井间电磁波CT技术在长江大堤岩溶探测中的应用
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摘要
地下井间电磁波法层析技术(CT)是一门新技术,它将医学CT的原理成功地运用于地学中,依照电磁波在地下有耗介质中传播规律及一定的物理和数学关系,反演透视剖面上的物理参数的分布,最后以图像的形式表现出来。长江大堤武汉段附近的碳酸盐岩地区,由于地势较低和长江水位动态变化,使地下水长期作用于灰岩裂隙,往往使岩溶或破碎带更加发育,形成地下溶洞,给长江大堤和附近的工农业生产、居民生活带来极大的隐患和危险。通过井间电磁波法层析技术共90个电磁波CT剖面测试,发现有28个CT剖面出现异常。此次的探测,为长江大堤周边安全的防治提供可靠精确的地下地质资料。
Computerized tomography(CT)of cross-borehole electromagnetic is an advanced technology which successfully uses the principle of CT of medicine in geology.It reflects the physical parameter distribution in scenographic profile according the propagation of electromagnetic waves in lossy media and definite relation between physics and mathematics,finally gives the results by images.The Yangtze River Levees near the Wuhan section are in the area of carbonate rocks,as low-lying and the dynamic changes of Yangtze River water level which make underground water to erode limestone,generates more developed fissures,karst,fractures and so on,causing enormous hidden danger and risk to Yangtze River levee and affecting adjacent industry and agriculture production as well as the security of residents.Through electromagnetic wave CT in cross-borehole test at 90 observations,we have found that 28 observations are anomalous.This detection could provide accurate and reliable subsurface geological information for the safety assessment and early warning of the adjacent area around Yangtze River Levee.
Computerized tomography(CT)of cross-borehole electromagnetic is an advanced technology which successfully uses the principle of CT of medicine in geology.It reflects the physical parameter distribution in scenographic profile according the propagation of electromagnetic waves in lossy media and definite relation between physics and mathematics,finally gives the results by images.The Yangtze River Levees near the Wuhan section are in the area of carbonate rocks,as low-lying and the dynamic changes of Yangtze River water level which make underground water to erode limestone,generates more developed fissures,karst,fractures and so on,causing enormous hidden danger and risk to Yangtze River levee and affecting adjacent industry and agriculture production as well as the security of residents.Through electromagnetic wave CT in cross-borehole test at 90 observations,we have found that 28 observations are anomalous.This detection could provide accurate and reliable subsurface geological information for the safety assessment and early warning of the adjacent area around Yangtze River Levee.
引文
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[2]郭贵安,魏柏林.井间电磁波CT技术在溶洞探测中的应用[J].华南地震,1999,19(4):28-34.Guo G A,Wei B L.Prospecting corroded cavities using cross-section electromagnetic tomographic technique between boreholes[J].South China Journal of Seismology,1999,19(4):28-34.
[3]Wilt M J,Morrison H F.Monitoring subsurface changes over time with cross-well electromagnetic tomography[J].Geophysical Prospecting,1995,43(7):873-902.
[4]邓争荣,熊永红,蔡加兴.钻孔电磁波CT在岩溶探测中的应用[J].长江工程职业技术学院学报,2004,21(4):32-34.Deng Z R,Xiong Y H,Cai J X.Application of drilling electromagnetic wave CT in karst exploration[J].Application of Drilling Electromagnetic wave CT in Karst Exploration,2004,21(4):32-34.
[5]高文利,马兰,罗德建,等.JW-5型地下电磁波探测系统设计[J].物探化探计算技术,2005,27(3):223-226.Gao W L,Ma L,Luo D J,et al.The design of JW-5 borehole em system,Computing Techniques for Geophysical and Geochemical Exploration,2005,27(3):223-226.
[6]钻孔电磁波法编写组.钻孔电磁波法[M].北京:地质出版社,1982:50-100.The Group of Electromagnetic Method.Electromagnetic methods in borehole[M].Beijing:Geological Publishing House,1982:50-100.
[7]冯锐.电磁波层析成像[J].地震学报,1997,19(5):524-534.Feng R.Electromagnetic wave tomography[J],Acta Seismologica Sinica,1997,19(5):524-534.
[8]高星.地震层析成像研究的回顾与展望[J].地球物理学进展,2000,15(4):42-44.Gao X.Advance and review in seismic tomography research[J].Progress in Geophysics,2000,15(4):42-44.
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