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可溶岩地层的地球物理特征及其地质解译
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引用本文:汤克轩,赵楠.可溶岩地层的地球物理特征及其地质解译[J].中国岩溶,2019,(4):578-583. TANG Kexuan,ZHAO Nan.Geophysical characteristics and geological interpretation of karst strata[J].Carsologica Sinica,2019,(4):578-583.
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汤克轩 中水北方勘测设计研究有限责任公司天津 300222 
赵楠 中水北方勘测设计研究有限责任公司天津 300222 
中文摘要:为查明某水利枢纽工程区域岩溶发育特征,对云南省某水利工程测区开展了以瞬变电磁法和微动探测为主的物探测试工作。测试结果表明:岩溶作用会造成可溶岩地层物性分布的不均匀性;工程区域岩溶发育受岩体结构面和岩性分布影响显著,且在垂向上表现出成层性;强风化带和构造破碎带附近往往会伴随岩溶的发育,出现大范围或者离散状的低电阻率和低波速异常,裂隙性溶蚀可能极大程度改变岩体电性参数特征,但对岩体弹性参数特征影响相对较小;岩体电性和弹性参数的离散系数可用来表征岩体的抗溶蚀风化能力及岩溶的发育程度,结合其物性参数大小和分布特征,可有效分析岩溶发育情况及其充填物性质。
中文关键词:岩溶  地球物理特征  离散系数  孔渗结构  构造  电阻率
 
Geophysical characteristics and geological interpretation of karst strata
Abstract:To investigate the karst development characteristics in a water conservancy project area in Yunnan Province, a geophysical survey using transient electromagnetic and microtremor detection methods has been conducted. Analysis of the survey data shows that karstification can cause inhomogeneity of the physical properties in carbonate strata; the karst development in the engineering area is significantly affected by the structural plane and lithology distribution of the rock and it shows a certain layering in the vertical direction. The strong weathering zone and the fracture zone is often accompanied by the development of karst with the presence of large scale or discrete low resistivity and low wave velocity anomalies. Erosion along fractures can change the electrical parameters of the rock to a very large extent, but the impact on its elastic parameters is relatively low. The discrete coefficients of electrical and elastic parameters of rock can be used to characterize the resistance to erosion and weathering of rock mass as well as the degree of karst development. In combination with the magnitude and distribution of physical properties of rock, these coefficients can effectively help to analyze the karst development and nature of its filling material.
keywords:karst, geophysical characteristics, discrete coefficient, crack dissolution, structure, resistivity
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