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Migration Method for Multisub-Bokschoff Seismic Data

A seismic data and wavelet technology, applied in the field of seismic data processing and interpretation, can solve problems such as poor resolution of seismic wavelets, distribution and changes of physical properties, and imaging results that cannot effectively reflect the structure of underground strata, so as to improve migration The effect of precision

Active Publication Date: 2017-04-05
武世国
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  • Abstract
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AI Technical Summary

Problems solved by technology

Poor resolution of seismic wavelets in seismic traces
[0006] 3. The imaging results corresponding to wavelets of different scales obtained from the migration results cannot effectively reflect the structure of underground strata, or the distribution and changes of physical properties

Method used

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  • Migration Method for Multisub-Bokschoff Seismic Data
  • Migration Method for Multisub-Bokschoff Seismic Data
  • Migration Method for Multisub-Bokschoff Seismic Data

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Experimental program
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Embodiment Construction

[0030] see figure 1 Shown: attached figure 1 Is a schematic diagram of the workflow, the entire multi-sub-Porkschoff migration can be divided into five steps:

[0031] 1. Generate multi-seismic wavelet sequences.

[0032] a) If mathematical wavelets are used, that is, wavelets of different main frequencies can be calculated through a mathematical expression, and only need to calculate the wavelet sequence in order. For example, the mathematical expression of the Reick wavelet is

[0033]

[0034] where f i is the maximum amplitude frequency of the wavelet. Given different, equally spaced frequencies of maximum amplitude f i , the corresponding wavelet sequence can be obtained.

[0035] b) In the process of seismic data processing and interpretation, a seismic wavelet consistent with the data can usually be extracted from the seismic data, and the wavelet is expressed as a floating-point array with equal time intervals. In this case, we use Cubic spline smooth interpo...

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Abstract

A multi-wavelet Kirchhoff seismic data migration method includes the steps: (1) generating multiple seismic wavelet sequences; (2) resolving seismic traces according to the multiple seismic wavelet sequences to obtain a sparse seismic wavelet coefficient sequence satisfying 1<1> norm optimization; (3) selecting a main frequency of to-be-migrated wavelets; (4) in the Kirchhoff migration algorithm, modifying a method for calculating sampling point input time according to given imaging time into a method for calculating imaging time of a wavelet according to given wavelet input time; (5) subjected migrated seismic traces with common reflection points to reconstruction and overlapping to obtain a migration image of the given wavelet. The multi-wavelet Kirchhoff seismic data migration method has the advantages that seismic data migration precision is improved to obtain precise migration results of distribution and changes of underground formation and physical characteristics under different wave bands of multiple seismic wavelets, and reliable data can be provided for further explanation of resources (such as oil gas, coal, mineral products and the like).

Description

technical field [0001] The invention relates to the technical field of seismic data processing and interpretation in the exploration of seismic resources (petroleum, coal, minerals, etc.), and belongs to a multi-sub-Bokschoff seismic data migration method. Background technique [0002] Seismic data migration is an important link in the process of seismic data processing. At present, seismic data are expressed by sampling the vibration amplitude of a certain earth plane at equal time intervals. A seismic trace represents the vibration of a point on the plane in a period of time, and is actually expressed as an array of floating point numbers. Therefore, the current conventional seismic data processing is based on, or built on, vibration sample points. In the sample-based migration calculation, it is inevitable to use the sample point interpolation of the vibration field, which will cause dispersion noise and seismic fluctuations or stretching deformation of wavelets, resulti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 安平林禄春
Owner 武世国
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