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Global Geology 2014, 17(4) 243-246 DOI:
ISSN: 1673-9736 CN: 22-1371/P |
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Application of spectral decomposition technology in shallow gas detection based on Wigner- Ville distribution |
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CHI Huanzhao, LIU Cai, SHAN Xuanlong, WANG Dian and LU Qi |
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1． College of Earth Sciences，Jilin University，Changchun 130061，China; 2． College of Geo- Exploration Science and Technology，Jilin University，Changchun 130026，China |
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Abstract：
Shallow gas is composed of all kinds of shallow buried natural gas resources ( ＜1500 m) with rela- tively small reserve for each gas resource． It has some advantages such as shallow burial depth，good physical properties and the huge accumulations． Based on the Wigner- Vill distribution，a general spectral decomposition method is applied in the shallow gas detection． Cone- shaped kernel function filtering method is used to suppress cross- terms of the Wigner- Ville distribution，which is tested on field seismic data． Because of shallow gas reser- voir has a characteristic that low frequency energy is stronger and high frequency energy is weaker，it indicates the presence of shallow gas successfully． |
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Keywords：
shallow gas;Wigner- Ville distribution;cross- term interference;kernel function;spectral decomposition
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Received Revised Online: |
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