(1. 中南大学 有色金属成矿预测教育部重点实验室，长沙 410083；
2. 中南大学 地球科学与信息物理学院，长沙 410083；3. 长沙五维地科勘察技术有限责任公司，长沙 410205)
摘 要: 瞬变电磁法多年以来一直停留在对垂直分量信息的解释应用，对于目前的生产以及复杂地质构造勘探等活动而言，不仅信息量少、勘探精度低，而且解释水平难以提高。本研究用本征电流模型和Galerkin法计算瞬变电磁场，定义具有垂直分量对水平分量比值特征的函数并以此比值进行解释，最后通过物理模拟进行验证。研究结果表明：充分利用三分量数据不仅避免单分量解释的局限性，并可简单、直观地观测低阻板状体体的位置关系与倾向关系。
关键字: 瞬变电磁法；磁场三分量；本征电流；低阻板状体
transient electromagnetic method
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083;
3. Changsha 5D Geo-survey & Technical Co., Ltd., Changsha 410205, China）
Abstract:The transient electromagnetic method was only used to interpret vertical component for a long time. And for this reason, there exist some problems, such as information deficiency, low exploration precision and inadequate explaining ability in productive activities and exploration. Therefore, this work calculates the transient electromagnetic field by using eigencurrent model and Galerkin method, and defines a function to get the ratio of the vertical component and horizontal component and gives explanations based on the ratio. In the mean time, the relevant physical simulation experiments were carried out. The results show that the deficiency of single-component explanation can be avoided by fully using three components in explanations through this method, and the position and tendency of the low-resistance plane can be simply judged.
Key words: transient electromagnetic method; three-components; eigencurrent; low-resistance plane
