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Several Factors Affecting Cross-Hole Radar Tomography

Ran Limin1,2, Liu Sixin3, Li Yuxi3,4, Li Jianwei2   

  1. 1.Institute of Geophysics and Geomatics, China University of Geoscience, Wuhan430074, China;
    2.Well Logging Company, Northern China Petroleum Bureau, SINOPEC, Xinxiang453700, Henan, China;
    3.College of GeoExploration Science and Technology, Changchun130026, China;
    4.Institute of Electronic, Chinese Academy of Science, Beijing100190, China
  • Received:2012-12-30 Online:2013-09-26 Published:2013-09-26

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Abstract:

Several factors affecting cross-hole radar tomography were discussed by using synthetic data, including the ray coverage angle, the regularization factor k, as well as the measurement configuration. The ray coverage angle was investigated and is found that 40-70 degree is most fitted angle for tomography. If the regularization factor k is too small or too large, the inverted image will differ from model too much. Therefore, the choice of the fitted regularization factor is very important. By studying the horizontal and various oblique anomaly bodies and related wavefield snapshots, it is found that since both the transmitter and the receivers are located in two parallel holes, the rays are mainly along the horizontal direction to propagate, the horizontal anomaly is well imaged, but the vertical or highly angle anomaly cannot be imaged well.

Key words: cross-hole radar, tomography, ray coverage, regularization factor, measurement configuration

CLC Number: 

  • P631.2
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