瞬变响应与视纵向电导解释方法的对比

从＂等效导电平面原理＂出发,研究瞬变电磁过程中层状介质的视纵向电导的计算方法.在正演过程中引入中心差分算法来求取瞬变响应的导数,利用样条插值方法来代替传统意义上的求解反函数的方法来获取关键值-m,通过计算证明该方法可行.最后在验证视纵向电导解释方法有效性的过程中,采用典型的3层H型和4层HK型地电模型分别进行视纵向电导曲线与瞬变响应曲线的对比,计算结果表明,视纵向电导曲线比瞬变响应曲线能够更好地划分电性层,并能很好的指示电性变化关系,从而达到良好的解释效果.

Comparative studies between transient response and apparent longitudinal conductivity interpretation method

According to the principle of equivalent conductive plane,the paper discusses apparent longitudinal conductivity in layered media,uses numerical methods（i.e.central difference algorithm） to calculate the derivative of transient response in forward processing,and adopts spline interpolation method instead of solving the inverse function in the traditional sense in acquiring the key value M to simplify the calculation.When verifying the effectiveness of apparent longitudinal conductivity interpretation,the forward data of typical geoelectric model in H-type Layer 3 and HK-type Layer 4 are used.The results show that the curves of apparent longitudinal conductance can distinguish electrical layers clearly and indicate the magnitude of conductance of layers so as to achieve a good explanation.