页岩渗流-损伤演化特征试验研究
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摘要
页岩属于低渗致密岩石,页岩储层渗透性是页岩气开采过程中的关键问题,基于岩石力学三轴渗透性试验,研究黔北下寒武统牛蹄塘组页岩渗流-损伤演化过程的特征。试验结果表明:页岩渗透率的变化与损伤作用与应力状态有着很强的关联性,页岩损伤演化过程存在不同阶段性特点,损伤主要发生在弹塑性变形阶段与在应变软化阶段;页岩渗透率演化落后于页岩损伤破坏演化过程;中等围压条件下试样出现局部变形带压缩带,造成页岩渗透率有一定程度的减小,压缩带是造成了页岩渗透率演化过程落后于页岩损伤破坏演化过程的原因。
Permeability of shale reservoirs is a key issue in shale gas extraction.Based on the triaxial permeability test of rock mechanics,the characteristics of shale seepage-damage evolution of Niutitang Formation of Lower Cambrian in northern Guizhou were studied.The experimental results showed that the shale damage evolution process has different stages.Damage occurs mainly in the elastoplastic deformation stage and in the strain softening stage.Shale permeability evolution is behind the shale damage evolution process.The compressive zone of the test specimen under medium confining pressure resulted in the shale permeability decreasing to a certain extent.The compression zone is the cause of shale permeability evolution lag behind shale damage evolution process.
Permeability of shale reservoirs is a key issue in shale gas extraction.Based on the triaxial permeability test of rock mechanics,the characteristics of shale seepage-damage evolution of Niutitang Formation of Lower Cambrian in northern Guizhou were studied.The experimental results showed that the shale damage evolution process has different stages.Damage occurs mainly in the elastoplastic deformation stage and in the strain softening stage.Shale permeability evolution is behind the shale damage evolution process.The compressive zone of the test specimen under medium confining pressure resulted in the shale permeability decreasing to a certain extent.The compression zone is the cause of shale permeability evolution lag behind shale damage evolution process.
引文
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[14]谢和平,陈志达.岩石连续损伤力学模型探讨[J].煤炭学报,1988,13(1):32-42.
[15]刘涛影,曹平,章立峰,等.高渗压条件下压剪岩石裂纹断裂损伤演化机制研[J].岩土力学,2012,33(6):1801-1808.
[2]陈天宇.页岩气开采机理研究进展[J].中国矿业,2014,23(6):14-18.
[3]SiavashGhabezloo,Jean Sulem,Sylvine Guedon,et al.Effective stress law for the permeability of a limestone[J].International Journal of Rock Mechanics&Mining Sciences,2009,46:297-306.
[4]Rob Heller,John Vermylen,Mark Zoback.Experimental investigation of matrix permeability of gas shales[J].AAPG Bulletin,2014,98(5):975-995.
[5]朱珍德,张爱军,徐卫亚.脆性岩石全应力_应变过程渗流特性试验研究[J].岩土力学,2002,23(5):555-559.
[6]王伟,徐卫亚,王如宾,等.低渗透岩石三轴压缩过程中的渗透性研究[J].岩石力学与工程学报,2015,34(1):40-47.
[7]彭苏萍,孟召平,土虎,等.不同围压下砂岩孔渗规律试验研究[J].岩石力学与工程学报,2003,22(5):742-746.
[8]黄远智,王恩志.低渗透岩石渗透率对有效应力敏感系数的试验研究[J].岩石力学与工程学报,2007,26(2):410-414.
[9]马占国,缪协兴,李兴华,等.破碎页岩渗透特性[J].采矿与安全工程学报,2007,24(3):260-264.
[10]陈天宇,冯夏庭,杨成祥,等.含气页岩渗透率的围压敏感性和各向异性研究[J].采矿与安全工程学报,2014,31(4):639-643.
[11]蔡美峰,何满潮,刘东艳.岩石力学与工程[M].北京:科学出版社,2013:460-461.
[12]谢和平.岩石混凝土损伤力学[M].徐州:中国矿业大学出版社,1990:136-152.
[13]彭瑞东,谢和平,鞠杨.砂岩拉伸过程中的能量耗散与损伤演化分析[J].岩石力学与工程学报,2007,26(12):2526-2531.
[14]谢和平,陈志达.岩石连续损伤力学模型探讨[J].煤炭学报,1988,13(1):32-42.
[15]刘涛影,曹平,章立峰,等.高渗压条件下压剪岩石裂纹断裂损伤演化机制研[J].岩土力学,2012,33(6):1801-1808.