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Diffracted wave field separation method based on pre-stack gaussian beam depth migration

A technology of depth migration and diffraction waves, applied in the field of petroleum exploration, can solve the problem that the diffraction point cannot be identified, and achieve the effect of suppressing the influence of noise and improving the imaging accuracy.

Inactive Publication Date: 2014-08-13
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

In the usual CRP gathers, both the diffraction points and the reflection points appear as the flattening of the event axis, so that the diffraction points cannot be identified in the CRP gathers

Method used

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  • Diffracted wave field separation method based on pre-stack gaussian beam depth migration

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Embodiment Construction

[0039] The specific implementation manner of the present invention is described in conjunction with Sigsbee2a numerical model and accompanying drawing.

[0040] See figure 1 , Flow chart of diffraction wavefield separation method based on prestack Gaussian beam depth migration.

[0041] A diffracted wavefield separation method based on prestack Gaussian beam depth migration, which takes high-quality prestack seismic data as input, and outputs dip gathers through prestack Gaussian beam depth migration. The difference in dip domain ( figure 2 ), use similarity spectrum analysis to remove reflection vertex energy, extract diffracted wave energy, and perform imaging separately in order to better identify fracture-cavity reservoirs;

[0042] The specific implementation steps of the present invention are as follows:

[0043] Step 1: Perform amplitude-preserving processing on the seismic data, and rearrange the seismic data into shot records.

[0044] Step 2: Prestack Gaussian b...

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Abstract

The invention discloses a diffracted wave field separation method based on pre-stack gaussian beam depth migration. High-quality pre-stack earthquake data serve as input, and a dip channel set is output through pre-stack gaussian beam depth migration. By means of difference of a reflection wave and a diffracted wave in a dip domain and by the adoption of similar spectrum analysis, energy of a reflection vertex is removed, energy of the diffracted wave is extracted, imaging is carried out independently, and a cave and fracture reservoir is better recognized. According to accurate description of a secondary carbonate rock cave type reservoir under a complex geological structure and with the combination of the gaussian beam earthquake migration technology, noise influences of complex structure imaging is effectively prevented, imaging precision of a diffracted target is improved, and accordingly the method serves high-precision carbonate rock cave reservoir description under complex medium conditions, and technical theories of diffracted wave field separation are improved and developed.

Description

technical field [0001] The invention belongs to the field of petroleum exploration, and relates to a cave imaging technology based on pre-stack Gaussian beam depth migration, in particular to a diffraction wavefield separation method based on pre-stack Gaussian beam depth migration. Background technique [0002] Seismic exploration infers underground information through the response of seismic waves to the underground medium. When there is a sudden change in the underground medium, the response is often a diffracted wave. In the carbonate rock areas in western China, such as the Tarim Basin, the main reservoir spaces for oil and gas are secondary dissolved pores and fractures. Therefore, it is particularly important to identify such secondary pores in oil and gas exploration. Areas tend to be good reservoirs. However, the distribution of dissolution pores in the ground is very irregular, and their size is smaller than the wavelength of seismic waves, and their seismic respo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30G01V1/34
Inventor 孙赞东刘豫宝孔雪潘文庆
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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