音频大地电磁法在中甸断裂勘察中的应用

电磁勘探方法是探测地球浅部电性构造的一种实验方法。以中甸断裂勘察为例,利用音频大地电磁,通过反演解释振幅和相位曲线得到其地电断面信息,研究了地电断面电阻率的差异进而区分岩性及构造体,并根据电阻率量值的大小以及在地下的展布形式来识别地下地质体空间分布和性质。勘察结果给出了测区目标断裂的位置和规模,较好地区分了破碎层与完整基岩,为后续工作的开展提供了地球物理依据。结果表明,音频大地电磁法在探测浅层破碎带方面是有效的。

APPLICATION OF AUDIO MAGNETOTELLURIC IN ZHONGDIAN FOR FAULTED ZONE EXPLORATION

The electromagnetic exploration is the method to detect the shallow electrical structure of the Earth. Take ZhongDian fault investigation as an example, the amplitude and phase through the inversion curve has been interpreted geoelectric section of its information with the audio magnetotelluric. We study the differences in electrical resistivity cross-section of lithology and structure. Furthermore, we distinguish underground spatial distribution and property of geologic body based on volume resistivity value of the size and form in the ground spread to identify the spatial distribution and underground geological nature. Survey of the target survey area given the location and size of fracture, a broken layer of the distinction between good and integrity of the bedrock, for the follow-up work carried out to provide a geophysical basis. The results show that audio magnetotelluric method in the detectiolt of shallow fracture zone is effective.