Method used for building seismic data velocity model

A technology of seismic data and velocity model, applied in the direction of seismic signal processing, etc., can solve the problem of low velocity accuracy of seismic data and achieve the effect of improving velocity accuracy

Active Publication Date: 2015-09-23
BC P INC CHINA NAT PETROLEUM CORP +1
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[0009] The purpose of the exemplary embodiment of the present invention is to provide a method for constructing a

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  • Method used for building seismic data velocity model
  • Method used for building seismic data velocity model
  • Method used for building seismic data velocity model

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Embodiment Construction

[0024] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like numerals refer to like parts throughout. The embodiments are described below in order to explain the present invention by referring to the figures.

[0025] figure 1 A flowchart showing a method for constructing a velocity model of seismic data according to an exemplary embodiment of the present invention. Here, as an example, the method may be implemented by a device for constructing a velocity model of seismic data, or may be implemented entirely by a computer program.

[0026] like figure 1 As shown, in step S100, the initial velocity model of the seismic data is acquired.

[0027] Specifically, since seismic wave velocity is one of the most important parameters in seismic exploration and is widely used in many links in the process of seismic data processing and interpretation, the accuracy of the ...

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Abstract

The invention provides a method used for building a seismic data velocity model. The method comprises the steps that (A) a seismic data initial velocity model is acquired; (B) the initial velocity model is used to offset a seismic line to acquire an original offset profile; (C) each reference velocity model of the initial velocity model under at least one percentage velocity factor is acquired; (D) each reference velocity model is used to acquire a common reflection point gather; (E) the common reflection point gathers are superimposed to form a number of mini-profiles of velocity analysis points; (F) for each layer, a preferred mini-profile is determined, and the velocity of a velocity analysis point in the reference velocity model under the percentage velocity factor corresponding to the preferred mini-profile is used as the preferred offset velocity of the velocity analysis point in the corresponding layer; and (G) the preferred offset velocity of each velocity analysis point in each corresponding layer is used to replace the corresponding velocity of each velocity analysis point in the original velocity model. According to the method, the velocity accuracy of seismic data can be improved.

Description

technical field [0001] The present invention relates generally to the field of seismic data analysis. More specifically, it relates to a method of constructing a velocity model of seismic data. Background technique [0002] Prestack time migration is one of the most effective methods for imaging complex structures, which can adapt to large vertical and horizontal velocity changes and is suitable for migration imaging at large dip angles. The main factors that affect the effect of migration imaging are the migration aperture and migration velocity. In particular, prestack migration is more sensitive to migration velocity, and small velocity errors may affect the effect of migration imaging. Therefore, it is relatively accurate to obtain The velocity parameter is the basis for obtaining a better imaging migration profile. [0003] At present, the pre-stack time migration velocity analysis methods mainly include: [0004] (1) Vertical residual delay analysis method: This met...

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Application Information

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IPC IPC(8): G01V1/30
Inventor 熊晶璇朱晨曹中林何光明金德刚陈三平刘鸿唐虎
Owner BC P INC CHINA NAT PETROLEUM CORP
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