A time-frequency feature analysis of cyclic thin interbeds based on time-frequency analysis of affine class
NIE Wei-Dong1(), LI Xue-Ying1,2(), WAN Qiao-Sheng1, WANG Fu-Lin1, HE Xu-Chao3
1. College of Earth Science,Northeast Petroleum University,Daqing 163318,China 2. Heilongjiang Oil and Gas Reservoir Forming Mechanism and Resource Evaluation Key Laboratory,Northeast Petroleum University,Daqing 163318,China 3. No. 7 Oil Production Company, Daqing Oilfield Company Limited,Daqing 163517,China
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.
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NIE Wei-Dong, LI Xue-Ying, WAN Qiao-Sheng, WANG Fu-Lin, HE Xu-Chao. A time-frequency feature analysis of cyclic thin interbeds based on time-frequency analysis of affine class. Geophysical and Geochemical Exploration, 2020, 44(4): 763-769.
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