Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (6): 1876-1888.doi: 10.13278/j.cnki.jjuese.20170313

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Stoneley Wave Response Characteristics of Gas-Bearing Fractural Volcanic Formation in Liaohe Eastern Depression

Wang Zhuwen, Xu Fanghui, Liu Jinghua, Ning Qinqin, Yu Yang   

  1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2018-02-26 Published:2018-11-26
  • Supported by:
    Supported by National Key Basic Research Program of China("973" Plan)(2012CB822002) and National Natural Science Foundation of China (41874135)

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Abstract: Nowadays, fractured reservoirs have attracted more and more attention, and how to effectively identify and evaluate a fractured formation has also been widely discussed. Wave-field separation and HHT were applied to the array acoustic logging data of the gas bearing fractured porous formation in Liaohe basin. The following conclusions are obtained:the presence of fractures and oil/gas causes attenuation of Stoneley wave energy (occurred mainly in high frequency section), basic frequency decrease and time lag, and they are correlated. The Stoneley wave energy and the reflection coefficient become larger along with the increase of the fractures. The ratio of high frequency and low frequency of Stoneley wave is called energy ratio. When the energy ratio is close to zero, it corresponds to the permeable fractured formation; while the energy ratio is relatively small, it may correspond to the permeable porous formation. The IMF retains the inherent physical properties of the raw array acoustic data, and the HHT spectrum contains abundant information, which can highlight the dynamic characteristics of array acoustic waves from time and frequency. Fourier transform and HHT can be used to evaluate the reservoir properties. HHT can magnify the sensitivity of array acoustic signals to formation properties and is easy to analyze and compare.

Key words: gas bearing fractured porous formation, Stoneley wave, wave-field separation, HHT, Liaohe basin, volcanic formation

CLC Number: 

  • P631.8
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