Electromagnetic and seismic streamer cable and method for using such a streamer cable

摘要

A geophysical sensor cable has one or more sensor cable sections. Each of the sensor cable sections is provided with seismic and electromagnetic sensors arranged along said cable. The seismic sensors include a hydrophone and a seismic component receiver for seismic vector measurements while the sensor cable is at the sea-floor. The electromagnetic sensors include both E-field sensors and H-field sensors. The E-field sensors include pairs of first and second electrodes arranged with different positions along the cable and connected to a voltage amplifier. The H-field sensors include three mutually orthogonally arranged H-field component sensors.

主权项

1. A marine geophysical streamer, comprising:
one or more sensor cable sections connected to one another and configured to have adjustable buoyancy enabling said one or more sensor cable sections to be placed stationary on the sea-floor at different survey positions and to be towed between the survey positions during a marine survey; seismic and electromagnetic sensors arranged along said sensor cable sections and configured to detect seismic and electromagnetic waves while said one or more sensor cable sections are placed stationary on the sea-floor; and a lead-in cable having a first end attached to the sensor cable sections and a second end on a continuously moving ship, the lead-in cable being extended while said one or more sensor cable sections are stationary on the sea-floor, and shortened while said one or more cable sections are towed from one of the survey positions to another of the survey positions.