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Surface Inconsistency Static Correction Method in τ-p Domain

A static correction and consistent technology, applied in the field of non-uniform long-wavelength static correction in the τ-p domain, can solve the problems of reducing imaging quality and difficult to eliminate the influence, and achieve good static correction effect, easy implementation, and simple calculation Effect

Active Publication Date: 2021-11-12
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Applying the static correction method based on the assumption of surface consistency to the seismic data collected in these areas, it is difficult to eliminate the influence of the low-velocity layer near the surface on the reflected wave event, which reduces the quality of subsequent imaging

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  • Surface Inconsistency Static Correction Method in τ-p Domain
  • Surface Inconsistency Static Correction Method in τ-p Domain
  • Surface Inconsistency Static Correction Method in τ-p Domain

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Embodiment 1

[0046] In the following, the theoretical model test of the present invention will be explained and described in conjunction with specific implementation methods.

[0047] In order to further illustrate the realization idea and process of this method and prove the effectiveness of the method, a horizontal layered model is used to test and compare with the results of the surface consistent static correction method.

[0048] S1: Build a real velocity model, such as figure 2 shown. The true velocity model is 20km wide and 2km deep. The real velocity model has 4 layers. From 0.35km to 0.8km in the Z direction is the low-velocity layer near the surface, and there are 3 uniform-velocity layers below it. A square grid is used to discretize the true velocity model, and the grid size is 10×10m.

[0049] S2: Observation system: adopt the observation method of shooting in the middle and receiving at both sides. The shot points are evenly distributed at 6.1-13.8km at intervals of 100...

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Abstract

The invention relates to a non-uniform long-wavelength static correction method for surface in the τ-p domain, which belongs to the field of seismic data processing in geophysical exploration. The present invention mainly includes the following steps: 1) preprocessing the land seismic data; 2) establishing a near-surface velocity model; 3) transforming the preprocessed seismic data from the time-space domain to the τ-p domain; 4) calculating The static correction amount corresponding to each ray parameter; 5) Perform static correction on the transformed seismic data; 6) Transform the statically corrected seismic data from the τ-p domain to the time-space domain. By applying the present invention, it is possible to correct the reflected waves of interfaces at different depths along their actual propagation paths in the near-surface low-velocity layer, which overcomes the shortcomings of commonly used surface-consistent static correction methods, and obtains more accurate static correction results.

Description

technical field [0001] The invention relates to a non-uniform long-wavelength static correction method for the ground surface in the τ-p domain, which belongs to the field of seismic data processing in geophysical exploration. Background technique [0002] At present, the static correction method based on the assumption of surface consistency is widely used in the process of land seismic data processing. The ground-surface consistency hypothesis holds that the velocity of the low-velocity layer near the surface is much lower than that of the underlying bedrock, and the reflected wave propagates in the vertical direction in the near-surface layer. Therefore, the reflected waves received at the same position on the surface at different depths have the same propagation path in the low-velocity layer near the surface, so the propagation time is the same. Eliminating the propagation time of the reflected wave in the near-surface low-velocity layer avoids the influence of the nea...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36G01V1/32G01V1/28
CPCG01V1/282G01V1/325G01V1/362
Inventor 杨华臣张建中任凯
Owner OCEAN UNIV OF CHINA