Overshoot on fracture transmission coefficient of borehole Stoneley wave and fracture characteristics

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In this research, we tried to make clear a mechanism of the difference, which was observed between theoretical and measured values in transmission coefficients of borehole Stoneley wave logging. The mechanism was examined by theoretical models, numerical simulation and laboratory experiments. As a result, it was revealed the phase inversion mode of the reflection wave was superimposed on the transmission wave when the Stoneley wave which entered into the fracture returned in the borehole.