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Synchronous extrusion and transformation-based earthquake weighting average instantaneous frequency extracting method

An instantaneous frequency, weighted average technique used in signal processing in geophysical exploration

Inactive Publication Date: 2017-01-04
XI AN JIAOTONG UNIV
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Problems solved by technology

However, there is no recognized classification of seismic attributes. According to the physical meaning, seismic attributes can be divided into several categories such as time, amplitude, frequency, coherence, and attenuation. According to the attribute picking method, each category can be divided into instantaneous attributes, single-channel Time window attribute, multi-channel time window attribute

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  • Synchronous extrusion and transformation-based earthquake weighting average instantaneous frequency extracting method
  • Synchronous extrusion and transformation-based earthquake weighting average instantaneous frequency extracting method
  • Synchronous extrusion and transformation-based earthquake weighting average instantaneous frequency extracting method

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Embodiment

[0110] (1) Composite signal calculation example

[0111] We study synthetic seismic records generated by convolving 30 Hz Ricker wavelets with reflection coefficient sequences. figure 2 (a) is a synthetic record without noise, (b), (c), and (d) are respectively the instantaneous frequency calculated by Hilbert transform, the weighted instantaneous frequency calculated based on Fourier transform and the present invention. It can be seen that the instantaneous frequency estimation results of (b) and (c) fluctuate greatly and are not stable enough; the estimation result of the present invention is more stable, and the instantaneous frequency is mainly distributed around the Ricker wavelet main frequency of 30Hz and within the range of 20Hz-40Hz.

[0112] image 3 (a) is to add the noise-containing record (signal-to-noise ratio SNR=5dB) of Gaussian white noise, (b), (c), (d) are respectively the instantaneous frequency calculated by Hilbert transform, calculated based on Fourier...

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Abstract

The invention discloses a synchronous extrusion and transformation-based earthquake weighting average instantaneous frequency extracting method. On the basis of three-parameter wavelet transformation, energy rearrangement is conducted by evaluating a rearrangement rule (instantaneous frequency) to obtain more accurate and sparser time frequency representation, so that an effective signal energy distribution space is determined accurately; on this basis, threshold de-noising is introduced to perform noise suppression; finally a method for evaluating noise-containing signal weighing instantaneous frequency is provided. The calculation result of the method has high noise-resistant performance and precision by calculating the instantaneous frequency of noise-free and noise-containing synthetic seismic record and comparing the noise-resistant performance of different methods; when the method is applied to actual data, the characteristic of a reservoir stratum can be clearly described.

Description

technical field [0001] The invention belongs to the field of signal processing in geophysical exploration, in particular to a method for extracting seismic weighted average instantaneous frequency based on synchronous squeeze transformation. Background technique [0002] Seismic attributes refer to the geometric shape, kinematics, dynamics, and statistics of seismic waves derived from seismic data through mathematical transformation. These features can be used to predict subsurface lithology and describe reservoir characteristics, etc. Played a great role in the process of seismic data processing. In the 1970s, seismic attribute analysis was introduced into seismic interpretation. Since the 1990s, due to the need for reservoir description and three-dimensional data volume interpretation, seismic attribute analysis technology has developed rapidly. However, there is no recognized classification of seismic attributes. According to the physical meaning, seismic attributes can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/34
CPCG01V1/307G01V1/345G01V2210/63G01V2210/74
Inventor 高静怀刘乃豪周清保姜秀娣王前王平
Owner XI AN JIAOTONG UNIV
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