A novel marine seismic-electromagnetic joint acquisition station

In recent years, marine geophysical techniques such as marine seismic survey, sea-floor controlledsource electromagnetic (CSEM), marine magnetotelluric (MMT), and marine gravity survey have developed rapidly, resulting in various underwater devices have been developed for detecting different target fields. Meanwhile, since joint observation and inversion of multiple ocean physical fields has become a popular research topic, it is necessary to develop the corresponding integrated underwater observation devices. Considering that the single-function seabed acquisition instruments cannot effectively meet the requirements of marine multi geophysical joint exploration, we developed the OBMIX marine seismic-electromagnetic joint acquisition station, which integrates the functions of seabed observation equipment such as OBS and OBEM, to synchronously collect underwater seismic and electromagnetic signals. By utilizing the joint exploration and inversion of seismic, electromagnetic, and geomagnetic data, we can improve exploration efficiency and inversion accuracy. Two prototypes of the instrument have been installed in 2022. By now, we have completed indoor and offshore testing of the two prototypes, and the test results meet R&D expectations. According to the research plan, the deep-sea testing is also on schedule.