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
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.
TIAN Ren-fei，CAO Jun-xing，FANG Lei . 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[J]. Natural Gas Geoscience, 2008 , 19(2) : 272 -275 . DOI: 10.11764/j.issn.1672-1926.2008.02.272
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