固定源建场测深在地形复杂区的勘探试验研究

PROSPECTING TEST STUDY ON ELECTROMAGNETIC SOUNDING FOR FIXED EXCITATED SOURCE IN VARIED TOPOGRAPHY AREA

固定源建场测深是一种时间域电磁测深方法 ,其具资料信噪比高、数据精度高、可避免地表电性不均匀引起的静态位移等优点。但用线圈作为磁探头的传统方法只能适用于地形平坦区 ,在地形复杂的勘探高难地区无法应用。采用磁棒代替线圈作磁探头 ,进行了固定源建场测深在地形复杂区的勘探试验。结果表明 ,改进后的固定源建场测深能适用于地形复杂区的勘探 。

Electromagnetic sounding of fixed excitated source is a time-domain electromagnetic sounding method, which has many advantages such as high ratio of signal to noise, high precision of data, without static migration. But traditional method used coils as magnetic detector is only applicable to smooth terrain area and can not be applied to varied topography area. This paper expounds the prospecting test study on electromagnetic sounding of fixed excitated source used magnetic stick as magnetic detector in varied topography area. The results of study indicate that this method can be applied to varied topography area when magnetic stick as magnetic detector and its geological results can make up the deficiency of seismic prospecting data.