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Method and device for attenuating ghost waves during process of processing marine seismic data

A technology of seismic data and wave attenuation, which is applied in seismic signal processing and other directions, can solve the problems of high operating cost and increased industrial cost, and achieve the effect of improving processing quality

Active Publication Date: 2013-09-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ghost waves are divided into ghost waves on the side of the source, ghost waves on the side of the receiver point, and ghost waves on both sides of the source and receiver points. The traditional SRME method cannot be directly applied to this kind of ghost wave suppression, and the ghost wave can be suppressed by changing the acquisition method. Will greatly increase the industrial cost
Weglein (1997) et al. proposed a completely data-driven inverse scattering method to remove interlayer multiples. This method can predict all interlayer multiples at one time from the inverse scattering subsequence, but the operating cost is very high. In the industry Not yet applied

Method used

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  • Method and device for attenuating ghost waves during process of processing marine seismic data
  • Method and device for attenuating ghost waves during process of processing marine seismic data
  • Method and device for attenuating ghost waves during process of processing marine seismic data

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Experimental program
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Embodiment 1

[0037] like image 3 As shown, it is a flowchart of a method for ghost wave attenuation in marine seismic data processing in this embodiment, including the following steps:

[0038] Step 301, cutting off the direct wave and sea surface reflected wave in the original seismic record to obtain record A;

[0039] like Figure 5 as shown,

[0040] Figure 5 a is the single-shot record obtained by forward modeling, including direct arrival wave, sea surface reflection wave, primary reflection wave, single-side ghost wave and double-side ghost wave, that is, the original seismic record;

[0041] Figure 5 b is the record wave field with the direct wave and sea surface reflection wave removed, that is record A.

[0042] Step 302, extracting the sea surface reflection wave M and the reflection layer primary reflection wave P from the original seismic record;

[0043] like Image 6 as shown,

[0044] Image 6 a is the extracted sea surface reflection wave M. Since the sea surfa...

Embodiment 2

[0075] like Figure 4 As shown, it is a structural diagram of a device for ghost wave attenuation in marine seismic data processing according to an embodiment of the present invention, including: record A extraction unit 401, sea surface reflection wave extraction unit 402, primary reflection wave extraction unit 403, one-sided ghost wave A prediction unit 404 , a bilateral ghost prediction unit 405 , an energy matching unit 406 and a ghost attenuation unit 407 .

[0076] When the device is working, the data of the original seismic record needs to be sent to the record A extraction unit 401 , the sea surface reflection wave extraction unit 402 and the primary reflection wave extraction unit 403 . in,

[0077] The record A extraction unit 401 is used to cut off the direct wave and sea surface reflected wave in the original seismic record to obtain record A;

[0078] A sea surface reflection extraction unit 402, configured to extract the sea surface reflection M from the origi...

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Abstract

The invention provides a method and a device for attenuating ghost waves during the process of processing marine seismic data. The method comprises the following steps of cutting away direct waves and sea surface reflection waves from original seismic records to obtain records A; extracting the sea surface reflection waves M and primary reflection waves P of a reflecting layer from the original seismic records; carrying out convolution on the sea surface reflection waves M and the primary reflection waves P of the reflecting layer to obtain single-side ghost waves G1 of the relevant focus or detector side of the reflecting layer; carrying out convolution on the sea surface reflection waves M and the single-side ghost waves G1 of the focus or detector side to obtain double-side ghost waves G2 of a focus and a detector; carrying out energy matching on the single-side ghost waves G1, the double-side ghost waves G2 and the records A to obtain matched single-side ghost waves G1m and double-side ghost waves G2m; and removing the matched single-side ghost waves G1m and double-side ghost waves G2m from the records A to obtain records Sdghost with attenuated ghost wave. By the adoption of the method and the device for attenuating the ghost waves during the process of the processing marine seismic data, as the ghost waves are predicted and attenuated only through data driving, independent of the precision of a velocity field, the processing quality of the marine seismic data is improved.

Description

technical field [0001] The invention relates to the technical field of seismic data processing, in particular to a method and device for ghost wave attenuation in marine seismic data processing. Background technique [0002] With the deepening of oil and gas exploration, marine oil and gas exploration has received more and more attention. The results of marine seismic data processing are an important basis for marine oil and gas exploration, and multiple waves are one of the most critical factors affecting marine seismic data processing. Because there are reflection interfaces with strong velocity differences at the sea level and the bottom of the sea, the reflection coefficient is very large, so the surface-related multiples are very developed, which seriously affects the reliability of seismic data processing and interferes with the judgment of seismic data interpreters on structures. In marine seismic data exploration, both the source air gun and the receiving cable are a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 叶月明赵昌垒姚根顺庄锡进
Owner PETROCHINA CO LTD
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