时频分析技术及其在识别含气层中的应用——以川中某地区雷口坡组雷3含气层为例
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摘要
针对Wigner-Ville变换中交叉项对信号时频分析的分辨率有较大的干扰,采用改进了的平滑Wigner-Ville变换处理技术,来分析雷克子波合成记录的时频特征,能够提高时频分析在时间和频率上的分辨率。在实际应用中首先对川中某地区井旁雷口坡组的地震道做频谱分析,统计其主要频率分布,然后提取地震分频剖面,研究分频剖面与实测含气层和气测异常层之间的对应关系,结果表明,该区由含气引起的强振幅(能量)主要集中在30~40Hz频率段,与实测井含气层能够较好地相对应。
Aimed at Wigner-Ville transformation crossterms badly interfering signals' resolution in the time-frequency analysis, the improved smoothed Wigner-Ville transformation is employed to analyze the time-frequency characteristics of the Ricker wavelet synthesis record. It is proved that it can improve the time-frequency analysis in the time and frequency resolution. This method is used to spectral decomposition technology. First, the spectrum analysis was used to analyze the near well Leikoupo Formation in central Sichuan and to analyze its main frequency distribution, then the seismic spectral decomposition profiles were extracted, and finally, the corresponding relationship between the seismic spectral decomposition profiles and the practically measured gas reservoirs or gas abnormity was analized. The results show that the strong amplitude (energy) caused by gas is mainly concentrated in the frequencies of 30-40Hz, and it matches very well with the practically measured wells.
Aimed at Wigner-Ville transformation crossterms badly interfering signals' resolution in the time-frequency analysis, the improved smoothed Wigner-Ville transformation is employed to analyze the time-frequency characteristics of the Ricker wavelet synthesis record. It is proved that it can improve the time-frequency analysis in the time and frequency resolution. This method is used to spectral decomposition technology. First, the spectrum analysis was used to analyze the near well Leikoupo Formation in central Sichuan and to analyze its main frequency distribution, then the seismic spectral decomposition profiles were extracted, and finally, the corresponding relationship between the seismic spectral decomposition profiles and the practically measured gas reservoirs or gas abnormity was analized. The results show that the strong amplitude (energy) caused by gas is mainly concentrated in the frequencies of 30-40Hz, and it matches very well with the practically measured wells.
引文
[1]Steeghs T P H,et al.Local Power Spectra and Seismic Inter-pretation[M].Doctoral Dissertation:Delft University of Tech-nology,1997.
[2]Cohen L.Ti me-Frequency Analysis[M].NewJersey:Prentice-Hall,Englewood Cliffs,1995.
[3]Tagluka ME,Cakmakb E D.Analysis of the ti me-varying en-ergy of brain responses to an oddball paradigm using short-termsmoothed Wigner-Ville distribution[J].Journal of Neuro-science Methods,2005,143(3):197-208.
[4]张延章,尹寿鹏,张巧玲,等.地震分频技术的地质内涵及其效果分析[J].石油勘探与开发,2006,33(1):64-71.
[5]周金保.沉积微相研究成果在濮城油气田滚动勘探中的应用[J].石油勘探与开发,2004,31(4):68-70.
[6]郭晓龙,欧阳永林,张秀平,等.小波变化参数在苏里格气田的实际应用[J].天然气地球科学,2007,18(3):418-421.
[7]胡光义,王加瑞,武士尧,等.利用地震分频处理技术预测河流相储层[J].中国海上油气,2005,17(4):237-241.
[8]魏国齐,刘德来,张林,等.四川盆地天然气分布规律与有利勘探领域[J].天然气地球科学,2005,16(4):437-442.
[9]雷雪,李忠,翟中华,等.川中地区中三叠统雷口坡组构造特征及解释方法探讨[J].石油物探,2005,44(2):137-141.
[2]Cohen L.Ti me-Frequency Analysis[M].NewJersey:Prentice-Hall,Englewood Cliffs,1995.
[3]Tagluka ME,Cakmakb E D.Analysis of the ti me-varying en-ergy of brain responses to an oddball paradigm using short-termsmoothed Wigner-Ville distribution[J].Journal of Neuro-science Methods,2005,143(3):197-208.
[4]张延章,尹寿鹏,张巧玲,等.地震分频技术的地质内涵及其效果分析[J].石油勘探与开发,2006,33(1):64-71.
[5]周金保.沉积微相研究成果在濮城油气田滚动勘探中的应用[J].石油勘探与开发,2004,31(4):68-70.
[6]郭晓龙,欧阳永林,张秀平,等.小波变化参数在苏里格气田的实际应用[J].天然气地球科学,2007,18(3):418-421.
[7]胡光义,王加瑞,武士尧,等.利用地震分频处理技术预测河流相储层[J].中国海上油气,2005,17(4):237-241.
[8]魏国齐,刘德来,张林,等.四川盆地天然气分布规律与有利勘探领域[J].天然气地球科学,2005,16(4):437-442.
[9]雷雪,李忠,翟中华,等.川中地区中三叠统雷口坡组构造特征及解释方法探讨[J].石油物探,2005,44(2):137-141.
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