Acoustoelectric logging is an unconventional well-logging method based on the seismoelectric coupling effect in rocks. The acoustoelectric logging tool (AELT) developed by our team was tested in a well located at Eastern China. We received acoustic–acoustic and acoustic–electric synchronization signals via an acoustic and electric synchronous acquisition system. Theoretically expected accompany- and interface-mode acoustoelectric signals could be observed in the measured signals. Preliminary results show that the waveform composition and frequency characteristic of accompany-mode acoustoelectric and acoustic–acoustic signals are similar. Over the entire measured well section, the energy values of acoustic P/S-waves and the accompany-mode acoustoelectric signals emitted by this wave are relatively weak, whereas the energy values of the acoustic Stoneley wave and the accompany-mode acoustoelectric signals emitted by this wave are relatively strong. A high correlation exists between the energy of the acoustic–acoustic and acoustoelectric signals in the entire measured well section. The arrival time of interface-mode acoustoelectric signals is not changed by the variation in offset and formation acoustic velocity. The energy of interface-mode is related to conventional well-logging data. Certain features of the seismoelectric transition effect are related to the permeability and porosity of a formation, and thus, AELT can potentially provide a new solution for estimating formation parameters.