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首页> 外文期刊>Ground water >Complex Inversion of MRT Signals under Different Loop Configurations for Groundwater Exploration
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Complex Inversion of MRT Signals under Different Loop Configurations for Groundwater Exploration

机译：地下水勘探不同回路配置下的MRT信号复杂反演

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摘要

Surface nuclear magnetic resonance (SNMR) is a relatively new geophysical method for non-invasive groundwater exploration and aquifer characterizatio n. Conventional SNMR surveys based on one-dimensional (1-D) inversion of amplitude data recorded only using coincident loops provide limited or distorted groundwater distribution information, especially in regions with strong lateral heterogeneity and complicated hydrological environments. The simplistic approach limits the applicability and efficiency of SNMR, which was therefore made more effective in this study using a sophisticated signal response formulation. The elliptical polarization parameters of the excitation magnetic fields and 2-D sensitivity kernels (including real and imaginary parts) of three commonly used loop configurations were first calculated. After all the individual complex signals of five simulated measurement series along a profile were incorporated. The 2-D magnetic resonance tomography (MRT) complex inversion scheme was then used to perform high resolution tomography of synthetic models under the three loop configurations, taking full advantage of the different sensitivity distributions offered by the different loop configurations and the high sensitivity of the imaginary parts of signals to deep structures. Contrast analyses of the tomographic results showed that the complex inversions significantly decreased model ambiguities and increased depth resolution even with artificial noise added. Coincident loop measurements usually gave the best vertical resolution, and separated loops provided better lateral resolution. However, various factors would influence phase data, meaning that the complex inversion of field data is neither very reliable nor very common at present.
机译：表面核磁共振（SNMR）是一种相对较新的地球物理方法，用于无创地下水勘探和含水层表征。传统的SNMR测量基于仅使用重合回路记录的振幅数据的一维（1-D）反演，提供的地下水分布信息有限或失真，特别是在横向非均质性强且水文环境复杂的地区。简单的方法限制了SNMR的适用性和效率，因此使用复杂的信号响应公式在本研究中使其更有效。首先计算了三种常用回路配置的激励磁场和2-D灵敏度核（包括实部和虚部）的椭圆极化参数。在沿着轮廓合并了五个模拟测量系列的所有单个复杂信号之后。然后使用二维磁共振层析成像（MRT）复杂反演方案在三种回路配置下对合成模型进行高分辨率层析成像，充分利用了不同回路配置提供的不同灵敏度分布以及传感器的高灵敏度。信号的虚部传递到深层结构。层析成像结果的对比分析表明，即使添加了人工噪声，复杂的反演也显着降低了模型的歧义并提高了深度分辨率。重合环路测量通常可以提供最佳的垂直分辨率，而分离的环路可以提供更好的横向分辨率。但是，各种因素都会影响相位数据，这意味着目前复杂的现场数据反演既不是很可靠也不是很普遍。

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  • 来源
    《Ground water》 |2017年第2期|171-182|共12页
  • 作者

    Chen Bin; Hu Xiangyun; Li Jianhui; Liu Yajun;

  • 作者单位

    China Univ Geosci, Inst Geophys & Geomat, Hubei Subsurface Multiscale Imaging Key Lab, Wuhan 430074, Peoples R China;

    China Univ Geosci, Inst Geophys & Geomat, Hubei Subsurface Multiscale Imaging Key Lab, Wuhan 430074, Peoples R China;

    China Univ Geosci, Inst Geophys & Geomat, Hubei Subsurface Multiscale Imaging Key Lab, Wuhan 430074, Peoples R China;

    China Univ Geosci, Inst Geophys & Geomat, Hubei Subsurface Multiscale Imaging Key Lab, Wuhan 430074, Peoples R China;

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