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Near-surface scattering surface wave removing method

A scattering surface, near-surface technology, applied in the field of exploration geophysics, can solve problems such as poor results, and achieve the effect of improving the signal-to-noise ratio

Inactive Publication Date: 2017-07-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

F-K filtering is a relatively simple basic method of surface wave denoising, but the effect of application in the actual process is not very good, and it is mainly used as a reference value at present.

Method used

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  • Near-surface scattering surface wave removing method

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Embodiment

[0029] Such as Figure 1 to Figure 7 As shown, a method for removing scattered surface waves near the surface includes the following steps:

[0030] S1. Input the seismic record data, analyze the characteristics of the original data, and suppress the surface waves in the seismic record through the matching and tracking time-frequency analysis method to obtain a time-frequency map;

[0031] S2. Determine the area where the surface wave to be suppressed is located in the time-frequency diagram, perform frequency spectrum analysis on the time-frequency diagram, and determine the frequency range corresponding to the surface wave;

[0032] S3. According to a rough distribution area of ​​the surface wave on the time-frequency map of each seismic record, transform the seismic trace into the time-frequency domain, and use the mask function to filter the seismic signal in the time-frequency domain; then filter the filtered The result is inversely transformed and returned to the time d...

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PUM

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Abstract

The invention relates to the technical field of exploration geophysics, and in particular relates to a near-surface scattering surface wave removing method. According to the method provided by the invention, the problem that surface wave noise, direct waves and upstream reflected waves, which are caused by near-surface heterogeneity induction in seismic exploration, are affected by heterogeneous body scattering waves; scattering occurs in the transition from body waves to surface waves and from surface waves to body waves; scattering waves are usually close to or greater than reflection records; surface wave denoising is carried out on actual records by means of a time-frequency analysis technology; scattering surface waves are removed by a direction adjustable filter; and time-frequency analysis and the direction adjustable filter are combined to remove the surface wave information, which can effectively improve the signal to noise ratio of a signal.

Description

technical field [0001] The invention relates to the technical field of exploration geophysics, in particular to a method for removing scattered surface waves near the surface. Background technique [0002] In land exploration, the near-surface often has strong heterogeneity. For example, the surface of the Ordos Basin is complex loess and desert with strong heterogeneity. In the western region, the exploration area extends to complex surfaces such as deserts, gravels, Gobi, mountains, and loess plateaus. The near-surface structure in complex areas will affect the excitation and reception of seismic waves. Surface waves appear in seismic exploration as strong interference waves, which greatly reduce the resolution and signal-to-noise ratio of seismic records. The undulating inhomogeneity near the surface and the internal inhomogeneity will cause the mutual transformation of body wave and surface wave when the seismic wave propagates, and the coherent noise generated will red...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/364G01V2210/324
Inventor 唐杰王浩孙成禹姚振岸
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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