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Time-Frequency Analysis and Attenuation Estimation Method of Seismic Data Based on Synchrosqueezing Transformation

A time-frequency analysis and seismic data technology, applied in seismic signal processing and other directions, can solve the problems of time-frequency resolution decline, signal energy diffusion, etc., and achieve the effect of improving time-frequency resolution

Active Publication Date: 2017-04-26
XI AN JIAOTONG UNIV
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Problems solved by technology

[0009] However, the traditional time-frequency analysis methods, such as short-time Fourier transform and wavelet transform, have limitations when used in time-frequency analysis of seismic signals, which is mainly reflected in the influence of time-frequency atoms on the time-frequency plane of the signal. Energy Spread and Decrease in Time-Frequency Resolution

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  • Time-Frequency Analysis and Attenuation Estimation Method of Seismic Data Based on Synchrosqueezing Transformation

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Embodiment Construction

[0057] Below by specific embodiment and accompanying drawing, the scheme of the present invention is described in detail:

[0058] The used tool Synchrosqueezing transformation of the present invention specifically comprises the following steps:

[0059] Step a: Continuous wavelet transform

[0060] Signal The time domain and frequency domain of the wavelet transform are expressed as

[0061]

[0062] Where ψ(t) is the basic wavelet, a and b are scale factor and translation factor respectively, F(ω) and Ψ(ω) are Fourier transforms of f(t) and ψ(t).

[0063] Here, it is assumed that the wavelet function has almost no negative frequency components, that is, when ω0 nearby. Such as figure 1 As shown in (a), take a single-frequency cosine signal h(t)=Acos(Ωt), where A=1, Ω=100π as an example, the result of the wavelet transform is

[0064]

[0065] After wavelet transform, the energy of the cosine signal h(t) surrounds the scale a=ω in the time-scale plane 0 The strai...

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Abstract

The invention discloses a seismic data time-frequency analysis and attenuation estimation method based on Synchrosqueezing transform. A new time-frequency analysis tool Synchrosqueezing transform is first used for seismic data time-frequency analysis, more aggregated time-frequency representation is obtained through the rearrangement of transform domain coefficients, the time-frequency resolution is greatly improved, the obtained time-frequency representation is used for actual seismic data analysis and tight sandstone model gas bearing detection, the location of a reservoir can be accurately defined, the geological structure like a river channel, a fault and the like can be indicated, and further material interpretation and well location determination are facilitated. The invention provides the seismic attenuation estimation method based on the Synchrosqueezing transform and gives a specific implementation process, the attenuation estimation results of three-dimensional data of an oilfield tight sandstone reservoir and drilling results have a good consistency, and the method can be used for helping geologists to indicate a gas bearing reservoir and determine a drilling location.

Description

technical field [0001] The invention belongs to the field of signal processing in geophysical exploration, relates to time-frequency analysis of seismic data and estimation of seismic attenuation, in particular to a method for time-frequency analysis and attenuation estimation of seismic data based on Synchrosqueezing transformation. Background technique [0002] Seismic signals are complex non-stationary signals. Time-frequency analysis can be used to describe the variation of seismic signals over time, describe the local characteristics of seismic signals, and reflect the geological structure and reservoir information corresponding to these characteristics. Therefore, time-frequency analysis is an important means of seismic data processing and interpretation. With the development of modern signal processing theory, a large number of time-frequency analysis tools and methods have emerged, many of which are also applied in seismic signal analysis. [0003] After the seismic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 高静怀王平
Owner XI AN JIAOTONG UNIV
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