Unlock instant, AI-driven research and patent intelligence for your innovation.

High-amplitude coherent noise attenuation method and apparatus

A noise attenuation and strong amplitude technology, applied in the field of strong amplitude coherent noise attenuation method and a strong amplitude coherent noise attenuation device, can solve the problems of insignificant noise elimination effect, shielding, inapplicability, etc.

Inactive Publication Date: 2017-12-29
CHINA PETROLEUM & CHEM CORP +1
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors found that this method is not suitable for dealing with all coherent noise, especially in areas where complex media exist underground
When there is refracted wave interference from complex media in the recording, the effect of using the above method to eliminate noise is not obvious
The strongly refracted interference wave has a strong amplitude and is not easily suppressed during the migration process, and it is easy to block the effective reflection signal after migration imaging
When the target layer is under such strong refracted wave interference, it is easy to be shielded by such strong interference signals, thus forming an imaging blind spot

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-amplitude coherent noise attenuation method and apparatus
  • High-amplitude coherent noise attenuation method and apparatus
  • High-amplitude coherent noise attenuation method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] figure 1 A flowchart showing a method for attenuating strong amplitude coherent noise according to an embodiment of the present invention, the method may include:

[0024] Step 101, grouping seismic gathers containing strong amplitude coherent noise;

[0025] Step 102, adding a time window to intercept records containing strong amplitude coherent noise in the grouped record set;

[0026] Step 103, identifying strong amplitude coherent noise in the grouped seismic traces based on a statistical method; and

[0027] Step 104, attenuating the identified coherent noise with strong amplitude, so as to eliminate the noise.

[0028] In this embodiment, the elimination of this type of noise is realized by using the statistical method to effectively identify the strong amplitude noise with strong coherence in the seismic trace.

[0029] The method for attenuating strong amplitude coherent noise according to the present invention will be described in detail below.

[0030] The...

Embodiment 2

[0042] According to another embodiment of the present invention, a strong amplitude coherent noise attenuation device is provided. The device may include: a grouping unit, which is used to group the seismic gathers containing strong amplitude coherent noise; a time window unit, which is used to add a time window to intercept records containing strong amplitude coherent noise in the grouped record gather; an identification unit, The method is used for identifying strong amplitude coherent noise in the grouped seismic traces based on a statistical method; and an attenuation unit is used for attenuating the identified strong amplitude coherent noise to eliminate the noise.

[0043] In one example, identifying the strong-amplitude coherent noise in the grouped seismic gathers based on a statistical method may include the following steps: calculating the standard deviation of the absolute amplitudes of samples along the gather direction; calculating the mean value or median of the a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a high-amplitude coherent noise attenuation method and apparatus. The method may include the following steps that: seismic trace gathers containing high-amplitude coherent noises in seismic records are grouped; time windows are added to intercept records containing high-amplitude coherent noise parts in the grouped seismic trace gathers; the high-amplitude coherent noises in the grouped seismic trace gathers are identified on the basis of a statistical method; and the identified high-amplitude coherent noises are attenuated, so that the noises can be eliminated. According to the high-amplitude coherent noise attenuation method and apparatus of the invention, the high-amplitude noises with high coherence in the seismic trace gathers are effectively identified by using the statistical method, and different types of noises can be eliminated.

Description

technical field [0001] The invention relates to the field of seismic data processing, and more specifically, to a strong amplitude coherent noise attenuation method and a strong amplitude coherent noise attenuation device. Background technique [0002] VSP data in complex structural areas often contain strong amplitude noise with strong coherence, mainly including ground roll waves, refracted waves, VSP casing waves, and other forms of guided waves. This kind of interference wave has a strong amplitude, it is not easy to be suppressed during the migration process, and it is easy to block the effective reflection signal, and because of the coherence and strong amplitude characteristics of this noise, it is difficult to eliminate it, which seriously affects the quality of seismic data . A number of methods for eliminating this type of noise have been developed in recent years. The most commonly used method is the tilt filter method, which uses the angle difference between th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
CPCG01V1/36G01V1/362G01V2210/32
Inventor 张洁
Owner CHINA PETROLEUM & CHEM CORP