文章摘要
王庆乙.广域电磁法近区高分辨率的研究[J].矿产勘查,2022,13(9):1318-1321
广域电磁法近区高分辨率的研究
Study on high resolution near wide field electromagnetic method
投稿时间:2021-11-17  
DOI:10.20008/j.kckc.202209009
中文关键词: 广域电磁法  近区  高分辨率
英文关键词: WFEM  near region  high resolution
基金项目:
作者单位
王庆乙 北京矿产地质研究院, 北京 100012
中色杰泰地球物理科技北京有限公司, 北京 100012 
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中文摘要:
      广域电磁法与其他人工场源电磁法相比较,其显著特点是近区分辨率反常的低于远区分辨率。本文对此进行了研究,是由于其感应测深的幅值受几何测深幅值控制所致。本文进一步对广域电磁法近区高分辨率的探讨,研究了近区电场虚分量多项式的作用,发现电场虚分量第三项具有高分辨率因子的存在。据此,推导出广域电磁法近区高分辨率的解析表达式。本文的结果,可使广域电磁法无需广域探测,只需在近区探测,不仅施工方便、合理和信噪比高,而且能比远区和过渡区获得更大的探测深度,更精细的分层能力,以此更灵敏发现良导金属矿体。
英文摘要:
      The wide field electromagnetic method (WFEM) is characterized by one of the features of the abnormalities of lower near region resolution lower than far region resolution, compared with other field source electromagnetic methods. In this paper, it is concluded that the amplitude of induction sounding is controlled by the amplitude of geometric sounding. In addition, we further discuss the near region resolution of electromagnetic method, and study the function of polynomial of virtual component of electric field in near region, and find that the third term of the imaginary component of the electric field affects the high resolution factor. Therefore, the analytical expression of high resolution in the near region of WFEM is deduced. The results of this paper can apply the WFEM method into the near area detection, with the convenience and reasonableness of construction and good signal-to-noise ratio, but also it can obtain greater detection depth than that of the far area and transition area and posses the ability of more fine stratification, leading to the sensitivity of detecting the well-guided metal ore bodies.
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