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Deep downhole testing: Procedures and analysis for high-resolution vertical seismic profiling.

机译：深井下测试：高分辨率垂直地震剖面的程序和分析。

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摘要

A study was undertaken to improve the signal quality and the resolution of the velocity profile for deep downhole seismic testing. Deep downhole testing is defined in this research as measurements below 225 m (750 ft). The study demonstrated that current testing procedures can be improved to result in higher signal quality by customizing the excitation frequency of the vibrator to local site conditions of the vibrator-earth system. The earth condition beneath the base plate can be an important factor in the signal quality subject to variations with time when tests are repetitive. This work proposes a convenient method to measure the site localized natural frequency and damping ratio, and recommends using different excitation frequencies for P- and S-wave generation. Properly increasing the excitation duration of the source signal also contributes to the quality of the receiver signal.;The source signature of sinusoidal vibratory source is identified. Conventional travel time analysis using vibratory source generally focuses on chirp sweeps. After testing with impulsive sources and chirp sweeps and comparing the results with the durational sinusoidal source, the sinusoidal source was then chosen. This work develops an approach to identifying the source signature of the sinusoidal source and concludes that the normalized source signature is relevant only to four parameters: the fixed-sine excitation frequency, the duration of excitation, the damping ratio of the vibrator-earth system, and the damped natural frequency of the vibrator-earth system. Two of the parameters are designated input to the vibrator and the other two parameters are measured in the field test using the proposed method in this work.;A new wavelet-response technique based on deconvolution and consideration of velocity dispersion is explored in travel-time analyses. The wavelet-response technique is also used for development of a new approach to correcting disorientation of receiver tool. The improved downhole procedures and analyses are then used in the analysis of deep downhole test data obtained at Hanford, WA. Downhole testing was performed to a depth of about 420 m (1400 ft) at Hanford site. Improvements in resolving the wave velocity profiles to depths below 300 m (1000) ft are clearly shown.
机译：进行了一项研究，以改善深井下地震测试的信号质量和速度剖面的分辨率。这项研究将深层井下测试定义为在225 m（750 ft）以下的测量。该研究表明，通过根据振动器-接地系统的局部现场条件定制振动器的激励频率，可以改善当前的测试程序，以提高信号质量。重复测试时，底板下方的接地条件可能是信号质量随时间变化的重要因素。这项工作提出了一种方便的方法来测量现场局部固有频率和阻尼比，并建议使用不同的激励频率来产生P波和S波。适当增加源信号的激励持续时间也有助于提高接收器信号的质量。识别正弦振动源的源特征。使用振动源的常规行进时间分析通常集中在chi扫描上。在使用脉冲源和chi扫描进行测试并将结果与​​持续正弦波源进行比较之后，便选择了正弦波源。这项工作提出了一种识别正弦波信号源特征的方法，并得出结论，归一化的信号源特征仅与四个参数有关：固定正弦激励频率，激励持续时间，振动器-接地系统的阻尼比，以及振动器-接地系统的阻尼固有频率。在这项工作中，使用所提出的方法将其中两个参数指定为振动器的输入，并在野外测试中对另外两个参数进行了测量。；探索了一种基于去卷积并考虑速度分散性的新的小波响应技术分析。小波响应技术还用于开发一种新的方法来校正接收器工具的方向偏差。然后，将改进的井下程序和分析用于分析在华盛顿州汉福德获得的深层井下测试数据。在汉福德工地进行了约420 m（1400 ft）深度的井下测试。清楚地显示了将波速剖面解析到300 m（1000）ft以下深度的改进。

著录项

  • 作者

    Li, Songcheng.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 310 p.
  • 总页数 310
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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