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大地电磁测深资料的二维解释主要有两种方法,即二维反演拟合和二维数值模拟。作者参考二维三次样条快速反演方法的思路,在一维样条插值的基础上作形式推广,建立了三维三次样条插值的一般表达式及其计算过程,给出了三维三次样条插值的反演方法。二维数值模拟是在一维形式化解释的基础上构制二维初始模型,然后计算各测点上的 MT 响应,与实测值拟合,以便求得最佳拟合结果。所谓一维化解释是把剖面上各测点测得的纵向视电阻率ρ_⊥和横向视电阻率ρ_(11)分别按一维模型曲线作解释,求得地电剖面的二维模型和参数。用所述方法对华北地区的 GB 剖面的大地电磁测深资料进行试算,获得了地下导电率分布的基本情况。
There are mainly two methods for the two-dimensional interpretation of MT data: two-dimensional inversion fitting and two-dimensional numerical simulation. Based on the idea of two-dimensional cubic spline rapid inversion method, the author generalizes the three-dimensional cubic spline interpolation and its calculation based on the one-dimensional spline interpolation. The three-dimensional cubic spline Interpolation method of inversion. Two-dimensional numerical simulation is constructed on the basis of one-dimensional formal interpretation of the two-dimensional initial model, and then calculate the MT response at each measurement point, and the measured value fitting in order to obtain the best fit results. The so-called one-dimensional explanation is to interpret the longitudinal apparent resistivity ρ_⊥ and lateral apparent resistivity ρ_ (11) measured at each measuring point in the profile according to the one-dimensional model curve respectively to obtain the two-dimensional model and parameters of the geoelectric profile . By using the above method, the geomagnetic sounding data of GB profile in North China are tentatively calculated, and the basic situation of underground conductivity distribution is obtained.