Beam orientation principle based suppression method for random noise in seismic single-shot records

A technology of random noise and beam orientation, which is applied in the field of geophysical exploration data processing, can solve problems such as low signal-to-noise ratio, difficulty in distinguishing effective signals from single-shot records, and reduced seismic acquisition efficiency, so as to achieve wide adaptation and improve quality

Inactive Publication Date: 2014-03-12
JILIN UNIV
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Problems solved by technology

In actual seismic exploration, random noise always accompanies the entire acquisition process, and the signal-to-noise ratio of seismic records acquired in areas with strong noise levels is so low that it is difficult to distinguish effective sig

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  • Beam orientation principle based suppression method for random noise in seismic single-shot records
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  • Beam orientation principle based suppression method for random noise in seismic single-shot records

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing and embodiment do further detailed description:

[0026] The use of beam orientation to suppress random noise in single-shot recording is essentially to strengthen the effective signal in the direction of the target and weaken the random noise through the superposition of effective signals and random noise in different time and space.

[0027] A method for suppressing random noise in seismic single shot records based on the principle of beam orientation, including the following steps:

[0028] a. Input one-shot seismic data X, the number of traces is n, copy X data to get X 1 、X 2 、X 3 ,...,X q-2 、X q-1 、X q , q≥2 and is an integer, usually q is an odd number;

[0029] b. Use the delay base τ to delay the 1~q shot data, and the delay parameters are τ 1 , τ 2 , τ 3 ,...,τ k 、…τ q , k=1,2,3,...,q; let τ (k+1) =τ k +τ, then τ (q+1) / 2 = 0, τ q = ...

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Abstract

The invention relates to a beam orientation principle based suppression method for random noise in seismic single-shot records. Different time and space random noise in the single-shot records has randomness, and a beam orientation method is utilized to realize superposition of the random noise in different times and spaces. Strengthening of effective signals and weakening of the random noise are realized. The problem that the effective signals in the single-shot records are difficult to distinguish due to the fact that signal to noise ratio of single-shot random-noise seismic records is low is solved. For original single-shot data, different paths and the same path are different in random noise at different moments but identical in effective signal, and strengthening of signals in the single-shot records and superposition of the random noise in different times and spaces are realized by the aid of the beam orientation principle, so that the random noise in the single-shot records is lowered, the signal to noise ratio of the single-shot records is increased, quality of the original single-shot data is improved, and excellent seismic data are provided for subsequent seismic processing. The method can widely adapt to explosive source and controllable seismic-focus seismic exploration.

Description

Technical field: [0001] The invention relates to a geophysical exploration data processing technology, which is a method for improving the signal-to-noise ratio of seismic data and suppressing random noise in single-shot records. Background technique: [0002] Seismic exploration is one of the important methods for studying underground geological structures and searching for oil and gas resources. In the actual seismic exploration work, random noise always accompanies the entire acquisition process of seismic exploration, which leads to a decrease in the signal-to-noise ratio of seismic data and seriously affects the processing and interpretation of seismic data. Raw seismic data with a high signal-to-noise ratio is conducive to more accurate analysis of the underground medium through processing and interpretation; raw seismic data with a low signal-to-noise ratio not only increases the difficulty of data processing, but also facilitates the understanding of underground stru...

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Application Information

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IPC IPC(8): G01V1/36
Inventor 姜弢贾海青徐学纯林君葛利华杨志超
Owner JILIN UNIV
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