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应用CSAMT方法进行标量测量时,一般要求测线沿垂直构造走向的方向布测.在实际测量的时候由于地表条件复杂经常出现无法判断地下构造走向的情况,例如,在长白山地区进行CSAMT测量,由于表面覆盖有玄武岩无法判断地下构造走向,对得到的标量数据进行一维、二维反演处理时无法判断哪种反演方式的结果更准确.鉴于此,建立三维地质模型,应用CSAMT三维正演程序进行数值模拟.研究测线与构造走向平行,呈45°及垂直三种情况下的一维、二维反演,对结果做比较分析.实验结果表明,测线平行构造走向时,一维、二维反演结果近似;测线与构造走向呈45°或垂直时,二维反演结果比一维反演结果对异常体的形状,大小,埋深及电性参数反演的更准确.
When CSAMT method is used for scalar measurement, it is generally required that the survey line be laid along the direction of the vertical structure direction. In the actual survey, due to the complicated surface conditions, it is often impossible to judge the direction of the subsurface structure. For example, CSAMT survey in Changbai Mountain area, Therefore, it is impossible to judge which inversion method is more accurate when the scalar data is subjected to one-dimensional and two-dimensional inversion. In view of this, a three-dimensional geological model is established and applied to CSAMT three-dimensional forward modeling The numerical simulation is carried out.The results are compared with the one-dimensional and two-dimensional inversions at 45 ° and vertical.The results show that when the line is parallel to the structure, the one-dimensional , And the two-dimensional inversion results are approximate. When the survey line and tectonic strike are at 45 ° or vertical, the 2D inversion results are more accurate than the one-dimensional inversion results in retrieving the shape, size, depth and electrical parameters of the anomalous body .