中文摘要：

在CSAMT的野外工作中,需考虑收发距影响,确保在远区采集数据.然而通过估计大地平均电阻率计算收发距准确度较差,需提出其他方法改进估计合适收发距的准确度.本文提出利用工区的音频大地电磁资料构建1D模型用于计算最小收发距,具体过程为：首先利用AMT数据进行一维反演,反演计算出一个层状地电模型;根据Bostick转换求取达到目的层勘探深度对应的最小频率;在此1D模型基础上进行赤道装置方式的CSAMT正演计算和MT正演计算,通过对比两者视电阻率误差,找出满足远区条件的最小收发距.通过理论数据模拟,展示了此方法的可行性,为CSAMT最小收发距估算提供了一种新思路.

英文摘要：

In the field work of CSAMT,the data acquisition must be processed in the far zone. However, the accuracy of the separation between receiver and transmitter of CSAMT by estimating the earth resistivity is poor. In this paper,we propose a new method to calculate the minimum separation between receiver and transmitter by using the AMT data to build 1D model. Specific process as follow： first,using of AMT data to build a 1D model.Then,the minimum frequency that can explore the target depth was calculated by using the Bostick switch; CSAMT forward calculation and MT forward calculation were down In the 1D model based on the equator device. By comparing error of the kinds of apparent resistivity,the minimum separation between receiver and transmitter was fond out. The feasibility of this method was demonstrated through the theoretical data simulation. And a new idea about distance estimation of the minimum separation between receiver and transmitter was provided.