正弦波拟合算法的薄互层解释
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摘要
针对中国陆相沉积油层大多为薄互层的特点,根据薄互层的调谐效应物理特征,提出了采用正弦波拟合算法估计地震道频率的方法.理论模型算例和实际资料分析证明该方法对横向追踪和纵向识别薄互层是有效的.与复地震道相位求导、短时傅里叶变换、Cohen类方法相比,正弦波拟合算法估计局部数据频率具有良好的抗噪能力和分辨率.
Considering that majority of the Chinese continental reservoirs are thin inter-breeds,and based on the physical character of syntony effect of thick inter-breeds,the SinFit method is adopted to estimate the frequency of seismic trace.The method can to give more accurate and robust frequency estimates than three other common methods as phase derivative of complex trace,short time Fourier transform and Cohen class on a set of test traces where the true frequency components are known,and shows the good antinoise and high resolution.In processing the practical seismic data,the method is effectively proved to show the reservoir bed in horizontal direction and the thin inter-breeds in vertical direction.
Considering that majority of the Chinese continental reservoirs are thin inter-breeds,and based on the physical character of syntony effect of thick inter-breeds,the SinFit method is adopted to estimate the frequency of seismic trace.The method can to give more accurate and robust frequency estimates than three other common methods as phase derivative of complex trace,short time Fourier transform and Cohen class on a set of test traces where the true frequency components are known,and shows the good antinoise and high resolution.In processing the practical seismic data,the method is effectively proved to show the reservoir bed in horizontal direction and the thin inter-breeds in vertical direction.
引文
[1]毛宁波.陆相地层隐蔽油气研究[M].成都:成都理工大学出版社,2002.32~35.
[2]Taner M T,Koehler F,Sheriff R E.Complex seismic traceanalysis[J].Geophysics,1979,44(6):1 041~1 063.
[3]Barnes E.Instantaneous spectral bandwidth and dominantfrequency with applications to seismic reflection data[J].Geophysics,1993,58(3):419~428.
[4]Cohen L.Time-frequency distributions A review[J].Proceedings of the IEEE,1989,77(7):941~981.
[5]Press W E,Teulolsky S A,Vetterling W T,Flannery BP.C语言数值算法程序大全(第2版)[M].傅祖芸,赵梅娜,丁岩等译.北京:电子工业出版社,1995.
[6]Hardy H,Beier A,Gaston J D.Frequency estimates ofseismic traces[J].Geophysics,2003,68(1):370~380.
[2]Taner M T,Koehler F,Sheriff R E.Complex seismic traceanalysis[J].Geophysics,1979,44(6):1 041~1 063.
[3]Barnes E.Instantaneous spectral bandwidth and dominantfrequency with applications to seismic reflection data[J].Geophysics,1993,58(3):419~428.
[4]Cohen L.Time-frequency distributions A review[J].Proceedings of the IEEE,1989,77(7):941~981.
[5]Press W E,Teulolsky S A,Vetterling W T,Flannery BP.C语言数值算法程序大全(第2版)[M].傅祖芸,赵梅娜,丁岩等译.北京:电子工业出版社,1995.
[6]Hardy H,Beier A,Gaston J D.Frequency estimates ofseismic traces[J].Geophysics,2003,68(1):370~380.
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