基于affine类时频分析的旋回性薄互层时频特征影响因素分析

doi:10.11720/wtyht.2020.1406

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Abstract

The affine time-frequency analysis method has the characteristics of fuzzy instantaneous spectral changes,highlights the characteristics of the main frequency variation trend,and has a good capability for determining the degree of cycle.Therefore,it has been used by experts in the classification of cyclic thin interbed types.The layer time domain waveforms are characterized by dense waveforms toward the thin layer and sparse waveforms in the thick layer direction,but their poor stability is susceptible to external interference.The time-spectrum obtained from the affine class time-frequency distribution has a one-to-one correspondence with the sedimentary cycle pattern.The frequency rising characteristics of thin interbeds in different model cycles are in the direction of thickness thinning.As the study of the influencing factors of cyclic interbeds characteristics in the current time is very insufficient,it is important to clarify the influence of these factors on the criterion of the cycle.Based on the above considerations,this paper discusses the influence of the sudden change in the thickness of the small layer,the size of wave impedance,the influence of noise,the size of seismic data frequency and the viscous absorption of the formation on the cycle discrimination based on the positive cycle model.Firstly,according to the wave theory,the depth-domain phase-shift method is used to make forward simulation of the cyclic thin interbeds with different influencing factors,and zero-offset gathers is extracted for affine time-frequency analysis;after that,the differences of time-frequency characteristics of cyclic thin interbeds are compared under ideal conditions.The results show that affine time-frequency distribution has a strong capability for discriminating sedimentary cycles against noise,and is less affected by slight sudden changes in the thickness of thin interbeds,that the variation of wave impedance mainly affects the temporal energy distribution of time-frequency spectrum,but has little effect on the energy distribution of frequency-direction,and that the variation of main frequency of seismic data has little effect on the time-frequency characteristics,whereas the variation of main frequency of seismic data has little effect on the time-frequency characteristics.With the increase of main frequency of wave,the trend of cycle is more obvious,the influence of stratigraphic viscous absorption on the accuracy of this method is also small,and the time-frequency characteristics are stable.

Key words： affine class cyclic thin interbeds time-frequency analysis forward modeling viscous absorption

Received: 23 August 2019 Published: 28 August 2020

P631.4

Corresponding Authors: LI Xue-Ying E-mail: 1581054447@qq.com;lxy8403@sina.com

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	Wei-Dong NIE
	Xue-Ying LI
	Qiao-Sheng WAN
	Fu-Lin WANG
	Xu-Chao HE

Cite this article:

Wei-Dong NIE,Xue-Ying LI,Qiao-Sheng WAN, et al. A time-frequency feature analysis of cyclic thin interbeds based on time-frequency analysis of affine class[J]. Geophysical and Geochemical Exploration, 2020, 44(4): 763-769.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1406 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I4/763

Typical affine time-frequency distributions of positive cyclic mode

Time domain waveforms and time-frequency distributions of random variation of inner layer thickness in positive cycle background

Time domain waveforms and time-frequency distributions after change of reflection coefficient with same thickness

Normalized instantaneous spectrum at different time

Time-domain waveforms and time-frequency distributions of different noise intensities

Time-domain waveforms and time-frequency distributions of seismic data with different main frequencies

Time-domain waveforms and time-frequency distributions of different viscous formations

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