Sea combined controled vibrator short time subsection scanning method

A scanning method and seismic source technology, applied in seismic signal receivers, seismology in areas covered by water, etc., can solve problems such as the difficulty in realizing fixed-point working methods and the inability to directly use marine electromagnetic vibroseis, and achieve The effect of meeting requirements, reducing adverse effects, and improving signal-to-noise ratio

Inactive Publication Date: 2008-08-27
JILIN UNIV
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Problems solved by technology

At present, the fixed-point working method used by marine electromagnetic vibrator is difficult to realize, and linear scanning, joint scanning and code scanning are proposed for land elect

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  • Sea combined controled vibrator short time subsection scanning method
  • Sea combined controled vibrator short time subsection scanning method
  • Sea combined controled vibrator short time subsection scanning method

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[0019] The following is a further detailed description with reference to the drawings and embodiments:

[0020] The short-time segmented scanning method of marine combined vibroseis includes the following sequence and steps:

[0021] a. Three or more controllable seismic source exciters are sealed and distributed on the same steel frame at equal distances and fixed with bolts to form a controllable seismic source array. The controllable seismic source array is connected to the source controller through a cable connection;

[0022] b. Put the array of controllable seismic source exciters into the sea, so that the array of controllable seismic source exciters is fully coupled with the seawater;

[0023] c. Calculate the source code S(t) according to the target layer. After relevant judgments, if it does not meet the requirements of seismic exploration, recalculate the source code S(t). If it meets the requirements of seismic exploration, send the source code to the controllable seis...

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Abstract

The invention relates to a method of scanning in short time and by sections with a combined sea controllable vibroseis, comprising the following steps of: placing a sealed controllable vibroseis array in the sea to enable vibration exciters of the controllable virboseis to be coupled with the sea water completely; computing source code (S(t)) according to a target zone, dividing a Chirp signal with a set frequency interval into N sections, controlling the frequency sections of scanning signals of the N controllable vibroseises to enable the N controllable vibroseises to complete the scanning of different long frequency sections in short time, performing related processing to reflected signals received by a collecting system and obtaining a seismic profile with a conventional seismic processing software. The method of scanning the sea in a short time and by sections with a combined controllable vibrosei solves the problem of low resolution in sea seismic exploration due to the effect of the seismic exploration carrier, improves the Signal to Noise Ratio so that the effect of the seismic exploration carrier to the seismic exploration is reduced to the most lowest point, realizes the seismic exploration of high resolution at shallow layer of the sea and also solves the problem that only fixed point scanning can be adopted on the prior sea controllable vibrosers and the movement of the seismic exploration carrier affects the resolution of the seismic exploration during the sea seismic exploration.

Description

Technical field: [0001] The invention relates to a scanning method for marine shallow artificial seismic exploration, in particular to marine seismic exploration in which multiple vibrator sources work simultaneously. Background technique: [0002] The marine electromagnetic vibrator is a new type of vibrator developed to overcome the defects of the airgun vibrator and the electric spark source. Since 1967, the organic combination of seismic exploration and sonar technology has been carried out on the marine vibroseis. The electromagnetic marine vibrator uses 2 shocks as a group to complete the scanning of the 6-100Hz frequency range, one of which works in the 6-20Hz frequency band, and the other works in the 20-100Hz frequency band. Within the working frequency range, the output of the maximum exciting force is guaranteed. However, the limitation of this type of seismic source is reflected in its fixed-point working method. It is difficult to make corresponding records aft...

Claims

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Application Information

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IPC IPC(8): G01V1/20G01V1/38
Inventor 陈祖斌林君张林行孙锋
Owner JILIN UNIV
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