基于时频分析叠前地层Q值提取方法研究
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摘要
地震波衰减属性是含气储层预测的重要参数。研究提出了基于时频分析叠前地层Q值提取方法,该方法基于叠前地震资料中丰富的储层信息,利用S变换时频谱具有较高时频分辨率的特征,提高了地层Q值的估算精度。在模型计算和胜利油田垦71工区的实际应用表明,该方法能够较好地预测气层空间展布,在含气区Q值较低,异常现象明显,在非含气区Q值较高,异常现象不明显,尤其是强振幅位置。
Attenuation of seismic waves was one of the important parameters to predict gas reservoir.A new method of Q value extraction was proposed based on the time-frequency analysis of S transforms.Based on prestack seismic data,the high resolution of S transform spectrum technique was used to estimate and imporve the stratigraphic Qvalues.This method was applied in model data and Ken 71 Area of Shengli Oilfield.The calculation results show that the method can be better used to predict the spatial distribution of gas zones and the Qvalues obtained are lower in the gas region,abnormal phenomenon is obvious,but the Qvalues obtained are higher in the no gas region,abnormal phenomenon is not obvious,especially in the strong amplitude position,which provides the effectiveness and applicability of the method.
Attenuation of seismic waves was one of the important parameters to predict gas reservoir.A new method of Q value extraction was proposed based on the time-frequency analysis of S transforms.Based on prestack seismic data,the high resolution of S transform spectrum technique was used to estimate and imporve the stratigraphic Qvalues.This method was applied in model data and Ken 71 Area of Shengli Oilfield.The calculation results show that the method can be better used to predict the spatial distribution of gas zones and the Qvalues obtained are lower in the gas region,abnormal phenomenon is obvious,but the Qvalues obtained are higher in the no gas region,abnormal phenomenon is not obvious,especially in the strong amplitude position,which provides the effectiveness and applicability of the method.
引文
[1]刘祖沅.岩石中地震波衰减的实验研究[J].地震科学研究,1983,(6):34~40.
[2]Quan Youli,Harris J M.Seismic attenuation tomography using the frequency shift method[J].Geophysics,1997,63(3):895~905.
[3]Zhang C J,Ulrychz T J.Estimation of quality factors from CMP record[J].Geophysics,2002,67(5):1542~1547.
[4]李宏兵,赵文智,曹宏,等.小波尺度域含气储层地震波衰减特征[J].地球物理学报,2004,47(5):892~898.
[5]Sun Shengjie.Determination of seismic attenuation from surface and downhole measurements[D].Oklahoma:University of Oklahoma,2000.
[6]Dasgupta R,Clarkz R A.Estimation of Q from surface seismic reflection data[J].Geophysics,1998,63(12):2120~2128.
[7]Hackert C L,Parra J O.Improving Q estimation from seismic reflection data using well-log-based localized spectral correction[J].Geophysics,2004,69(6):1521~1529.
[8]Gao Jinghuai,Yang Senlin.Quality factors estimation using wavelet’s envelope peak instantaneous frequency[J].Geophysics,2009,74:2457~2461.
[9]Stockwell R G,Mansinha L,Lowe R P.Localization of the complex spectrum:The S transform[J].IEEE Transactions on Signal Processing,1996,44(4):998~1001.
[10]邹文.S-变换时频分析技术及其在地震勘探中的应用研究[D].北京:中国地质大学,2005.
[2]Quan Youli,Harris J M.Seismic attenuation tomography using the frequency shift method[J].Geophysics,1997,63(3):895~905.
[3]Zhang C J,Ulrychz T J.Estimation of quality factors from CMP record[J].Geophysics,2002,67(5):1542~1547.
[4]李宏兵,赵文智,曹宏,等.小波尺度域含气储层地震波衰减特征[J].地球物理学报,2004,47(5):892~898.
[5]Sun Shengjie.Determination of seismic attenuation from surface and downhole measurements[D].Oklahoma:University of Oklahoma,2000.
[6]Dasgupta R,Clarkz R A.Estimation of Q from surface seismic reflection data[J].Geophysics,1998,63(12):2120~2128.
[7]Hackert C L,Parra J O.Improving Q estimation from seismic reflection data using well-log-based localized spectral correction[J].Geophysics,2004,69(6):1521~1529.
[8]Gao Jinghuai,Yang Senlin.Quality factors estimation using wavelet’s envelope peak instantaneous frequency[J].Geophysics,2009,74:2457~2461.
[9]Stockwell R G,Mansinha L,Lowe R P.Localization of the complex spectrum:The S transform[J].IEEE Transactions on Signal Processing,1996,44(4):998~1001.
[10]邹文.S-变换时频分析技术及其在地震勘探中的应用研究[D].北京:中国地质大学,2005.
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