Seabed four-component node seismic data acquisition system and data acquisition method thereof

Abstract

The invention relates to a seabed four-component node seismic data acquisition system and a data acquisition method thereof. The system comprises an underwater sound emission source subsurface buoy sunk to the seabed, and a buoy with a GPS or Beidou signal receiving antenna on the sea surface is connected with the seabed underwater sound emission source subsurface buoy through a photoelectric composite cable with a built-in continuous grating fiber; and the top of the seabed four-component node seismic instrument is provided with an underwater acoustic transponder. A sea surface buoy transmits positioning and time service signals to a submarine subsurface buoy through a photoelectric composite cable, and a four-component node seismic instrument arranged on the seabed carries out accurate positioning and time service through underwater sound signals sent by submarine underwater sound emission source subsurface buoys arranged on the periphery of a work area. A composite modulation-demodulation instrument and a continuous grating optical fiber cable built in the sea surface buoy are used for measuring the temperature, pressure, density, salt saturation and other parameters of seawater from the sea surface to the seabed in real time and used for correcting the speed of underwater acoustic signals emitted by the seabed subsurface buoy, and it is ensured that the positioning and time service precision of a seabed node seismic instrument meets the error requirement.

Description

technical field [0001] The invention belongs to the technical field of marine geophysical exploration, and relates to a seabed four-component node seismic data acquisition system and a data acquisition method thereof. Background technique [0002] Marine seismic surveying is a method of conducting seismic surveys on the ocean using survey ships. The principles, instruments used, and data processing methods of marine seismic exploration are basically the same as those of land seismic exploration. Submarine seismic exploration technology is a kind of marine seismic exploration technology, which also consists of seismic sources and acquisition instruments. Most submarine seismic exploration technologies use non-explosive sources (mainly air guns), which float close to the sea surface and are towed by a marine seismic survey ship; the acquisition instruments are placed on the seabed to receive the longitudinal and transverse wave signals emitted by the source and reflected by t...

AI Technical Summary

Problems solved by technology

[0007] In view of the technical problems that the existing seabed node seismic instruments cannot be accurately positioned and the atomic clock is expensive and has timing drift, the present invention provides a seabed four-component node seismic data acquisition system and its data acquisition method, which overcomes the inability of the prior art to Real-time precise positioning and precise timing of submarine node seismic instruments during operation, replacing expensive atomic clock chips that cannot avoid timing drift

Images