(1. 中南大學(xué) 有色金屬成礦預(yù)測教育部重點實驗室，長沙 410083；
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083；3. 長沙五維地科勘察技術(shù)有限責(zé)任公司，長沙 410205)
摘 要: 瞬變電磁法多年以來一直停留在對垂直分量信息的解釋應(yīng)用，對于目前的生產(chǎn)以及復(fù)雜地質(zhì)構(gòu)造勘探等活動而言，不僅信息量少、勘探精度低，而且解釋水平難以提高。本研究用本征電流模型和Galerkin法計算瞬變電磁場，定義具有垂直分量對水平分量比值特征的函數(shù)并以此比值進(jìn)行解釋，最后通過物理模擬進(jìn)行驗證。研究結(jié)果表明：充分利用三分量數(shù)據(jù)不僅避免單分量解釋的局限性，并可簡單、直觀地觀測低阻板狀體體的位置關(guān)系與傾向關(guān)系。
關(guān)鍵字: 瞬變電磁法；磁場三分量；本征電流；低阻板狀體
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
