Method for eliminating linear regular noise and multiple wave disturbance in self-adapting mode

A self-adaptive, multiple-wave technology, applied in the fields of development, exploitation, and oilfield exploration, can solve the problems of influence, not well-solved the problem of separation of effective signal and noise, and achieve a good noise suppression effect and fast calculation speed. Effect

Inactive Publication Date: 2009-12-09
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

These methods have achieved certain results in removing linear interference, but some of these methods do not solve the separation problem of effective signal and noise well. While filtering out noise, the area without interference pollution will also be affected to a certain extent. influences

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  • Method for eliminating linear regular noise and multiple wave disturbance in self-adapting mode
  • Method for eliminating linear regular noise and multiple wave disturbance in self-adapting mode
  • Method for eliminating linear regular noise and multiple wave disturbance in self-adapting mode

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example 1

[0036] Example 1 of the present invention adopts the following technical scheme to realize, comprising the following steps:

[0037] (1) Seismic data preprocessing. Excite and collect seismic data with the usual source excitation means, label the seismic data, define the observation system, and analyze the frequency spectrum; determine the effective frequency band of linear regular noise or multiple wave interference of the seismic data through frequency spectrum analysis.

[0038] (2) Linear transformation of seismic records. Get the relationship between the inclination angle and the Tao and time:

[0039] tgθ = t 2 - t 1 n 2 - n 1 - - - ( ...

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Abstract

The invention relates to a method for eliminating linear regular noise of seismic prospecting and multiple wave disturbance in a self-adapting mode, aiming to provide seismic figures with high resolution for the exploration of oil fields. The method comprises the following steps: transforming seismic data sets in a field according to regular disturbance linear event virtual inclination; subtracting a seismic trace and a noise model trace to obtain a current signal value; determining the receiving probability of the noise by utilizing a probability density function and a threshold value; subtracting the separated noise from an original record to eliminate a regular interference wave; carrying out linear inverse transform on the seismic data to obtain a data set; carrying out linear inverse transform on the record with the regular interference wave being eliminated to obtain a seismic record; and carrying out separate frequency processing and noise suppressing processing. The invention dose not damage the frequency components of effective waves and has the advantages of fast operation speed, good effect for suppressing noise, suitability for pre-stack seismic data and post-stack seismic data, and the like.

Description

technical field [0001] The invention relates to oil field exploration, development and mining technology, in particular to a method for self-adaptive elimination of seismic exploration linear regular noise and multiple wave interference by reflecting underground stratum levels and oil reservoirs and providing high-resolution seismic graphics. Background technique [0002] The process of seismic exploration is to artificially excite seismic waves at a series of points on the ground, and the seismic waves propagate underground. When the wave impedance of the upper and lower strata is not equal), the seismic wave reflects on the wave impedance interface, the direction of seismic wave propagation changes, and the seismic wave begins to propagate upward. Receivers are placed on a series of receiving points on the ground to receive the upwardly propagating seismic wave data to complete field exploration. While artificial excitation produces effective seismic waves, it also produc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 高少武赵波
Owner BC P INC CHINA NAT PETROLEUM CORP
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