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Method for eliminating linear and non-linear interference wave by using filtering operation at deep layer domain

A technology of depth domain and interference wave, which is applied in the direction of seismic signal processing, etc., can solve the problems that the denoising method cannot completely separate the noise and the signal, the denoising effect cannot be achieved, and the statistical characteristics of frequency, apparent velocity, and propagation direction are difficult to distinguish, etc. , to achieve the effect of reducing spatial aliasing and eliminating incorrect continuation

Active Publication Date: 2006-07-05
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Application Information

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Problems solved by technology

[0003] However, as the surface and near-surface seismic geological conditions in the exploration area become more and more complex, various ground obstacles near the excitation source and near-surface lithological changes cause a wide variety of interference waves, sand dune tremors in the desert, and multiple or Micro-bending multiple waves, as well as interference waves generated by various ground and underground facilities in oilfield development areas, the linear and nonlinear interference waves generated by these complex near-surface areas are often manifested in frequency, apparent velocity, propagation direction, polarization direction and It is difficult to effectively distinguish the reflected signal from the statistical characteristics, so the traditional data-driven denoising method that uses the difference between the signal and the noise in the data cannot completely separate the noise and the signal, and cannot achieve the ideal denoising effect

Method used

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  • Method for eliminating linear and non-linear interference wave by using filtering operation at deep layer domain
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  • Method for eliminating linear and non-linear interference wave by using filtering operation at deep layer domain

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Embodiment 1

[0046] For the collected seismic shot data, the seismic data of a two-dimensional survey line is selected for depth-domain filtering processing. The basic situation of the data is as follows:

[0047] The data channel length is 4000ms, and the sampling interval is 4ms.

[0048] The survey line data includes 351 shots in total, and each shot has 800 traces.

[0049] 1) Firstly, data gain is performed, track equalization is performed on the data along the spatial x direction, and amplitude compensation is performed along the time direction, so that the data can be adapted to wave equation processing.

[0050] 2) Next, carry out two-dimensional Fourier forward transform and downward wave field continuation, and extend the shot set from the ground surface to the reference surface according to the formulas (4) and (5). The depth of the selected reference surface is 150m, which is divided into three layer, the thickness and speed of each layer are: 80m, 40m and 30m, 2000m / s, 2400m / ...

Embodiment 2

[0064] For the collected seismic shot data, the seismic data of one shot 3D survey line is selected for depth-domain filtering processing. The basic information of the data is as follows:

[0065] The data channel length is 6000ms, and the sampling interval is 2ms.

[0066] The data includes 8 survey lines, each with 192 traces.

[0067] Dx=40m, Dy=240m

[0068] 1) Firstly, data gain is performed, track equalization is performed on the data along the spatial x and y directions, and amplitude compensation is performed along the time direction, so that the data can be adapted to wave equation processing.

[0069] 2) Next, carry out the three-dimensional Fourier transform and extend the downward wave field. The shot set is extended from the ground surface to the reference plane according to the formulas (5) and (6). The depth of the selected reference plane is 150m, which is divided into three layers , the thickness and speed of each layer are: 80m, 40m and 20m, 2000m / s, 2400m / ...

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Abstract

The invention is a method for eliminating linear and nonlinear interference waves by depth domain filtering: gaining the routine collected seismic shot gather data, and making channel equalization on the data in the direction of space and making amplitude compensation on the data in the direction of time to make the data adapted to wave equation processing; making Fourier transform on the shot gather and downward wave-field extrapolation from ground surface to datum on the shot gather; making depth-domain filtering on the shot gather; and making upward wave-field extrapolation from datum to ground surface and reverse Fourier transform on the shot gather; it can effectively recognize linear and nonlinear interference waves generated on a complex near-ground surface and eliminating them by depth-domain filtering.

Description

technical field [0001] The invention relates to a petroleum seismic exploration data processing technology, in particular to a method for eliminating linear and nonlinear interference waves in seismic records by using depth domain filtering. Background technique [0002] In the field of seismic exploration, traditional signal enhancement or noise suppression techniques generally use the frequency (low-pass, high-pass or band-pass filtering), apparent velocity (FK filtering), polarization direction (polarization filtering) and statistical characteristics of the signal and noise. (random noise attenuation) and other aspects to separate or predict the signal and noise, and then process the signal or noise accordingly. This type of method is called a data-driven denoising method. [0003] However, as the surface and near-surface seismic geological conditions in the exploration area become more and more complex, various ground obstacles near the excitation source and near-surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36G01V1/28
Inventor 柯本喜耿伟峰
Owner BC P INC CHINA NAT PETROLEUM CORP