Near-bottom dragging type random receiving cable earthquake data collection system and method

Abstract

The invention discloses a near-bottom dragging type random receiving cable earthquake data collection system and method. The system comprises a laboratory control table, a dragging framework and a dragging cable. The collection method comprises five steps including system configuration, system distribution, data collection, system recovery and data processing. The system and the method use the technical scheme of arranging hydrophones on a receiving path in random positions; the functions of reducing the effective path space, improving the transverse resolution ratio and efficiently performingcollection are realized; the design of combining and connecting a plurality of sub sections is used, so that the system combination and expansion are conveniently and flexibly completed; and high adaptation capability is realized on an observation object.

Description

technical field [0001] The invention relates to the field of marine geophysical detection, in particular to a near-bottom towed random receiving cable seismic data acquisition system and method. Background technique [0002] Marine geology and mineral resources survey is a basic and strategic survey activity, in which seismic detection methods play an important role in seabed structure and mineral resources survey. Conventional sea surface towed seismic is far away from the seabed, the data signal-to-noise ratio is low, and the horizontal resolution is insufficient. It is generally difficult to apply to high-resolution seismic exploration (such as natural gas hydrate, sulfide and other resource exploration, etc.). [0003] In recent years, a variety of near-bottom towed seismic acquisition systems have been developed at home and abroad, such as DTAGS of the US Naval Research Laboratory, SYSIF of the French Ocean Development Research Institute, etc., which have played an impo...

AI Technical Summary

Problems solved by technology

[0004] Deep sea towing has high requirements on the pressure resistance performance of seismic cables and the overall operation mode. Deep sea hydrophones (especially those that can be used at 3000-6000m operating depth) have high technical requirements, large demand, and high cost. The cost of cables is very expensive, and the cost of seismic operations is also high

In view of the great difficulty of towing cables near the seabed, how to reduce the development cost of deep-sea towing cables (that is, use a certain number of hydrophones to increase the cable length as much as possible), and improve the data receiving capability (that is, further improve the data reception under the premise of a certain cable length) resolution) and operational flexibility (that is, adjusting the cable towing position for different targets) is an important challenge for the current deep-sea towed seismic equipment

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