Qiu Chang-Chun et al 2009 Chinese Phys. Lett. 26 114301 doi:10.1088/0256-307X/26/11/114301
Qiu Chang-Chun1, Zhang Bi-Xing1, Zhang Yu-Jun2 and Cui Zhi-Wen2
Show affiliationsTheoretical and numerical study on the coupling acoustic field of the plane p-wave to a cased borehole is carried out. The medium outside the cased borehole is modeled as the porous medium. The scattering field characteristics in the cased borehole are investigated when a plane fast p-wave is incident in tilt to the cased borehole from the porous medium. The scattering fields inside and outside the cased borehole are analyzed and deduced by Biot's theory under the boundary conditions on each interface, and they are numerically studied. It is found that the scattering field has strong resonant characteristics and there exists a series of resonant frequencies and peaks. The effects of the frequency, radii of each interface, incident angle, porosity, and other parameters on the resonant acoustic field have been investigated in detail in the fast and slow formations respectively. The resonant characteristics of the scattering field are also analyzed from the physical sense.
43.20.Bi Mathematical theory of wave propagation
43.20.El Reflection, refraction, diffraction of acoustic waves
Issue 11 (November 2009)
Received 11 May 2009
Qiu Chang-Chun et al 2009 Chinese Phys. Lett. 26 114301
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