砂岩进行测试,得到岩石的T2谱分布曲线、谱峰面积及孔隙度。结果表明,随着干湿循环次数的增加,岩石T2谱曲线逐渐向右移动,但移动幅度逐渐减小;T2谱面积及孔隙度随干湿循环次数的增加逐渐增大,但其增长速率不断降低。采用孔隙度定义岩石损伤度,分析孔隙度与岩石损伤度之间的量化关系,并建立不同干湿循环次数与损伤度之间的函数关系。发现干湿循环作用对岩石的损伤程度随循环次数的增大而增加,但随着循环次数的持续增加,损伤速率不断降低,干湿循环作用对岩石的损伤程度趋于定值。
For the purpose of researching the damage evolution law of rock under drying-wetting cycles,the nuclear magnetic resonance(NMR) technique was used to test the weak cementation sandstone under different drying-wetting cycles,and the T2 spectrum distribution,T2 spectrum area and porosity were obtained. The results show that the T2 spectrum curve of rock moves to the right with increasing the number of drying-wetting cycles while the amplitude of the movement diminishes gradually. As the number of cycles increase,T2 spectrum area and porosity rise gradually,but the rate of the growth declines continually. The degree of rock damage is defined by the porosity. The quantitative relationship of the porosity with the rock damage was analysed,and the functional relationship between the number of drying-wetting cycles and the damage degree was established. It is shown that,with increasing the number of cycles,the damage degree to the rock caused by drying-wetting cycles increases while the damage rate decreases. The damage of rock caused by drying-wetting cycles tends to be close to a limit.
For the purpose of researching the damage evolution law of rock under drying-wetting cycles,the nuclear magnetic resonance(NMR) technique was used to test the weak cementation sandstone under different drying-wetting cycles,and the T2 spectrum distribution,T2 spectrum area and porosity were obtained. The results show that the T2 spectrum curve of rock moves to the right with increasing the number of drying-wetting cycles while the amplitude of the movement diminishes gradually. As the number of cycles increase,T2 spectrum area and porosity rise gradually,but the rate of the growth declines continually. The degree of rock damage is defined by the porosity. The quantitative relationship of the porosity with the rock damage was analysed,and the functional relationship between the number of drying-wetting cycles and the damage degree was established. It is shown that,with increasing the number of cycles,the damage degree to the rock caused by drying-wetting cycles increases while the damage rate decreases. The damage of rock caused by drying-wetting cycles tends to be close to a limit.
引文
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[13]李杰林,周科平,张亚民,等.基于核磁共振技术的岩石孔隙结构冻融损伤试验研究[J].岩石力学与工程学报,2012,31(6):1 208-1 214.(LI Jielin,ZHOU Keping,ZHANG Yamin,et al.Experimental study of rock porous structure damage characteristics under condition of freezing-thawing cycles based on nuclear magnetic resonance technique[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(6):1 208-1 214.(in Chinese))
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[17]钟祖良,罗玮坤,刘新荣,等.基于核磁共振技术的酸性环境下灰岩力学特性劣化试验[J].煤炭学报,2017,42(7):1 740-1 747.(ZHONG Zuliang,LUO Weikun,LIU Xinrong,et al.Experimental study on mechanical properties deterioration of limestone in acid environment based on nuclear magnetic resonance[J].Journal of China Coal Society,2017,42(7):1 740-1 747.(in Chinese))
[18]COATES G,肖立志,PRAMMER M.核磁共振测井原理与应用[M].孟繁萤译.北京:石油工业出版社,2007:6-7.(COATES G,XIAOLizhi,PRAMMER M.Nuclear magnetic resonance(NMR)logging principles and its application[M].Translated by MENG Fanying.Beijing:Petroleum Industry Press,2007:6-7.(in Chinese))
[19]张元中,肖立志.单轴载荷下岩石核磁共振特征的实验研究[J].核电子学与探测技术,2006,26(6):731-734.(ZHANG Yuanzhong,XIAO Lizhi.Experimental study of the nuclear magnetic resonance(NMR)characteristics in rock under uniaxial load[J].Nuclear Electronics and Detection Technology,2006,26(6):731-734.(in Chinese))
[20]刘新荣,袁文,傅晏,等.干湿循环作用下砂岩溶蚀的孔隙度演化规律[J].岩土工程学报,2018,40(3):527-532.(LIU Xinrong,YUAN Wen,FU Yan,et al.Porosity evolution of sandstone dissolution under wetting and drying cycles[J].Chinese Journal of Geotechnical Engineering,2018,40(3):527-532.(in Chinese))
[21]谢凯楠,姜德义,孙中光,等.基于低场核磁共振的干湿循环对泥质砂岩微观结构劣化特性影响研究[J].岩土力学,2019,40(2):1-8.(XIE Kainan,JIANG Deyi,SUN Zhongguang,et al.Influence of drying-wetting cycles on microstructure degradation of shaly sandstone using nuclear magnetic resonance[J].Rock and Soil Mechanics,2019,40(2):1-8.(in Chinese))
[22]刘新荣,李栋梁,王震,等.酸性干湿循环对泥质砂岩强度特性劣化影响研究[J].岩石力学与工程学报,2016,35(8):1 543-1 554.(LIU Xinrong,LI Dongliang,WANG Zhen,et al.The effect of dry-wet cycles with acidic wetting fluid on strength deterioration of shaly sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(8):1 543-1 554.(in Chinese))
[23]KACHANOV L M.On the time to failure under creep conditions[J].Izv.Akad Nauk,USSR,1958,(8):26-31.
