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Passive source interference migration imaging method and system based on illumination direction constraint

A technology of offset imaging and lighting direction, applied in the direction of seismic signal receivers, etc., can solve the problems of unsatisfactory distribution of underground seismic sources and inaccurate imaging results, etc., and achieve the effect of wide application range and cost saving

Active Publication Date: 2021-12-31
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual exploration situation, the distribution of underground seismic sources often cannot meet the assumption
This will lead to inaccurate imaging results, or it contains a lot of interference artifacts

Method used

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  • Passive source interference migration imaging method and system based on illumination direction constraint
  • Passive source interference migration imaging method and system based on illumination direction constraint
  • Passive source interference migration imaging method and system based on illumination direction constraint

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as figure 1 As shown, it is a schematic flow chart of the passive source interference migration imaging method based on illumination direction constraints in Embodiment 1 of the present application, which mainly consists of three steps: passive source interference, illumination information extraction, and illumination direction constraint migration imaging. The three steps of Embodiment 1 of the present application will be described in detail below.

[0048] The first step is to perform interference processing on the seismic records of the single-point pulse passive source to obtain the deconvolution function of the passive source. Through the deconvolution function, the inaccurate interference virtual shot record can be obtained.

[0049] For pulse-type passive sources, Wapenaar&Fokkema (2006) introduced that in the acoustic wave medium, when the passive sources are continuously and uniformly distributed (each located at x s , mark x in this embodiment one s In ...

Embodiment 2

[0094] Such as image 3 As shown, it is a schematic structural diagram of a passive source interference migration imaging system based on illumination direction constraints in Embodiment 2 of the present application, including a deconvolution module, an illumination analysis module, and an imaging module.

[0095] Among them, the deconvolution module is used to perform interference processing on the seismic records of the single-point pulse type passive source to obtain the deconvolution function, and the deconvolution function is used to obtain the virtual shot set record; the illumination analysis module is used to analyze the deconvolution function Perform oblique superposition processing, and extract the ray parameters corresponding to the peak value at time zero to obtain the effective illumination information direction; the imaging module is used to perform offset imaging processing on the virtual shot set records according to the deconvolution function and the effective ...

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Abstract

The invention discloses a passive source interference migration imaging method and system based on illumination direction constraint, and the method comprises the steps: carrying out the interference processing of a single-point pulse type passive source seismic record, and obtaining a deconvolution function of a passive source; carrying out inclined superposition processing on the deconvolution function to obtain an effective lighting information direction; and obtaining a migration imaging result based on the deconvolution function and the effective lighting information direction. The system comprises a deconvolution module, an illumination analysis module and an imaging module. The deconvolution module is used for performing interference processing on the seismic record of the single-point pulse type passive source to obtain a deconvolution function; the illumination analysis module is used for performing inclined superposition processing on the deconvolution function to obtain an effective lighting information direction; and the imaging module obtains a migration imaging result according to the deconvolution function and the effective lighting information direction. Under the condition that the traditional hypothesis is not met, effective information contained in the data can be extracted, and an accurate imaging result is obtained.

Description

technical field [0001] The application belongs to the technical field of passive source seismic exploration imaging, and in particular relates to a passive source interference migration imaging method and system based on illumination direction constraints. Background technique [0002] In seismic exploration, natural earthquakes and background noise are generally considered as interference, and these noises also conform to the propagation law of seismic waves and carry rich information about underground media. Passive source interferometric imaging is the method of using these so-called "noises" for imaging. This method does not need to know the prior information of the subsurface medium, is completely data-driven, and can eliminate the influence of shallow complex media due to data reconstruction. It is also more suitable for passive source seismic exploration in areas where active source seismic exploration is not easy to implement, such as cities and mountainous areas wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/18
CPCG01V1/18
Inventor 王德利苏一哲胡斌
Owner JILIN UNIV
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