Journal of Jilin University(Earth Science Edition) ›› 2021, Vol. 51 ›› Issue (1): 266-276.doi: 10.13278/j.cnki.jjuese.20190291

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AVOA Inversion Methodof Fractured Reservoir Based on Petrophysical Model

Chen Xiangzhong1, Wang Bin2   

  1. 1. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China;
    2. College of Geophysics, Chengdu University of Technology, Chengdu 610059, China
  • Received:2019-12-20 Online:2021-01-26 Published:2021-02-02
  • Supported by:
    Supported by the National Natural Science Foundation of China (41774136)

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Abstract: At present, the P-wave anisotropy-based fracture prediction method is widely-used with relatively satisfactory performance. However, the accuracy of the conventional ellipse fitting method is affected by a series of factors, which leads to inaccurate inversion results of fracture density. In this study, the calculation method of reservoir fracture density in anisotropic media is derived according to the exact formula of Ruger equation. Firstly, the reflection coefficient of P-wave is calculated by using the functions of incidence angle, azimuth angle, Thomsen anisotropy and medium elastic parameters; then the tangential anisotropy coefficient of fractures in the reservoir to be measured is calculated according to the reflection coefficient of P-wave; finally, according to the anisotropy coefficient, the fracture density of the reservoir to be measured is calculated. The fracture density of Zhengbanan area in the Sichuan basin was calculated by using the fracture inversion results obtained from the actual P-wave AVOA data, and the results are consistent with the drilling data. It shows that this method can be used to determine the fracture development status and the fractured reservoir identification.

Key words: physical model of fractured rock, anisotropy, fracture density, P-wave AVOA, Sichuan basin

CLC Number: 

  • P618.13
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