用于地震反射界面识别的瞬时相位复合属性
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摘要
复地震道技术采用Hilbert变换通过求解实地震信号的解析信号,可将反映地震信号局部变化情况的地震波的瞬时振幅、瞬时相位和瞬时频率等信息分离开,瞬时相位是一种独立于地震振幅,并且不受其影响的地震属性参数,因此瞬时相位能更好地反映构造几何形态的细节。通过理论模型分析发现,瞬时振幅与极性反转前后地震记录的瞬时相位一阶差分之和进行加权,得到的复合属性可以较为准确、可靠地识别地震反射界面的位置,具有较好的应用效果。
Complex seismic trace technology can be used to solve the analytic signal of the real seismic trace through Hilbert transform,and to separate those seismic attributes such as instantaneous amplitude,instantaneous phase and instantaneous frequency which can reveal the local change of seismic signal.Instantaneous phase is a special seismic attribute,and it is independent of seismic amplitude and is not affected by seismic amplitude.For this reason,it can clearly reveal more details of geological structure.Based on the research of theoretical model,the results show that the composite attribute obtained by added up with first-order differential to instantaneous phase of seismic record before and after polarity reversal and then weighted by instantaneous amplitude can accurately identify the location of reflecting interfaces.
Complex seismic trace technology can be used to solve the analytic signal of the real seismic trace through Hilbert transform,and to separate those seismic attributes such as instantaneous amplitude,instantaneous phase and instantaneous frequency which can reveal the local change of seismic signal.Instantaneous phase is a special seismic attribute,and it is independent of seismic amplitude and is not affected by seismic amplitude.For this reason,it can clearly reveal more details of geological structure.Based on the research of theoretical model,the results show that the composite attribute obtained by added up with first-order differential to instantaneous phase of seismic record before and after polarity reversal and then weighted by instantaneous amplitude can accurately identify the location of reflecting interfaces.
引文
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[5]陈义群,章成广,王军民.复地震道技术在工程物探信号处理中的应用[J].工程地球物理学报,2008,5(1):75.
[6]石颖,刘洪.地震信号的复地震道分析及应用[J].地球物理学进展,2008,23(5):1538.
[7]ROBERTSON J D,NOGAMI H H.Complex seismictrace analysis of thin beds[J].Geophysics,1984,49(4):344.
[2]ARTHUR E BARNES.Theory of 2-D ComplexSeismic Trace Analysis[J].Geophysics,1996,61(1):264.
[3]TANER M T,KOEHLER F,SHERIFF R E.Complexseismic trace analysis[J].Geophysics,1979,44(6):1041.
[4]程乾生.希尔伯特变换与信号的包络,瞬时相位和瞬时频率[J].石油地球物理勘探,1979,14(3):1.
[5]陈义群,章成广,王军民.复地震道技术在工程物探信号处理中的应用[J].工程地球物理学报,2008,5(1):75.
[6]石颖,刘洪.地震信号的复地震道分析及应用[J].地球物理学进展,2008,23(5):1538.
[7]ROBERTSON J D,NOGAMI H H.Complex seismictrace analysis of thin beds[J].Geophysics,1984,49(4):344.
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