J4 ›› 2009, Vol. 39 ›› Issue (3): 535-540.

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Numerical Calculation and Analysis on Two-Dimensional Spectrum for Acoustic Wave Propagation in a Borehole

YUE Chong-wang|WANG Zhu-wen,CHEN Bo-tao,DING Yang   

  1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026,China
  • Received:2008-11-04 Online:2009-05-26 Published:2009-05-26

Abstract:

The authors briefly introduced a method to calculate the two-dimensional spectrum of acoustic wave propagation in a borehole and accomplished simulation of the two-dimensional spectrum and got the acoustic pressure waveform. According to the images of two-dimensional spectrum from different formations, it illustrates that the amplitude and dispersion of P-wave and S-wave are weak; Stoneley wave has a low frequency bandwidth and its dispersion is weak, while pseudo-Rayleigh wave has high amplitude with strong dispersion; the leaky mode wave is a kind of geometric attenuation wave and attenuates fast with strong dispersion as well. We can make use of two-dimensional spectrum directly to vividly show the characteristics of the acoustic wave propagation in a borehole.

Key words: borehole, acoustic field, 2D spectrum, acoustic logging

CLC Number: 

  • P631.814
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