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本文说明,在岩溶地区,当大地(灰岩)一空气界而上的反射波和侧面波二者之一可以忽略、二者之一与灰岩中的直达波形成极值明显的干涉曲线时,可以求出灰岩的相对介电常数和位相常数,井可由干涉曲线“分解”出直达波振幅进而求得灰岩的视吸收系数和视电阻率。同时给出了相应的近似计算方法,并通过理论模型和岩溶地区野外实测曲线的数字反演,验证了这些计算方法的可行性和精度。
This paper shows that in the karst area, when one of the reflected wave and the side wave on the earth (limestone) -air boundary is negligible, either one of them forms an extreme interference curve with the direct wave in the limestone , The relative permittivity and phase constant of limestone can be obtained. The direct wave amplitude can be “decomposed” by the interference curve to obtain the apparent absorption coefficient and apparent resistivity of limestone. At the same time, the corresponding approximate calculation method is given, and the feasibility and accuracy of these calculation methods are verified by theoretical models and numerical inversion of field measured curves in karst areas.