A passive source interference migration imaging method and system based on illumination direction constraints

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

Active Publication Date: 2022-08-02
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A passive source interference migration imaging method and system based on illumination direction constraints
  • A passive source interference migration imaging method and system based on illumination direction constraints
  • A passive source interference migration imaging method and system based on illumination direction constraints

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Embodiment 1

[0047] like figure 1 As shown, it is a schematic flowchart of the passive source interference migration imaging method based on illumination direction constraint in Embodiment 1 of the present application, which is mainly composed 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 are described in detail below.

[0048] The first step is to interferometrically process the seismic records of the single-point pulse-type passive source to obtain the deconvolution function of the passive source. Through the deconvolution function, the inaccurate interference virtual shot set records can be obtained.

[0049] For pulsed passive sources, Wapenaar & Fokkema (2006) introduced that in the acoustic medium, the passive source is continuously uniformly distributed (each at x s , mark x in the first embodiment s characterizing passive sources)...

Embodiment 2

[0094] like image 3 As shown, it is a schematic structural diagram of a passive source interference migration imaging system based on illumination direction constraint 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 interferometrically process 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 records; the illumination analysis module is used to analyze the deconvolution function. Perform tilt stacking processing, and extract the ray parameters corresponding to the peak 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 illumination informatio...

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Abstract

The present application discloses a passive source interference migration imaging method and system based on illumination direction constraints. The method includes interferometric processing of single-point pulse passive source seismic records to obtain a passive source deconvolution function; The function is subjected to oblique superposition processing to obtain the effective illumination information direction; based on the deconvolution function and the effective illumination information direction, the offset imaging result is obtained. The system includes a deconvolution module, an illumination analysis module and an imaging module; the deconvolution module is used to interferometrically process the seismic records of the single-point pulse-type passive source to obtain a deconvolution function; the illumination analysis module is used to deconvolution The function performs oblique superposition processing to obtain the effective illumination information direction; the imaging module obtains the offset imaging result according to the deconvolution function and the effective illumination information direction. The present application can extract the effective information contained in the data and obtain accurate imaging results under the condition that the traditional assumptions are not satisfied.

Description

technical field [0001] The present application belongs to the technical field of passive source seismic exploration and 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, background noise, etc. are generally regarded as interference, and these noises also conform to the propagation law of seismic waves and carry rich information on underground media. Passive source interferometric imaging is a method that utilizes these so-called "noises" for imaging. The method does not need to know the prior information of the underground medium, is completely data-driven, and can eliminate the influence of shallow complex medium due to data reconstruction. Passive seismic exploration is also more suitable for areas where active seismic exploration is inconvenient, such as cities and mountainous areas with complex terr...

Claims

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Application Information

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