Review on the study of grounded-source transient electromagnetic method
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摘要: 电性源瞬变电磁法(TEM)具有探测深度大、受地形限制小、工作效率高等优点,近些年发展较快,涌现出一系列面向地面、半航空、地—井的电性源瞬变电磁新方法。本文通过回顾近些年国内外出现的新方法,即长偏移距瞬变电磁法(LOTEM)、短偏移距瞬变电磁法(SOTEM)、多通道瞬变电磁法(MTEM)、电性源半航空瞬变电磁法和电性源地—井瞬变电磁法的研究历史,总结各类方法在正演模拟、系统设计、反演成像和施工方法等方面的研究现状。研究结果表明:LOTEM研究基础丰厚,发展全面,是一种比较成熟的电性源TEM方法;而其他电性源TEM方法虽然取得了一些研究进展,但整体仍处在初步研究阶段,相关技术仍有待进一步提升;LOTEM中有价值的研究内容,如提高数据信噪比、高维反演和联合解释等,可为这些电磁勘探新技术提供借鉴,以期为高效率、高分辨率深部探测提供更多解决方案。Abstract: Grounded-source transient electromagnetic method (TEM) has many advantages such as deep exploration, flexible arrangement in rough terrain and high working efficiency. Recently it has got much attention and a series of new methods are available, ranging from surface to airborne and borehole method. In this paper, the authors review the research history of long-offset TEM (LOTEM), short-offset TEM (SOTEM), multi-channel TEM(MTEM), grounded-source semi-airborne TEM and grounded-source surface to borehole TEM, and summarize their research status in forward modeling, system design, inversion, imaging and field working. The results show that, as a well-developed grounded-source TEM, LOTEM has accumulated many research achievements. Although some progress has been made, the researches on other grounded-source TEMs are still in a primary stage and still need further improvement. Valuable research results in LOTEM, for example, noise suppression technology, high dimensional inversion and point interpretation, can be introduced to these newly developed electromagnetic methods, which can help provide solutions for high working efficiency and high resolution deep exploration.
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Key words:
- grounded-source /
- transient electromagnetic method /
- deep exploration /
- offset /
- multi-channel /
- semi-airborne /
- surface to borehole
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