电性源瞬变电磁短偏移探测方法

薛国强¹，闫 述²，陈卫营¹

(1. 中国科学院 地质与地球物理研究所 矿产资源研究重点实验室，北京 100029；
2. 江苏大学 计算机科学与通信工程学院，镇江 212013)

摘 要：为了解决大深度、高分辨探测地下矿产资源的难点问题,基于近区测深的优越性，提出一种电性源短偏移瞬变电磁装置(SOTEM)，并对该装置下的探测技术进行研究。通过对时间域近场响应特性以及探测深度等面探测能力的分析，认为SOTEM明显优于长偏移瞬变电磁(LOTEM)。接地线源短偏移瞬变电磁法比回线源瞬变电磁法易于施工，且探测深度较大和探测精度相对较高,是一种值得推广的方法。

关键词：电性源；瞬变电磁法；短偏移；全场域；响应

Exploration technique due to grounded wire source with short-offset

XUE Guo-qiang¹, YAN Shu², CHEN Wei-ying¹

(1. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics,
Chinese Academy of Sciences, Beijing 100029, China;
2. School of Computer Science and Telecommunication Engineering, Jiangsu University, Zhenjiang 212013, China)

Abstract:In order to solve the problem of detecting of underground deep ore target with high-resolution, based on the advantage of near field survey, a new configuration named as wire-source with short-offset TEM (SOTEM) was proposed for deep detection and the detecting technique was studied. After analyzing the detection ability of this system, such as time-domain response, as well as detecting depth, the conclusion can be drawn that this kind of configuration has more merit than long-offset TEM(LOTEM). The proposed method is easier to operate and can be used to obtain larger detecting depth and higher detecting accurate. It also shows that SHOTEM is a kind of method worth to be developed.

Key words:grounded wire source; TEM; short-offset; whole field area; response