Diffracted wave separation method based on kinematic wave field attribute

A separation method and technology of diffracted waves, applied in the field of seismic exploration data processing, can solve the problems of low signal-to-noise ratio of seismic data, difficulty in separating diffracted waves and reflected waves, etc.

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0003] With the complex structure of seismic exploration blocks, the signal-to-noise ratio of seismic data is often low, and it becomes more difficult to separate diffracted waves and reflected waves from pre-stack seismic data using the above existing techniques

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  • Diffracted wave separation method based on kinematic wave field attribute
  • Diffracted wave separation method based on kinematic wave field attribute
  • Diffracted wave separation method based on kinematic wave field attribute

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0040] In view of the low signal-to-noise ratio of seismic data in complex structural blocks and the difficulty of separating diffracted waves and reflected waves, a stacked section with a significantly improved signal-to-noise ratio is obtained through the stacking of common-reflection surface elements. The difference in the physical characteristics separates the diffracted wave information on the stacked section. The diffraction superposition section obtained by this technology can be used as input data for subsequent processing steps such as velocity modeling and migration imaging based on diffraction waves, providing technical support for the accurate interpretation of subsurface small-scale discontinuous geological bodies.

[0041] (1) Technical principle

[0042] ① Superposition of common reflection surface elements

[0043] In two-dimensional case, at the cen...

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Abstract

The invention provides a diffracted wave separation method based on a kinematic wave field attribute, and belongs to the field of seismic exploration data processing. The method comprises (1) inputting a seismic data body, (2) performing automatic CMP superposition based on a CMP gather to obtain a parameter q and a ZO profile, (3) searching a parameter [beta] and a parameter R<N> based on the ZO profile, (4) calculating a parameter R<NIP> by utilizing the parameter q and the parameter [beta], and (5) performing wave field separation by utilizing the parameter R<N> and the parameter R<NIP> to obtain a diffracted superposition profile. A difference of a diffracted wave and a reflected wave in a kinematic characteristic is fully used, a filter formula of a separated diffracted wave is designed through the kinematic wave field attribute parameters obtained in a superposition process, and diffracted wave information is separated on the superposition profile.

Description

technical field [0001] The invention belongs to the field of seismic exploration data processing, and in particular relates to a diffraction wave separation method based on kinematic wave field attributes. Background technique [0002] In seismic exploration, non-continuous media such as faults, channels, salt dome boundaries, etc., and heterogeneous target media such as stratum pinch-out, etc. are crucial for structural interpretation, lithology interpretation, and fine description of oilfield exploration and development stages. The main performance is rich diffraction wave information. However, imaging using diffracted wave information is a great challenge, because compared with reflected waves, the energy of diffracted waves is much weaker and is often covered by reflected waves, so when identifying small-scale anomalies, it is usually Reflected and diffracted waves are separated and imaged separately. The quality of wave field separation will directly affect the imagin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 李栋徐兆涛王立歆胡光辉刘志成孔祥宁
Owner CHINA PETROLEUM & CHEM CORP
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