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Method for removing shallow noise through extrapolation method

A technology of extrapolation and noise, which is applied in seismology and seismic signal processing for well logging records, and can solve problems such as inability to identify linear events and low signal-to-noise ratio, and achieve fast calculation speed and good effect , Improve the effect of signal-to-noise ratio

Pending Publication Date: 2021-11-02
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

In actual seismic data, there is a phenomenon that the signal-to-noise ratio is very low and the linear event cannot be identified, so this method is useless

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  • Method for removing shallow noise through extrapolation method
  • Method for removing shallow noise through extrapolation method
  • Method for removing shallow noise through extrapolation method

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Embodiment Construction

[0033] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0034] It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations and / or combinations thereof.

[0035] The technology of extrapolation to remove shallow noise is to extrapolate seismic waves to remove shallow noise. This technology simulates the proce...

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Abstract

The invention provides a method for removing shallow noise through an extrapolation method. The method comprises the steps of 1 loading an observation system, and obtaining a seismic signal containing observation information; 2 giving an initial speed; 3 carrying out wave field extrapolation on the signal; 4 removing data above the interface; and 5 carrying out inverse transformation to obtain noise-removed data. The method for removing the shallow noise through the extrapolation method can effectively remove the noise generated by a shallow interference source, has the advantages which are not possessed by other methods, abandons some data transformation in a conventional method, is more practical in algorithm, is a more advanced method, and is simple in flow and parameter setting, high in operation speed and accurate in calculation result; the effect of suppressing the noise of a shallow interference source is obvious, and the signal-to-noise ratio is effectively improved.

Description

technical field [0001] The invention relates to the field of oil and gas exploration seismic data processing, in particular to a method for removing shallow layer noise by extrapolation. Background technique [0002] There are many existing methods for removing noise generated by shallow interference sources, such as Fourier transform, Radon transform, wavelet transform, and curvelet transform, etc. These methods all use some mathematical transformations. The technique of separating waveforms depending on the speed difference or the difference in arrival time, in fact, the noise and the effective wave are superimposed together, and this transformation cannot completely distinguish the noise from the effective wave, so these methods may not clean the noise, Or the energy of the effective wave will be lost. [0003] With the continuous improvement of oil and gas exploration, the exploration targets are becoming more and more complex, the difficulty of exploration and developm...

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Application Information

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IPC IPC(8): G01V1/36G01V1/40
CPCG01V1/36G01V1/40
Inventor 李凌云韩宏伟孙治国葛大明马季王静轩张传强潘树林张江华
Owner CHINA PETROLEUM & CHEM CORP