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A method and system for suppressing source coding crosstalk noise in full waveform inversion

A technology of full waveform inversion and encoding strings, which is applied in the field of geological exploration, can solve problems such as large amount of calculation and difficulty in program development, achieve the effect of small amount of data calculation, promote accurate and fast convergence, and reduce negative impact

Active Publication Date: 2018-06-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have the disadvantages of large amount of calculation and difficult program development in the data domain.

Method used

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  • A method and system for suppressing source coding crosstalk noise in full waveform inversion
  • A method and system for suppressing source coding crosstalk noise in full waveform inversion
  • A method and system for suppressing source coding crosstalk noise in full waveform inversion

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Embodiment 1

[0052] figure 1 It is a flow chart of the steps of the method for suppressing the source code crosstalk noise in the full waveform inversion of this embodiment.

[0053] First, in step S101, low-pass filtering is performed on the velocity model updated during the inversion iteration process, so as to eliminate the interference caused by high-frequency noise to the search for the main signal direction of the geological structure. Specifically, mean low-pass filtering, median low-pass filtering, or Gaussian low-pass filtering can be used to filter the velocity model updated during the iterative process to eliminate high-frequency interference caused by noise, thereby reducing the need to find the main signal direction. time error.

[0054] In this embodiment, a Gaussian low-pass filtering method is preferably used.

[0055] The sample points in the updated velocity model during the inversion iteration can be expressed as I(x,y). The velocity model is divided into multiple fil...

Embodiment 2

[0078] This embodiment provides a system for suppressing crosstalk noise of source codes in full waveform inversion. Such as Figure 5 As shown, the system includes a preprocessing module 51 , a principal component analysis module 52 and a directional filtering module 53 .

[0079] The preprocessing module 51 is used for low-pass filtering the velocity model updated during the inversion iteration process. Specifically, mean low-pass filtering, median low-pass filtering or Gaussian low-pass filtering can be used to filter the velocity model updated during the inversion iteration process to eliminate high-frequency interference caused by noise.

[0080] Preferably, the Gaussian low-pass filter in the Gaussian low-pass filtering method is:

[0081]

[0082] Among them, H i,j is the discrete Gaussian convolution kernel function, σ 2 is the variance, k is the dimension of the Gaussian convolution kernel matrix, i is the longitudinal coordinate of the velocity model filtering...

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Abstract

The invention discloses a method and a system for suppressing the crosstalk noise of the full waveform inversion seismic source code. The method includes: performing low-pass filtering on the velocity model updated in the inversion iteration process; performing principal component analysis on the velocity model after the low-pass filtering to determine the main signal direction of the stratum geological structure; performing directional filtering along the main signal direction to suppress Source coded crosstalk noise in a direction different from the main signal. The invention utilizes the direction difference between the signal and the noise in the full waveform inversion speed model, and filters in the direction of the effective signal, which can not only protect the integrity of the effective signal, but also remove the noise.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and system for suppressing crosstalk noise of source codes in full waveform inversion. Background technique [0002] In recent years, the full-wave inversion theory has received extensive attention in the field of geological exploration. Full-wave inversion can improve conventional seismic resolution and obtain optimized data, improve the ability to evaluate geological resources, thereby determining recoverable areas and making favorable well location suggestions. Since geological exploration targets not only complex surface geological conditions, but also complex underground geological structures, it is very important to improve the inversion accuracy and obtain quantitative reservoir characterization parameters. [0003] Methods such as full waveform inversion and least squares migration require a huge amount of computation. In these methods, multiple ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/36
Inventor 胡光辉王立歆王杰王振宇
Owner CHINA PETROLEUM & CHEM CORP
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