Time-Frequency Analysis and Its Application in Gas-Bearing Reservoirs: A Case from theLei 3 Gas-Bearing Reservoir of Leikoupo Formation in a Area of Central Sichuan
(College of Information Engineering, Chengdu University of Technology, Chengdu 610059, China)
Received date: 2007-09-25
Revised date: 2008-01-14
Online published: 2008-04-10
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30~40 Hz频率段，与实测井含气层能够较好地相对应。
关键词： 平滑Wigner-Ville变换; 时频分析; 分频技术; 雷口坡组; 含气层
田仁飞，曹俊兴，方磊 . 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[J]. 天然气地球科学, 2008 , 19(2) : 272 -275 . DOI: 10.11764/j.issn.1672-1926.2008.02.272
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.
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