| 摘要 |
A seismic survey system for in-sea use comprises at least one winch 2 mounted onto a tow vessel, a winch line coupled to a floated drag device 8 and a calibrated line counter on the winch for accurate pay in and out readings, the floated drag device being coupled to a separation rope of a seismic source array. The position of the seismic source array relative to the tow vessel centre line may be controlled. The system may further comprise winches mounted on the vessel comprising winch lines coupled to floated drag devices attached to streamer (10, figure 4) separation ropes (11). The system may be used for conducting 4D seismic surveys. |
