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Method and device for widening frequency band of seismic data

A technology of seismic data and frequency bands, applied in the field of seismic exploration data processing, can solve the problems of multiple high-frequency noises and expanded bandwidths less than one octave, so as to maintain main frequency characteristics, avoid artifacts and high-frequency noises, and reduce The effect of signal distortion

Active Publication Date: 2019-08-27
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

In general, these methods have two disadvantages: one is to introduce quite a lot of high-frequency noise; the other is that the expanded bandwidth is generally less than one octave

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  • Method and device for widening frequency band of seismic data
  • Method and device for widening frequency band of seismic data
  • Method and device for widening frequency band of seismic data

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[0046] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0047] In the field of signal processing, the conversion of signals between the time domain and the frequency domain can be realized through Fourier transform and inverse Fourier transform. In the frequency domain, a typical use of the Fourier transform is to decompose the signal into an amplitude spectrum-displaying the magnitude of the amplitude corresponding to the frequency. The horizontal axis is generally the frequency and the vertical...

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Abstract

A method of widening an earthquake data frequency band and an apparatus thereof are disclosed. The method comprises the following steps of step1, carrying out Fourier transform on time-domain single channel earthquake data and acquiring frequency-domain single channel earthquake data; step2, calculating an amplitude of the frequency-domain single channel earthquake data; step3, carrying out fitting and smoothing processing on the amplitude so as to acquire a fitting curve, and calculating a maximum value of the fitting curve; step4, based on the fitting curve and the maximum value of the fitting curve, calculating a single channel frequency expanding filtering operator; step5, in a frequency domain, based on the single channel frequency expanding filtering operator, calculating the frequency-domain single channel earthquake data after the frequency expanding; and step6, carrying out inverse Fourier transform on the frequency-domain single channel earthquake data after the frequency expanding. In the invention, simultaneous widening of a high frequency terminal and a low frequency terminal can be realized; through a frequency expanding control factor, frequency expanding can be effectively controlled, and an illusion and a high frequency noise are avoided. In addition, a frequency spectrum of original data is used as a constraint, a main frequency characteristic of an original signal can be maximumly maintained and a signal distortion is reduced.

Description

technical field [0001] The present disclosure relates to the technical field of seismic exploration data processing, in particular to a method and device for widening the frequency band of seismic data. Background technique [0002] In seismic exploration, the spectrum analysis of seismic data is one of the important means in modern signal processing and analysis. Spectrum analysis refers to unfolding the signal strength sent by the signal source in order of frequency, making it a function of frequency, and examining the change law. The purpose of transforming the time-domain signal into the frequency domain is to decompose the complex time-history waveform into several single harmonic components through Fourier transform for research, so as to obtain the frequency structure of the signal and the information of each harmonic and phase. [0003] Resolution is the ability to resolve detailed features of a given seismic profile. For 3D seismic data, seismic data resolution in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 王小青许自龙曹永生杨尚琴陈金焕陈海洋
Owner CHINA PETROLEUM & CHEM CORP
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