Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (5): 76-80.doi: 10.3969/j.issn.1673-8926.2013.05.013

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Application of time-frequency analysis technology to the gas detection in Sulige area

ZHANG Menggang1， HONG Zhong1， DOU Yutan1， CUI Xiaojie2   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest， Lanzhou 730020， China； 2. Research Institute of Exploration and Development， PetroChina Changqing Oilfield Company， Xi’an 710018， China
  • Online:2013-09-26 Published:2013-09-26

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Abstract:

When seismic waves get through gas reservoir, the energy of high frequency will be attenuated. So we can predict oil reservoir by energy of high frequency. Firstly, through the comparison of the four spectrum decomposition algorithm: short-time Fourier transform, wavelet transform, generalized S transform and matching pursuit decomposition, we proved that matching pursuit decomposition method has higher time-frequency resolution. Secondly, we verified that the energy of high frequency will be attenuated when seismic waves get through gas reservoir. Finally, the matching pursuit decomposition method was applied to spectrumdecomposition of 3D seismic prospect in Sulige area. Meanwhile, high frequency attenuation was used to predict the gas-bearing properties, and the result is in accordance with actual
drilling data, which proves the practicability of this method.

Key words: unconformity type, hydrocarbon migration, hydrocarbon accumulation

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