DEVICE AND METHOD FOR TRANSMITTING ACOUSTIC WAVE INTO UNDERGROUND, FOR RECEIVING THE ACOUSTIC WAVE, AND UNDERGROUND EXPLORATION METHOD USING ABOVE MENTIONED DEVICE

摘要

On the transmitting side, a piezoelectric device (34) is so provided that thetransmission direction is vertical to the wall of an exploration well (12). Ananvil (42) provided on the exploration hole wall side of the piezoelectricdevice is pressed against the wall of the investigation well by a clampingmechanism (64). On the receiving side, the upper and lower parts of anexploration well (112) are closed with a packer (182) and a shut-off valve(180) to block the flow of fluid, and a cable (150) above a receiver is fixedto the wall of the exploration well by a clamping mechanism (164) to reducenoise propagated through the cable. The measured depth and the distancebetween the exploration wells in oil exploration and soil survey usingacoustic tomography can be increased and the applicable range can be widened.