音频大地电磁法在怀化方石坪村红层找水中的应用研究
Application of audio magnetotelluric method to find water in the red beds of the Fangshiping village, Huaihua City
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摘要: 文章采用音频大地电磁法，在怀化方石坪村红层进行找水应用研究。结果表明：（1）音频大地电磁法在该红层区是一种有效的物探方法，虽然该红层区电阻率值低，电性差异小，但音频大地电磁法是综合利用岩土层（体）的电性特征和磁性特征来分辨异常，电性差异对其影响相对较小；（2）数据处理的结果能很好地指示出异常特征和比较具体的异常位置，推断结果与钻井验证结果基本一致，最大涌水量为82.94 m3·d-1 ；（3）钻孔处视电阻率测深曲线ρs能有效地对地下电性结构进行评价，其K曲线将ρs 曲线中的微弱变化进行放大，突出异常，标示该红层区地下异常比较具体的深度和分层位置，分层结果与钻孔结果基本一致。Abstract: 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.
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