基于时频域谱模拟的时变子波估计方法
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摘要
为解决地层衰减作用造成传统子波提取方法提取结果不准确的问题,提出了一种基于时频谱模拟的时变子波估计方法。首先对非平稳地震记录进行改进的广义S变换后再作时频滤波处理,然后采用谱模拟方法从处理后的地震记录时频谱中拟合出每一时刻的子波振幅谱,最后通过反傅里叶变换得到时域子波,从而实现时变子波的精确提取。与常规分段提取时变子波方法相比,该方法不需要子波分段平稳的假设,当相邻层段子波属性存在较大变化时也能准确估计出时变子波。理论分析和模型试算结果表明,该方法在提取时变子波并用于提高地震资料分辨率方面具有一定的可行性和有效性。
To solve the problem that the seismic wavelet estimated by conventional methods is inaccurate because of the effect of earth-attenuation,a time-variant seismic wavelet estimation method based on spectral modeling in time-frequency domain is proposed.At first,the non-stationary seismic record is transformed by the improved generalized S-transformation and followed by time-frequency filtering processing.And then the wavelet amplitude spectrum for each moment is fitted from the time-frequency spectrum of processed seismic record using spectral modeling method.Finally,after inverse Fourier transformation,the time-variant wavelet is achieved with high accuracy.Compared with conventional segmented extracting methods of time-variant wavelet,the proposed method can be also used to estimate time-variant wavelet accurately when the seismic wavelet properties varied obviously in adjacent stratum.Theoretical analysis and simulation results show that the method is feasible and effective in extracting time-varying wavelet and improving the resolution of seismic data.
引文
[1]胡启宇.同态反褶积的一种可能途径[J].石油物探,1984,23(2):109-111Hu Q Y.A possible way for hommorphic deconvolution[J].Geophysical Prospecting for Petroleum,1984,23(2):109-111
    [2]Liang G H,Cai X P,Li Q Y.Using high-order cumulants to extrapolate spatially variant seismic wavelets[J].Geophysics,2002,67(6):1869-1876
    [3]彭才,朱仕军,黄中玉,等.基于动态褶积模型的动态子波估计[J].石油物探,2007,46(4):224-328Peng C,Zhu S J,Huang Z Y,et al.Dynamic wavelet estimation based on the dynamic convolution model[J].Geophysical Prospecting for Petroleum,2007,46(4):224-328
    [4]彭才,曾涛,常智,朱仕军.混合相位动态子波估计[J].油气地球物理,2008,6(1):21-24Peng C,Zeng T,Chang Z,et al.Estimation of mixedphase nonstationary wavelet[J].Petroleum Geophysics,2008,6(1):21-24
    [5]Mirko van der B.Time-varying wavelet estimation and deconvolution by kurtosis maximization[J].Geophysics,2008,73(2):11-18
    [6]高静怀,汪玲玲,赵伟.基于反射地震记录变子波模型提高地震记录分辨率[J].地球物理学报,2009,52(5):1289-1300Gao J H,Wang L L,Zhao W.Enhancing resolution of seismic trances based on the changing wavelet model of the seismogram[J].Chinese Journal of Geophysics,2009,52(5):1289-1300
    [7]冯晅,刘财,杨宝俊,等.分时窗提取地震子波及在合成地震记录中的应用[J].地球物理学进展,2002,17(1):71-77Feng X,Liu C,Yang B J.The extractive method of seismic wavelet in different time window and the application in synthetic seismogram[J].Progress in Geophysics,2002,17(1):71-77
    [8]高静怀,陈文超,李幼铭,等.广义S变换与薄互层地震响应分析[J].地球物理学报,2003,46(4):526-532Gao J H,Chen W C,Li Y M,et al.Generalized S transform and seismic response analysis of thin interbeds[J].Chinese Journal of Geophysics,2003,46(4):526-532
    [9]Stockwell R G.A basis for ef digital signal processing of the S-transform[J].Digital Signal Processing,2006:1-22
    [10]Ervin S,Djurovi L,Jin J.A window width optimized S-transform[J].EURASIP Journal on Advances in Signal Processing,28(1):1-13
    [11]齐春艳,李彦鹏,彭继新,等.一种改进的广义S变换[J].石油地球物理勘探,2010,45(2):215-218Qi C Y,Li Y P,Peng J X,et al.An improved generalized S-transform[J].Oil Geophysical Prospecting,2010,45(2):215-218
    [12]张贤达.现代信号处理[M].第2版.北京:清华大学出版社,2002:360-362Zhang X D.Modern signal processing[M].2nd ed.Beijing:Tsinghua University Press,2002:360-362
    [13]Tian J,Song W,Yang F.Enhancing the resolution of seismic data based on the generalized S-transform[J].Petroleum Science,2009,6:153-157
    [14]高静怀,张兵.基于时频滤波的吸收衰减参数估算[J].石油地球物理勘探,2012,47(6):931-936Gao J H,Zhang B.Seismic attenuation parameter estimation based on the time-frequency filtering[J].Oil Geophysical Prospecting,2012,47(6):931-936
    [15]Rosa A L,Ulrych T J.Processing via spectral modeling[J].Geophysics.1991,56(8):1244-1251
    [16]孙成禹.谱模拟方法及其在提高地震资料分辨率中的应用[J].石油地球物理勘探,2000,35(1):27-35Sun C Y.Spectrum modeling method and its application to seismic resolution improvement[J].Oil Geophysical Prospecting,2000,35(1):27-35
    [17]唐博文,赵波,吴艳辉,等.一种实现谱模拟反褶积的新途径[J].石油地球物理勘探,2010,45(增刊1):66-70Tang B W,Zhao B,Wu Y H,et al.A new method for spectral-modeled deconvolution[J].Oil Geophysical Prospecting,2010,45(S1):66-70

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