SEGJ Technical Conference

Development of low frequency acoustic transducer for the submarine natural resources and their filed test at the shallow water bottom

Abstract We have been developing some portable acoustic transducers for a mobile and accurate exploration and monitoring of time lapse sub-ocean bottom reservoirs such as oil, gas and MH reservoirs. In this study, we report new broadband acoustic portable transducers which have larger power than the original cylindrical acoustic transducers (ITC-2003) in a lower frequency range than 5kHz funded by JOGMEC. The preliminary results of their experiment at the shallow sea bottom suggest that (i) it is successful to broaden the frequency bandwidth (i.e., 2k~10kHz) by extending a geometrical resonance length of a cylindrical acoustic transducers, and (ii) the observation at the sea bottom with accurately controlled timing systems of transmitter and data-logger is very useful to identify the stable and/or unstable seismic phases, that is, waves propagating in a underground and/or in a sea water.