气层在纵波和转换波谱分解中的特征(英文)
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摘要
应用拟合追逐分解MPD(Matching pursuit decomposition)法对地震数据进行谱分解能够提供更好的分辨率,在时间分辨率和频率分辨率上到达一致,避免付氏变换方法中时窗大小选择和分析时间点不准确的问题。含气地层对纵波资料产生较大的频率衰减,在储层下方可能见到低频强振幅的低频阴影现象。而转换波资料受气藏影响小,在转换波剖面中不会出现同纵波类似的低频阴影区。因此,综合两种资料在分频剖面上的表现,可以进行含气性异常的预测。对已知气藏的实际多波地震资料,进行MPD分频处理,在不同波场的分频剖面上,分析气层响应特征。
Spectral decomposition using the method of Matching Pursuit Decomposition (MPD) for PP- and PS-wave data has higher resolution and higher consistency over the entire time-frequency plane. The MPD algorithm avoids the problems of inaccurate analytic time point and the time window size choice that may occur during a Fourier transform. The PP-wave attenuation is greater than the PS-wave attenuation while propagating through gas reservoirs. There are some stronger amplitude low-frequency shadows on the PP-wave single frequency sections beneath gas reservoirs which are not seen on corresponding PS-wave single frequency sections. Therefore, hydrocarbons are predicted from comparing the behavior on both frequency sections. The time-frequency analysis for multi-component data is decomposed by MPD for data from northeast China containing rich gas reservoirs. The gas response character is analyzed on different wave mode single frequency sections. We describe the MPD algorithm, compare it to other spectral decomposition methods, and show some examples of detecting low-frequency shadows beneath gas reservoirs.
Spectral decomposition using the method of Matching Pursuit Decomposition (MPD) for PP- and PS-wave data has higher resolution and higher consistency over the entire time-frequency plane. The MPD algorithm avoids the problems of inaccurate analytic time point and the time window size choice that may occur during a Fourier transform. The PP-wave attenuation is greater than the PS-wave attenuation while propagating through gas reservoirs. There are some stronger amplitude low-frequency shadows on the PP-wave single frequency sections beneath gas reservoirs which are not seen on corresponding PS-wave single frequency sections. Therefore, hydrocarbons are predicted from comparing the behavior on both frequency sections. The time-frequency analysis for multi-component data is decomposed by MPD for data from northeast China containing rich gas reservoirs. The gas response character is analyzed on different wave mode single frequency sections. We describe the MPD algorithm, compare it to other spectral decomposition methods, and show some examples of detecting low-frequency shadows beneath gas reservoirs.
引文
Castagna, J. P., Sun, S., and Siegfried, R. W., 2003, Instantaneous spectral analysis: Detection of low-frequency shadows associated with hydrocarbons: The Leading Edge, 22 (2), 120 - 127.
Chakraborty, A., and Okaya, D., 1995, Frequency-time decomposition of seismic data using wavelet-based methods: Geophysics, 60 (6), 1906-1916.
Chapman, M., Liu, E., and Li, X. Y., 2005, The effects of abnormally high attenuation on AVO signatures: The Leading Edge, 24 (11), 1120 - 1125.
Ebrom, D., 1996, The low-frequency gas shadow on seismic section: SEG/EAGE Summer Research Workshop 'Wave Propagation in Rocks', Big Sky, Montana, 4-8 August.
Ebrom, D., 2004, The low-frequency gas shadow on seismic sections: The Leading Edge, 23(8), 772.
Huang, Z.Y., Wang, Y.J., and Su, Y.C., 2000, A new seismic attenuation analysis method: Oil Geophysical prospecting, 35(6), 768-773.
Liu, E., Chapman, M., Loizou, N., and Li, X. Y., 2006, Applications of spectral decomposition for AVO analyses in the west of Shetland: 76th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 279-283.
Mallat, S., and Zhand, Z., 1993, Matching pursuit with time frequency dictionarities: IEEE Trans. Signal prec, 41, 3397-3415.
Martin, N. W., Azavache, A., and Donati, M. S., 1998, Indirect oil detection by using P-wave attenuation analysis in Eastern Venezuela Basin: 68th Annual Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 914-917.
Mitchell, J. T., Derzhi, N., Lichman, E., and Lanning, E. N., 1996, Energy absorption analysis: A case study. 66th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1785- 1788.
Wang, X.W., 2004, Wavelet analysis in processing and interpretation of seismic data: China Petroleum Industry Press.
Chakraborty, A., and Okaya, D., 1995, Frequency-time decomposition of seismic data using wavelet-based methods: Geophysics, 60 (6), 1906-1916.
Chapman, M., Liu, E., and Li, X. Y., 2005, The effects of abnormally high attenuation on AVO signatures: The Leading Edge, 24 (11), 1120 - 1125.
Ebrom, D., 1996, The low-frequency gas shadow on seismic section: SEG/EAGE Summer Research Workshop 'Wave Propagation in Rocks', Big Sky, Montana, 4-8 August.
Ebrom, D., 2004, The low-frequency gas shadow on seismic sections: The Leading Edge, 23(8), 772.
Huang, Z.Y., Wang, Y.J., and Su, Y.C., 2000, A new seismic attenuation analysis method: Oil Geophysical prospecting, 35(6), 768-773.
Liu, E., Chapman, M., Loizou, N., and Li, X. Y., 2006, Applications of spectral decomposition for AVO analyses in the west of Shetland: 76th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 279-283.
Mallat, S., and Zhand, Z., 1993, Matching pursuit with time frequency dictionarities: IEEE Trans. Signal prec, 41, 3397-3415.
Martin, N. W., Azavache, A., and Donati, M. S., 1998, Indirect oil detection by using P-wave attenuation analysis in Eastern Venezuela Basin: 68th Annual Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 914-917.
Mitchell, J. T., Derzhi, N., Lichman, E., and Lanning, E. N., 1996, Energy absorption analysis: A case study. 66th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1785- 1788.
Wang, X.W., 2004, Wavelet analysis in processing and interpretation of seismic data: China Petroleum Industry Press.
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