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Method for pressing regular noise in 3D earthquake data before superposition

A technology for pre-stack seismic and seismic data, applied in the field of regular noise suppression in 3D pre-stack seismic data

Active Publication Date: 2007-11-14
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to treat regular noise as having hyperbolic characteristics, provide a method that can effectively detect and suppress regular noise in 3D pre-stack seismic records, and improve the processing quality of 3D seismic data

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  • Method for pressing regular noise in 3D earthquake data before superposition
  • Method for pressing regular noise in 3D earthquake data before superposition
  • Method for pressing regular noise in 3D earthquake data before superposition

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Embodiment Construction

[0049] The method for detecting and suppressing regular noise in three-dimensional pre-stack seismic data of the present invention defines regular noise as having a hyperbolic feature.

[0050]First analyze the trace head information of seismic data, consider the influence of observation system on the distribution of regular noise, and determine the characteristics of regular noise. If it is two-dimensional seismic data, calculate according to the characteristics of regular noise in two-dimensional seismic data; if is 3D seismic data, it is calculated according to the characteristics of regular noise in 3D seismic data.

[0051] According to Figure 1, multi-channel statistical analysis is performed in the horizontal direction, and single-channel single-point calculation is performed in the vertical (time) direction, that is, multi-channel (2n+1) channels are used for statistical analysis, and the middle channel (n+1) For calculation, the traces on both sides are used as a refe...

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Abstract

The invention is a method for eliminating regular noises from 3D prestack seismic data to raise the data S / N ratio in the seismic data processing course, firstly analyzing channel head information in seismic data; adopting multichannel information analysis and single-channel one-point calculation modes and scan- stacking measure to identify the regular noises; compressing the identified regular noises; smoothening the regular noises. It adopts dichotomy classification scan-superposing technique to identify noises and adopts point-by-point automatic identification method, able to automatically adapt to any change of visual speed of the regular noises and identify and eliminate the regular noises.

Description

technical field [0001] The invention relates to a method for suppressing regular noise in three-dimensional pre-stack seismic data, which belongs to the technical category of improving the signal-to-noise ratio of data in the process of seismic data processing. Background technique [0002] Seismic exploration data collected in areas with complex surface conditions often contain strong regular noise. In 2D seismic data shots or common receiver gathers, the regular noise is distributed in the form of linear events with various dip angles; in the 3D seismic data shot records, the events of regular noise are distributed in a hyperbolic form. [0003] During seismic data processing, regular noise with strong energy directly affects the effect of deconvolution, reduces the accuracy of velocity analysis, and ultimately reduces the signal-to-noise ratio of stacked data. Although regular noise can be effectively suppressed by stacking, when its energy is strong, strong regular nois...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 钱忠平赵波
Owner BC P INC CHINA NAT PETROLEUM CORP