Low signal-to-noise ratio zone shallow wave impedance interface static correction method

Low signal-to-noise ratio zone shallow wave impedance interface static correction method

  • CN 103,576,200 A
  • Filed: 07/19/2012
  • Published: 02/12/2014
  • Est. Priority Date: 07/19/2012
  • Status: Active Application
First Claim
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1. Shallow-layer wave impedance interface, 1.Yi Zhong low signal-to-noise ratio district static correcting method, feature is to realize by following steps:

  • 1) near-surface investigation and seismic prospecting are carried out in exploratory area, or utilize territory, acquired exploratory area Seismic Stacked Section, near-surface investigation information material, determines that shallow-layer exists high-amplitude wave impedance interface;

    2) application first arrival tomographic inversion goes out near-surface velocity field, demarcates the velocity interface of shallow-layer wave impedance interface correspondence in tomographic inversion velocity field, sets up near-surface model;

    3) using shallow-layer wave impedance interface as subsurface model interface, calculate datum static correction, eliminate due near surface rise and fall and low, during reduction of speed band causes, long wavelength statics, in take in the seismologic record after correction, shorter-wavelength statics amount is as main;

    4) utilize the refraction first break information that obtains shallow-layer wave impedance interface after base-level correction to calculate refraction wave residual static correction, wave impedance interface signal to noise ratio (S/N ratio) on seismic section is brought up to can statistical computation reflection wave residual correction amount;

    5) utilize wave impedance interface echo information to calculate the reflection wave Value of residual static correction of each shot point and geophone station, eliminate residual shorter-wavelength statics amount.

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