CSAMT全区视电阻率电场正演迭代拟合近场校正方法

THE CSAMT NEAR-FIELD CORRECTION METHOD FOR ELECTRIC FIELD APPRARENT RESISTIVITY FORWARD ITERATIVE FITTING

利用水平电偶源激发的电磁场,提出了正演迭代拟合电场强度的CSAMT近场校正方法。实验应用表明,在远区该方法的结果等于卡尼亚电阻率,在近区和过渡区则明显改善了卡尼亚电阻率的非波区场畸变。使用该方法能扩大CSAMT的勘探深度,扩展应用领域,更形象地反映地下介质的垂向电性的变化。

Using the electromagnetic field stimulated by the horizontal electric dipole, this paper proposes the method of CSAMT near- field correction. According to the experiments, the result of this method is equivalent to that of the Cagniard resistivity in the distant area ; nevertheless, the utilization of this method can obviously improve the distortion of the Cagniard resistivity in the near and transitional area. Therefore, this method will increase the depth of CSAMT exploration, extend the application field and reflect the changes of the vertical subsurface electric vividly.