[24]RABOTNOV Y N.On the equation of state of creep[C]//Proceedings of the Institution of Mechanical Engineers.[S.l.]:[s.n.],1963:2 117-2 122.
[2]DUDA M,RENNER J.The weakening effect of water on the brittle failure strength of sandstone[J].Geophysical Journal International,2013,192:1 091-1 108.
[3]刘新荣,李栋梁,张梁,等.干湿循环对泥质砂岩力学特性及其微细观结构影响研究[J].岩土工程学报,2016,38(7):1 291-1 300.(LIU Xinrong,LI Dongliang,ZHANG Liang,et al.Influence of wetting-drying cycles on mechanical properties and microstructure of shaly sandstone[J].Chinese Journal of Geotechnical Engineering,2016,38(7):1 291-1 300.(in Chinese))
[4]傅晏,王子娟,刘新荣,等.干湿循环作用下砂岩细观损伤演化及宏观劣化研究[J].岩土工程学报,2017,39(9):1 653-1 661.(FUYan,WANG Zijuan,LIU Xinrong,et al.Meso damage evolution characteristics and macro degradation of sandstone under wettingdrying cycles[J].Chinese Journal of Geotechnical Engineering,2017,39(9):1 653-1 661.(in Chinese))
[5]姚华彦,张振华,朱朝晖,等.干湿交替对砂岩力学特性影响的试验研究[J].岩土力学,2010,31(12):3 704-3 708.(YAO Huayan,ZAHNG Zhenhua,ZHU Chaohui,et al.Experimental study of mechanical properties of sandstone under cyclic drying and wetting[J].Rock and Soil Mechanics,2010,31(12):3 704-3 708.(in Chinese))
[6]王子娟,刘新荣,傅晏,等.两种pH水环境干、湿循环作用对泥质砂岩的侵蚀研究[J].岩土力学,2016,37(11):3 231-3 239.(WANG Zijuan,LIU Xinrong,FU Yan,et al.Erosion analysis of argillaceous sandstone under dry-wet cycle in two pH conditions[J].Rock and Soil Mechanics,2016,37(11):3 231-3 239.(in Chinese))
[7]宋朝阳,纪洪广,蒋华,等.干湿循环作用下弱胶结砂岩声发射特征及其细观劣化机理[J].煤炭学报,2018,43(增1):96-103.(SONG Chaoyang,JI Hongguang,JIANG Hua,et al.Influence of wetting-drying cycles on acoustic emission characteristics and mi-crostructure deterioration of weak cementation stratum[J].Journal of China Coal Society,2018,43(增1):96-103.(in Chinese))
[8]邓华锋,李建林,王孔伟,等.“饱水-风干”循环作用下砂岩损伤劣化规律研究[J].地下空间与工程学报,2011,7(6):1 091-1 096.(DENG Huafeng,LI Jianlin,WANG Kongwei,et al.Research on the deterioration rules of damaged sand rock under“saturation-air dry”cycles[J].Chinese Journal of Underground Space and Engineering,2011,7(6):1 091-1 096.(in Chinese))
[9]张超谟,陈振标,张占松,等.基于核磁共振T2谱分布的储层岩石孔隙分形结构研究[J].石油天然气学报,2007,29(4):80-86.(ZHANG Chaomo,CHEN Zhenbiao,ZHANG Zhansong,et al.Characteristics of reservoir rock pore fractal structure based on nuclear magnetic resonance(NMR)T2 distribution[J].Journal of Oil and Gas Technology,2007,29(4):80-86.(in Chinese))
[10]王胜.用核磁共振分析岩石孔隙结构特征[J].新疆石油地质,2009,30(6):768-770.(WANG Sheng.Analysis of rock pore structural characteristic by nuclear magnetic resonance[J].Xinjiang Petroleum Geology,2009,30(6):768-770.(in Chinese))
[11]LI N,WANG K W,ZHANG G,et al.Prediction of gas production in carbonates based on CT analysis and nuclear magnetic resonance(NMR)logging[J].Petroleum Exploration and Development,2015,42(2):167-174.
