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Beaded earthquake response feature focusing optimization method and system

A seismic response and beading technology, applied in the field of seismic exploration, can solve the problems of relying on initial model convergence, easy to fall into local extremum, and high computational cost

Active Publication Date: 2019-08-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The inventors found that the calculation of imaging technology using least squares migration is expensive, it is very dependent on the initial model, and the convergence is easy to fall into the local extremum, resulting in a beaded seismic response feature that never converges; full waveform inversion also faces the same problem

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  • Beaded earthquake response feature focusing optimization method and system
  • Beaded earthquake response feature focusing optimization method and system
  • Beaded earthquake response feature focusing optimization method and system

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Embodiment 1

[0019] figure 1 A flow chart showing the steps of the method for focusing and optimizing the beaded seismic response features according to the present invention.

[0020] In this embodiment, the beaded seismic response feature focusing optimization method according to the present invention may include: S1, performing velocity replacement based on the pre-stack time migration velocity model, and obtaining multiple replacement migration velocity volumes; S2, based on the The multiple replacement migration velocity volumes are performed to perform pre-stack time migration to obtain multiple post-stack data volumes; S3, based on the beaded seismic response characteristics in the seismic data, select a three-dimensional cube window; S4, based on the multiple post-stack data volumes A data volume, obtaining the statistical time difference of multiple post-stack data volumes in the three-dimensional cube window; and S5, based on the statistical time difference, obtaining an optimal m...

Embodiment 2

[0044] According to an embodiment of the present invention, a beaded seismic response feature focusing optimization system is provided, and the system may include: performing velocity replacement based on the prestack time migration velocity model, and obtaining multiple replacement migration velocity volumes A unit; used to perform pre-stack time migration based on the multiple replacement migration velocity volumes to obtain multiple post-stack data volume units; used to select a three-dimensional cube window based on the beaded seismic response characteristics in seismic data A unit; a unit for obtaining the statistical time difference of a plurality of post-stack data volumes in the three-dimensional cube window based on the plurality of post-stack data volumes; and a unit for obtaining an optimal migration velocity and The unit of the optimal seismic trace.

[0045] This embodiment performs continuous pre-stack time migration by replacing the migration velocity of the tar...

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Abstract

The invention discloses a bead-like seismic response feature focusing and optimization method and system. The method comprises: on the basis of a pre-stack time offset velocity model, velocity replacement is carried out to obtain a plurality of replacement offset velocity bodies; according to the plurality of replacement offset velocity bodies, pre-stack time offset processing is carried out to obtain a plurality of post-stack data bodies; on the basis of bead-like seismic response features in seismic data, a three-dimensional cubic window is selected; a statistic time difference of the plurality of post-stack data bodies in the three-dimensional cubic window is obtained based on the plurality of post-stack data bodies; and an optimal offset velocity and an optimal seismic trace are obtained based on the statistic time difference.

Description

technical field [0001] The present invention relates to the field of seismic exploration, and more specifically, to a method and system for focusing and optimizing seismic response characteristics of beads. Background technique [0002] In the field of seismic exploration, for unconventional carbonate reservoirs, large-scale karst caves often develop, which appear as beaded seismic response characteristics on the seismic section. The "beaded" imaging is closely related to the migration velocity model. When the migration velocity is too large When the deviation speed is small, the "beads" bend downwards and the energy is weak; when the deviation speed is just right, the "beads" are the most convergent and have the strongest energy. However, due to the conventional velocity spectrum picking, the grid is large, resulting in an inaccurate migration velocity model, so the "beads" often appear upturned or bent down, and the imaging of the "beads" is not accurate, which is not cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
CPCG01V1/28
Inventor 许凯唐金良王世星
Owner CHINA PETROLEUM & CHEM CORP