Surface wave modes in a water-filled borehole surrounded by a poroelastic medium are studied. Numerical and experimental results are presented for the dispersion relation of shock-induced surface waves in a borehole in a confined formation in a broad band of frequencies (1-50 kHz). Theoretically, it is shown that permeability affects considerably both the phase velocity and damping coefficient of the pseudo-Stoneley wave. Experimentally, a vertical shock tube is used to excite pseudo-Stonele and pseudo-Rayleigh waves as wel as the bulk compressional wave. Qualitative agreement between experiment and theory is obtained.
|Title of host publication||Proceedings of the 24th International Symposium in Shock Waves, 11-16 July 2004, Beijing, China|
|Place of Publication||Berlin|
|Publication status||Published - 2005|