[12]杨更社,申艳军,贾海梁,等.冻融环境下岩体损伤力学特性多尺度研究及进展[J].岩石力学与工程学报,2018,37(3):545-563.(YANG Gengshe,SHEN Yanjun,JIA Hailiang,et al.Research progress and tendency in characteristics of multi-scale damage mechanics of rock under freezing-thawing[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(3):545-563.(in Chinese))
[13]李杰林,周科平,张亚民,等.基于核磁共振技术的岩石孔隙结构冻融损伤试验研究[J].岩石力学与工程学报,2012,31(6):1 208-1 214.(LI Jielin,ZHOU Keping,ZHANG Yamin,et al.Experimental study of rock porous structure damage characteristics under condition of freezing-thawing cycles based on nuclear magnetic resonance technique[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(6):1 208-1 214.(in Chinese))
[14]YAO Y B,LIU D M.Comparison of low-field NMR and mercury intrusion porosimetry in characterizing pore size distributions of coals[J].Fuel,2012,95:152-158.
[15]周科平,胡振襄,高峰,等.基于核磁共振技术的大理岩三轴压缩损伤规律研究[J].岩土力学,2014,35(11):3 117-3 122.(ZHOUKeping,HU Zhenxiang,GAO Feng,et al.Study of marble damage laws under triaxial compression condition based on nuclear magnetic resonance technique[J].Rock and Soil Mechanics,2014,35(11):3 117-3 122.(in Chinese))
[16]王萍,屈展.基于核磁共振的脆硬性泥页岩水化损伤演化研究[J].岩土力学,2015,36(3):687-693.(WANG Ping,QU Zhan.NMRtechnology based hydration damage evolution of hard brittle shale[J].Rock and Soil Mechanics,2015,36(3):687-693.(in Chinese))
[17]钟祖良,罗玮坤,刘新荣,等.基于核磁共振技术的酸性环境下灰岩力学特性劣化试验[J].煤炭学报,2017,42(7):1 740-1 747.(ZHONG Zuliang,LUO Weikun,LIU Xinrong,et al.Experimental study on mechanical properties deterioration of limestone in acid environment based on nuclear magnetic resonance[J].Journal of China Coal Society,2017,42(7):1 740-1 747.(in Chinese))
[18]COATES G,肖立志,PRAMMER M.核磁共振测井原理与应用[M].孟繁萤译.北京:石油工业出版社,2007:6-7.(COATES G,XIAOLizhi,PRAMMER M.Nuclear magnetic resonance(NMR)logging principles and its application[M].Translated by MENG Fanying.Beijing:Petroleum Industry Press,2007:6-7.(in Chinese))
[19]张元中,肖立志.单轴载荷下岩石核磁共振特征的实验研究[J].核电子学与探测技术,2006,26(6):731-734.(ZHANG Yuanzhong,XIAO Lizhi.Experimental study of the nuclear magnetic resonance(NMR)characteristics in rock under uniaxial load[J].Nuclear Electronics and Detection Technology,2006,26(6):731-734.(in Chinese))
[20]刘新荣,袁文,傅晏,等.干湿循环作用下砂岩溶蚀的孔隙度演化规律[J].岩土工程学报,2018,40(3):527-532.(LIU Xinrong,YUAN Wen,FU Yan,et al.Porosity evolution of sandstone dissolution under wetting and drying cycles[J].Chinese Journal of Geotechnical Engineering,2018,40(3):527-532.(in Chinese))
[21]谢凯楠,姜德义,孙中光,等.基于低场核磁共振的干湿循环对泥质砂岩微观结构劣化特性影响研究[J].岩土力学,2019,40(2):1-8.(XIE Kainan,JIANG Deyi,SUN Zhongguang,et al.Influence of drying-wetting cycles on microstructure degradation of shaly sandstone using nuclear magnetic resonance[J].Rock and Soil Mechanics,2019,40(2):1-8.(in Chinese))
[22]刘新荣,李栋梁,王震,等.酸性干湿循环对泥质砂岩强度特性劣化影响研究[J].岩石力学与工程学报,2016,35(8):1 543-1 554.(LIU Xinrong,LI Dongliang,WANG Zhen,et al.The effect of dry-wet cycles with acidic wetting fluid on strength deterioration of shaly sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(8):1 543-1 554.(in Chinese))
[23]KACHANOV L M.On the time to failure under creep conditions[J].Izv.Akad Nauk,USSR,1958,(8):26-31.
[24]RABOTNOV Y N.On the equation of state of creep[C]//Proceedings of the Institution of Mechanical Engineers.[S.l.]:[s.n.],1963:2 117-2 122.