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Three-component directional correction method of submarine node seismograph

A correction method, three-component technology, applied in seismology, geophysical measurement, seismic signal processing, etc., can solve problems such as limitations and insufficient accuracy

Active Publication Date: 2020-01-14
CHANGAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a three-component directional correction method for a seabed node seismograph in view of the deficiencies in the above-mentioned prior art. The method is simple in steps and reasonable in design. It can solve the problem of insufficient precision and limitations of three-component redirection using direct waves, and has strong practicability

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  • Three-component directional correction method of submarine node seismograph
  • Three-component directional correction method of submarine node seismograph
  • Three-component directional correction method of submarine node seismograph

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Embodiment Construction

[0071] Such as figure 1 A three-component orientation correction method for a seabed node seismometer shown, comprising the following steps:

[0072] Step 1. Layout of shot points and seabed nodes and acquisition of seismic wave data:

[0073] Step 101, setting multiple shot points on the sea surface, and using the source ship to excite seismic waves to the seabed at each shot point; wherein, the number of shot points is n trace one, n trace shot points are located on the same straight line, n trace The shot points are marked as the first shot point, the second shot point, ..., the h-th shot point, ..., the n-th shot point from front to back according to the running direction of the source ship trace shots, j′ and n trace is a positive integer, and n trace ≥3, 1≤h≤n trace ;

[0074] Step 102, laying out multiple seabed nodes on the seabed, the location of each seabed node is called a detection point; wherein, the number of seabed nodes and detection points is n, and n s...

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Abstract

The invention discloses a three-component directional correction method of a submarine node seismograph. The method comprises the following steps: (1) arranging a shot point and a submarine node, andcollecting seismic wave data; (2) obtaining a covariance matrix of a preliminary wave; (3) converting the covariance matrix of the preliminary wave, and obtaining a polarization vector of the preliminary wave; (4) obtaining a correction rotating angle; and (5) collecting the seismic wave data collected by the submarine node. According to the three-component directional correction method disclosedby the invention, the three-component directional correction is performed by using the polarization characteristics of the refracted waves, and the problems of insufficient accuracy and limitation ofthree-component redirection by using direct waves can be solved.

Description

technical field [0001] The invention belongs to the technical field of correction of seismic wave data collected by seabed nodes, and in particular relates to a three-component orientation correction method of a seabed node seismometer. Background technique [0002] The current marine seismic exploration method is ocean bottom node exploration (OBN), which directly places the ocean bottom node, that is, the geophone on the seabed, which not only makes the observation system layout more flexible, but also better meets the exploration needs of all-round, high-density, and large offset distances. , and can receive shear waves and longitudinal waves, realize four-component acquisition, make seismic records contain more abundant information, and provide a basis for converted wave imaging, fracture determination, reservoir inversion, etc. [0003] However, in the exploration of submarine nodes, after the submarine nodes are placed on the seabed by direct delivery or underwater rob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/38G01V1/28G01V13/00
CPCG01V1/28G01V1/3808G01V1/3817G01V13/00
Inventor 闫凯鑫李庆春
Owner CHANGAN UNIV
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