P097 Tube-Wave Reflections in Cased Boreholes D. Alexandrov (St.-Petersburg State University) B.M. Kashtan (St.- Petersburg State University) A.V. Bakulin (Shell International Exploration and Production Inc) & S.R. Ziatdinov* (St.-Petersburg State University) SUMMARY At low frequencies tube or Stoneley waves represent a dominant arrival propagating along boreholes. They can be excited by the source in a well or by external source due to conversion from other wave types. Tube wave experiences reflection at the bed boundaries borehole diameter changes and fractures or permeable zones. It was proven in previous studies that 1D effective wavenumber approach provides simple and accurate low-frequency description


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