Abstract: The excited acoustic spectroscopy (EAS) in cased calibration hole is calculated with the realaxis integral method. The effect on acoustic field in the hole from varied bondedconditions at the first and second interface and the thickness of the modeling formation is analyzed. The numerical results show that the effect of the outmost boundary of the formation on the EAS in the hole decreases with the increase of the formation thickness or with the deterioration of the two bonded interfaces. At low frequencies(less than 3 kHz), the outmost formationboundary have little effect on the EAS, when the radius of this boundary is great than 0.2 m, while effect from the two bonded interfaces can be ignored. In order to decrease the effect on the acoustic field from the artificial formation boundary in the calibration hole, not only the thickness of the modeling formation under different bonded conditions but also the measuring frequency of the source should be considered carefully when the authors design a cased calibration hole.

Key words: cementation, cased calibration hole, excited acoustic spectroscopy