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Seismic data time-frequency analysis method based on second-order extrusion wavelet transformation

A technology of wavelet transform and time-frequency analysis, applied in the field of seismic exploration

Active Publication Date: 2017-09-05
XI AN JIAOTONG UNIV
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However, this algorithm also has certain limitations, and it can only achieve better results when analyzing multi-component signals superimposed by several narrowband signals.

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  • Seismic data time-frequency analysis method based on second-order extrusion wavelet transformation
  • Seismic data time-frequency analysis method based on second-order extrusion wavelet transformation
  • Seismic data time-frequency analysis method based on second-order extrusion wavelet transformation

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Embodiment Construction

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described herein are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0050] The seismic data time-frequency analysis method based on the second-order synchrosqueezing wavelet transform proposed by the present invention specifically includes the following steps:

[0051] The second-order synchrosqueezing wavelet transform includes the following steps:

[0052]Step 1: Perform continuous wavelet transform on the signal to obtain the wavelet transform spectrum W(a,b), and the time domain and frequency domain expressions of W(a,b...

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Abstract

The invention discloses a seismic data time-frequency analysis method based on second-order extrusion wavelet transformation. Firstly, a second-order synchronous extrusion operator is introduced on the basis of continuous wavelet transformation, the transformation is rearranged in a time-scale domain according to wavelet transformation coefficients, accordingly energy diffusion is pressed, and analysis results higher in time-frequency resolution ratio can be obtained by adopting the method. Compared with existing synchronous extrusion transformation, the method is more suitable for analysis of seismic signals having stronger frequency modulation, thus the signals are applied to time-frequency analysis of actual seismic data, the boundary of an underground carbon and hydrogen reservoir can be more accurately defined, riverways, faults and other geological information can be more elaborately depicted, and accordingly further seismic data explanation and well position determination are promoted.

Description

[0001] 【Technical field】 [0002] The invention belongs to the technical field of seismic exploration, and relates to a time-frequency analysis method of seismic data based on second-order squeezing wavelet transform. [0003] 【Background technique】 [0004] Due to the attenuation and filtering effect of the underground medium in the process of seismic wave propagation, seismic signals are typical non-stationary signals. The traditional Fourier transform does not have the ability to describe the local frequency of the signal, while the time-frequency analysis can be used to describe the variation of the seismic signal over time, describe the local characteristics of the seismic signal, and reflect the geological structure and reservoir information corresponding to these characteristics , so the time-frequency transform method is an ideal tool for analyzing non-stationary signals. Constructing or selecting an appropriate time-frequency analysis tool is one of the key issues in ...

Claims

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624G01V2210/62
Inventor 高静怀王前张茁生
Owner XI AN JIAOTONG UNIV
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