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在野外所测得的大地电磁测深曲线都受到了介质水平不均匀的影响,其解释不能真实地反映地电断面的性质。为了改善大地电磁测深的地质效果,本文用有限元法计算了高阻地垒型构造上大地电磁测深视电阻率曲线,讨论了地垒的高度、宽度、中间高阻层电阻率及侧面倾角等因素对视电阻率的影响。研究结果表明,可以根据视电阻率的变化特征大致给出地下构造的形态;在有利的条件下,可对某些地电参数作出粗略的估计。
The measured geomagnetic sounding curves in the field are affected by the uneven media level, and their interpretation can not truly reflect the nature of the geoelectric section. In order to improve the geologic effect of MTF, this paper calculated the apparent resistivity curve of the MTF in the high-resistivity stratum-type structure by using the finite element method, and discussed the height, width, resistivity of the middle high resistivity layer and the side Dip angle and other factors on the apparent resistivity. The results show that the morphology of underground structures can be roughly given according to the characteristics of apparent resistivity. Under favorable conditions, some of the geoelectric parameters can be roughly estimated.