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大家知道,垂向电测深三层曲线在一定条件下对中间层具有S(H和A型)或T(K和Q型)等值性.三层曲线的这一性质已在电测深曲线的定量解释中得到了实际应用.其实,某些二层曲线也有类似性质.譬如,把G型(二层)量板上的理论曲线经平移后重新排列,则可看出不同参数(特别是μ_2≥5)的G型二层曲线的尾段都有相同的形状,并且当这些二层曲线的尾段彼此重合时,其第一层的特征点O(h_1,ρ_1)都将落在同一条倾角为45°的直线(S线)上(图1)-即它们第一层的纵向电导相同
As we all know, the vertical electric sounding three-layer curve has S (H and A type) or T (K and Q type) equivalent to the middle layer under certain conditions. In fact, some of the second-level curves have similar properties. For example, after the theoretical curves on the G-type (second-level) plates are rearranged and transposed, it can be seen that different parameters Are all the same shape at the tail of the G-type two-layer curves of μ_2≥5), and when the tail sections of these two-layer curves are coincident with each other, the first layer’s feature points O (h_1, ρ_1) On the same straight line (S line) with a dip angle of 45 ° (Figure 1) - that is, the vertical conductivity of the first layer is the same