Lithologic Reservoirs ›› 2008, Vol. 20 ›› Issue (1): 101-104.doi: 10.3969/j.issn.1673-8926.2008.01.017

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Using time-frequency analysis to identify oil and water layers in array acoustic logging

ZHANG Xuetao1, WANG Zhuwen1, YUAN Jinghai2   

  1. 1. College of Geo-Exploration Science and Technology, Jilin University, Changchun 130026, China; 2. Department of Science and Technology, Liaohe Petroleum Exploration Bureau, PetroChina, Panjin 124010, China
  • Online:2008-03-15 Published:2008-03-15

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Abstract:

Time-frequency analysis method has been applied in many fields, and it acquires a great of achievements. Choi-Williams time-frequency method is proposed for array acoustic logging signal analysis to identify different reservoirs. Choi-Williams distribution has apparent physical significance. The Choi-Williams energy distribution has different characteristics under different time and different frequency, which is applied to identify oil and water layers. Good result has been achieved.

Key words: lithologic reservoirs, line-ups, isochronous surface, impedance inversion, calcareous compacted sandstone

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