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Oblique Disturbance Rejection Method Based on Linear Event Iterative Tracking Attenuation

A linear interference and event technology, applied in seismology, instruments, measuring devices, etc., can solve problems such as misleading seismic geological interpretation, loss of effective reflection signals from far offset traces, strong amplitude spatial aliasing, etc., to reduce damage Possibility of valid signal, clear efficiency advantage, effect of avoiding spatial aliasing

Active Publication Date: 2021-11-05
OCEAN UNIV OF CHINA
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Problems solved by technology

These strong-amplitude coherent noises with linear events will not only interfere with the processing effects of random noise attenuation, ghost wave and multiple wave suppression, but also affect the authenticity and reliability of seismic imaging, thereby misleading subsequent seismic geological interpretation
[0003] For interference such as direct wave and shallow refracted wave, it can generally be removed directly on the record, but the effective reflection signal in the far offset trace will be lost; if the FK sector filter method is used to eliminate it, the corresponding suppression result will produce amplitude strong spatial aliasing

Method used

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  • Oblique Disturbance Rejection Method Based on Linear Event Iterative Tracking Attenuation
  • Oblique Disturbance Rejection Method Based on Linear Event Iterative Tracking Attenuation
  • Oblique Disturbance Rejection Method Based on Linear Event Iterative Tracking Attenuation

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Embodiment 1

[0029] In field seismic exploration, seismic waves are excited by sources such as explosives, air guns, or electric sparks, and seismic signals are received by geophones to obtain seismic records containing linear interference waves such as direct waves, refracted waves, or surface waves.

[0030] Sea area A is a hard seabed area, the seabed is relatively flat, and the water depth changes gently between 90 meters and 110 meters. Selected survey line X 1 It is about 45 kilometers long and uses 480 channels to receive. The shot interval and track interval are 50 meters and 12.5 meters respectively, the minimum offset distance is 170 meters, and the data sampling interval and record length are 0.004 seconds and 4.5 seconds respectively. Since the seabed is a strong reflection interface, the corresponding seismic data has strong direct wave and refracted wave interference, which seriously affects the subsequent processing effects of random noise attenuation, ghost wave elimination...

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Abstract

The invention relates to a tilt interference elimination method based on linear event iterative tracking attenuation, which belongs to the field of seismic data processing and analysis. The method for eliminating oblique interference based on linear event iterative tracking attenuation proposed by the present invention, the specific implementation process is mainly divided into the following four steps: 1) creation of high-resolution oblique superimposed spectrum; 2) linearization based on high-resolution oblique superimposed spectrum Event tracking; 3) Linear interference event attenuation using FK fan filter; 4) Multiple iterations of linear interference event tracking suppression. Compared with the traditional FK apparent velocity filtering method, this method only performs suppression processing in the short time window to which the linear interference event belongs, which reduces the possibility of damaging the effective signal; the oblique linear interference event is corrected to be horizontal by recording rearrangement , and then use the FK fan-shaped filter method to suppress it, effectively avoiding the spatial aliasing generated when filtering out the linear interference with a large dip angle.

Description

technical field [0001] The invention relates to the field of seismic data processing and analysis, and relates to an oblique interference elimination method applied to seismic data. Background technique [0002] The seismic exploration method used in oil and gas exploration is mainly the reflection wave method, which generally considers that one reflection is effective, while the direct wave, refracted wave and surface wave are all interference waves. These strong-amplitude coherent noises with linear events will not only interfere with the processing effects of random noise attenuation, ghost wave and multiple wave suppression, but also affect the authenticity and reliability of seismic imaging, thereby misleading subsequent seismic geological interpretation . [0003] For interference such as direct wave and shallow refracted wave, it can generally be removed directly on the record, but the effective reflection signal in the far offset trace will be lost; if the FK sector...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36G01V1/28
CPCG01V1/28G01V1/36G01V1/362G01V1/364G01V2210/32
Inventor 谭军赵波宋鹏李金山夏冬明姜秀萍
Owner OCEAN UNIV OF CHINA
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