Pull-type marine seismic prospecting vertical cable data acquisition system

Abstract

A pull-type marine seismic prospecting vertical cable data acquisition system comprises a working ship carrying an excitation system and a pull-type marine seismic prospecting vertical cable, the vertical cable includes an auxiliary steel cable and a cable part, the cable part includes a front connecting segment, a head working segment, a tail working segment and a tail connecting segment in sequence from top to bottom, a clinometer and a pressure sensor group are arranged between the front connecting segment and the head working segment, the head and tail working segments are provided with eight hydrophone combinations in sequence along a length direction, an extendable eight-channel digital packet is arranged between the head working segment and the tail working segment, and a clinometer and a pressure sensor group are arranged between the tail working segment and the tail connecting segment. Analog-to-digital conversion is realized on a vertical cable, thereby truly realizing digitalization of the cable; the operating depth of water is large, and when the depth of water is 1000m, the vertical cable can still work normally; the time sampling rate is high, the auxiliary steel cable is arranged outside, and reasonable separation of functions is realized; and the prospecting depth is large, and the immersion depth of the vertical cable can be controlled in real time through adjustment of the front connecting segment and the tail connecting segment.

Description

technical field [0001] The invention relates to a data acquisition system used in geophysical exploration, in particular to a towed vertical cable data acquisition system for marine seismic exploration. Background technique [0002] Marine seismic exploration data acquisition system is an important part of marine seismic exploration. At present, domestic marine seismic exploration systems use horizontal cables (HorizonCable) or submarine cables (OceanBottomCable). In recent years, with the advancement of technology, some high-resolution multi-channel horizontal cables have been developed in China. However, due to their proximity to the sea level, the accuracy of the data obtained is low, and their resolution can only meet the needs of medium-deep or shallow layers. The needs of engineering seismic exploration cannot meet the requirements of high-precision seismic exploration. At present, the working water depth of domestic horizontal cables or submarine cables is mostly wi...

AI Technical Summary

Problems solved by technology

[0003] In addition, the foreign vertical cable system is connected with the Ocean Bottom Seismometer (Ocean Bottom Seismometer). There is no vertical cable for independent work, and there is no direct-reading vertical cable for towed exploration by a working ship, which improves the work to a certain extent. cost

And because of its technical monopoly, the construction cost is greatly increased, which cannot meet the actual domestic demand

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