Application of audio magnetotelluric method to find water in the red beds of the Fangshiping village, Huaihua City

In order to find water in the red beds of the Fangshiping village, Huaihua City, the audio magnetotelluric method was used to conduct water application research. The results of the study indicate that， (1)The audio magnetotelluric method is an effective geophysical method in the red beds. It is to comprehensively use the electrical characteristics and magnetic characteristics of the rock to distinguish the anomaly. Although the resistivity value of red beds is low, and the electrical difference is small, it has a relatively small influence on them by this method. (2)The results of data processing can better indicate the characteristics and position of the abnormity. The inference results are basically consistent with the drilling verification results and the maximum water inflow is 82.94 m3· d-1 . (3) The apparent resistivity sounding curve ρs in the drilling can effectively evaluate the electrical structure of underground. Its K curve can effectively enlarge the slight change of curve ρs to highlight the abnormity. Therefore, it can effectively mark the specific depth and the stratified position of the abnormal under the ground in the red beds, and the stratified results are basically consistent with the drilling results.