张吉怀铁路沿线页岩气对隧道的影响研究
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摘要
本文在充分收集资料和现场调查的基础上,采用钻探、测井、现场录井和解吸、样品分析测试等方法,对张吉怀铁路沿线页岩气对隧道的影响进行综合分析评估。测井结果表明张吉怀沿线页岩地层地温及孔内自然伽马处于正常值,气测量整体偏低;含气性结果表明页岩气含量低,一般含气量0. 005～0. 030 m3/t;室内试验结果表明有机碳含量极低～偏低,成熟度Ro有机质转化率含量低～较低;孔渗测试结果表明页岩地层属于特低孔低渗储层,不利于页岩气的储集。总体来说张吉怀铁路沿线寒武系、志留系页岩气对隧道的影响较小,可不按瓦斯隧道进行设计。本文所采用的页岩气隧道测试技术和评价方法可供类似工程参考。
Based on the full collection of data and on-the-spot investigation,this paper analyzes and evaluates the impact of shale gas on the tunnel along the Zhangjiajie-Jishou-Huaihua Railway by means of drilling,logging,field logging and analysis,sample analysis and testing. Logging results show that the geothermal and internal gamma rays in the shale stratum along this railway are normal and the gas measurements are generally low. Gas-bearing results show that shale gas content is low,typically within 0. 005 ～ 0. 030 m3/t. Laboratory tests show that the content of organic carbon is within very low to low,and the organic matter conversion rate is within low to lower. The results of pore permeability test show that the shale stratum belongs to the ultra-low porosity and low permeability layer,which is not conducive to the storage of shale gas. In general,the Cambrian and Silurian shale gas have less impact on the tunnels,and can not be designed according to the gas tunnels.The shale gas tunnel test technology and evaluation method used in this paper could be referred for similar projects.
Based on the full collection of data and on-the-spot investigation,this paper analyzes and evaluates the impact of shale gas on the tunnel along the Zhangjiajie-Jishou-Huaihua Railway by means of drilling,logging,field logging and analysis,sample analysis and testing. Logging results show that the geothermal and internal gamma rays in the shale stratum along this railway are normal and the gas measurements are generally low. Gas-bearing results show that shale gas content is low,typically within 0. 005 ～ 0. 030 m3/t. Laboratory tests show that the content of organic carbon is within very low to low,and the organic matter conversion rate is within low to lower. The results of pore permeability test show that the shale stratum belongs to the ultra-low porosity and low permeability layer,which is not conducive to the storage of shale gas. In general,the Cambrian and Silurian shale gas have less impact on the tunnels,and can not be designed according to the gas tunnels.The shale gas tunnel test technology and evaluation method used in this paper could be referred for similar projects.
引文
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[2]杨希祥.大丽铁路松桂一号隧道炭质页岩大变形地段综合施工技术[J].铁道建筑技术,2011(2):24-29.
[3]朱永伟.湖南雪峰山地区隧道页岩气测试与评价[D].兰州:兰州交通大学,2015.
[4]丁安徐,李小越,蔡潇,等.页岩气地质评价实验测试技术研究进展[J].天然气与石油,2014(2):43-48.
[5]康小兵.隧道工程瓦斯灾害危险性评价体系研究[D].成都:成都理工大学,2009.
[6]王社教,杨涛,张国生,等.页岩气主要富集因素与核心区选择及评价[J].中国工程科学,2012(6):94-100.
[7]刘玉婷.中外页岩气评价标准之比较研究[D].荆州:长江大学,2012.
[8]国土资源部.页岩气资源/储量计算与评价技术规范:DZ/T 0254-2014[S].北京:中国标准出版社,2014.
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[10]中华人民共和国铁道部.铁路工程不良地质勘察规程:TB 10027-2012[S].北京:中国铁道出版社,2012.
[11]中华人民共和国铁道部.铁路工程地质勘察规范:TB10012-2007[S].北京:中国铁道出版社,2014.
[12]中国铁路总公司.铁路隧道超前地质预报技术规程:Q/CR 9217-2015[S].北京:中国铁道出版社,2014.
[13]中国铁路总公司.铁路隧道工程风险管理技术规范:Q/CR 9247-2016[S].北京:中国铁道出版社,2016.