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A Method for Removing Near-Surface Scattered Surface Waves

A scattering surface and 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: 2019-02-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
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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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  • A Method for Removing Near-Surface Scattered Surface Waves
  • A Method for Removing Near-Surface Scattered Surface Waves
  • A Method for Removing Near-Surface Scattered Surface Waves

Examples

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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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Abstract

The present invention relates to the technical field of exploration geophysics, in particular to a method for removing scattered surface waves near the surface. The removal method of the present invention solves the problem of surface wave noise, direct arrival waves and Upward reflected waves will be affected by inhomogeneous body scattered waves. Scattering will occur in the conversion from body waves to surface waves and from surface waves to body waves. Scattered waves are usually not much different from reflection records or larger than reflection records. The present invention With the help of time-frequency analysis technology, the surface wave denoising is carried out on the actual record, and the scattered surface wave is removed with the help of the direction-tunable filter. signal-to-noise ratio.

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 Patents(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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