复杂地形条件下频率测深资料解释

采用比值法对视电阻率数据进行处理,沿电磁波传播方向作视电阻率比值断面等值线图的方法来消除起伏地形的影响,进行定性和半定量解释.阐述了确定电磁波传播方向的两种方法,即采用二维涡流有限元方程计算断面电磁场强度分布的方法和采用导电纸模拟实验测定稳定电流场中等位线的近似方法.并在贵州某地试验剖面上实际应用该方法进行解释,证明了方法的有效性.

DISCUSSION OF FREQUENCY SOUNDING DATA INTERPRETATION IN TERRAIN AREAS

In this paper ,a method to constrain topographic effects and interpret frequency sounding data qualitatively and semi-quantitatively is presented. This method calculates apparent resistivity ratio and locates these ratio data in contour map according to the propagation direction of electromagnetic waves. Two methods determining the propagation direction of electromagnetic waves are presented. One decides the distribution of two-dimensional electromangetic field by using limit element eguation. Another one determines the equal-potential faces of corresponding static electric field as the approximate propagation direction of electromagnetic waves by model experiment. A field case of sections in Guizhou was presented and the validity of the method was demonstrated.