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A Method for Constructing Velocity Model of Seismic Data

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: 2017-09-15
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0009] The purpose of the exemplary embodiment of the present invention is to provide a method for constructing a velocity model of seismic data to overcome the problem of low velocity accuracy in seismic data in the prior art

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  • A Method for Constructing Velocity Model of Seismic Data
  • A Method for Constructing Velocity Model of Seismic Data
  • A Method for Constructing Velocity Model of Seismic Data

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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] Such as 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 t...

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Abstract

A method for constructing a velocity model of seismic data is provided, comprising: (A) obtaining an initial velocity model of seismic data; (B) using the initial velocity model to migrate a survey line to obtain an original migration profile; (C) obtaining an initial Each reference velocity model with the velocity model under at least one percentage velocity factor; (D) Use each reference velocity model to obtain the common reflection point gather; (E) Superimpose the common reflection point gather into a multi-channel mini-section of the velocity analysis point ; (F) For each layer, determine the optimal mini-section, and use the velocity of the velocity analysis point in the reference velocity model under the percentage velocity factor corresponding to the optimal mini-section as the optimal migration velocity of the velocity analysis point on the corresponding layer ; (G) Replace the corresponding velocity of each velocity analysis point in the original velocity model with the optimal migration velocity of each velocity analysis point in each horizon. According to the method, velocity accuracy in 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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Patent Type & Authority Patents(China)
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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