Cable Head Marine Seismic Source

摘要

Method for obtaining zero offset or near zero offset data in a marine seismic streamer survey. An acoustic transmitter (41) is attached to one of the buoys (14 or 16) that provide flotation to each streamer (12) and tow umbilical (13). The acoustic transmitters, or single transmitter in the case of a 2-D survey, may be fired (71-73) before each shot from the survey air guns. The response to the acoustic transmitters recorded by the near sensors in each streamer, or by a water break sensor if provided, will be a near-zero to zero-offset record of the shallow subsurface below the water bottom.

主权项

1. A method for acquiring near zero-offset seismic data in a marine streamer seismic survey with at least one seismic source and one or more streamers, each streamer attached to at least one buoy to provide flotation, said method comprising:
placing an acoustic transmitter at one buoy on at least one of the streamers, wherein each acoustic transmitter transmits an acoustic signal strong enough to penetrate beneath the water bottom at least 300 m into the subsurface; firing the at least one acoustic transmitter; and obtaining near zero-offset data from one or more streamer sensors nearest the at least one acoustic transmitter.