Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (4): 131-137.doi: 10.3969/j.issn.1673-8926.2017.04.016

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Acoustic anisotropy of water-saturated and desiccated carbonate rocks

CHEN Chao, LOU Zhanghua, JIN Aimin   

  1. Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China
  • Received:2017-02-14 Revised:2017-04-01 Online:2017-07-21 Published:2017-07-21

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Abstract: In order to understand the propagation rules of acoustic wave of carbonate rocks in the condition of desiccated and water-saturated,the desiccated and water-saturated quadrate samples of carbonate rocks were taken the acoustic testing and numerical simulation testing,and the acoustic waveform,propagation velocity and spectral features of carbonate rocks were studied. The results show that when the acoustic waves through the samples,the waveform is loose,and the cycle is obviously increased. The period increases further after saturated with water,and the maximum amplitude position moves forward. There are obvious anisotropic characteristics of the wave velocity and dominant frequency of the rock samples. The more the fracture develops,the greater the anisotropy coefficient of wave velocity and dominant frequency is,and the P-wave velocity and dominant frequency decreases obviously along the vertical direction of fracture. The anisotropy coefficient of the wave velocity and the dominant frequency of the desiccated samples can be used to evaluate the anisotropic characteristics. The dominant frequency is more sensitive for the anisotropy. The anisotropy coefficient is greatly reduced after saturated with water. This study result is helpful for us to use acoustic logging correctly and to recognize the anisotropic characteristics of carbonate reservoir.

Key words: petroleum migration, petroleum downward migration, exploration targets, basement reservoirs, query

CLC Number: 

  • TE135
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