Received date: 2007-06-07
Revised date: 2007-10-09
Online published: 2008-06-20
It is important to predict a favorable fractured reservoir and its main azimuth of fractures during the exploration and exploitation of petroleum. When fractures occur in the reservoir, a nature interface can be formed by the huge difference of physical properties between fluids and compacted rocks, and it changes the characteristics of seismic reflection waves of the reservoir. These are the important information of the fractures existence in the seismic sections. AVO can detect fractures in formation, especially those distributed in certain orientation under structural stress. Theoretically, the influence of fractures to seismic attributes may reach maximum in its dip direction, and may reach minimum in its strike direction. And the influence is the same to AVO parameters. Therefore, applying the multi\|azimuthal AVO method to fractured reservoirs and its vector difference analysis can determine the fracture intensity and density of the reservoirs. The authors discuss in detail various azimuthal AVO responses of fractured carbonate reservoirs to various incidence angles, azimuth and fracture dips through theoretical formula, and find the relation between the AVO characteristics of seismic wave and the fracture strike and dip, especially for the tilt fractures, which provides the foundation for the prediction of favorable fractured reservoirs. The theory is successfully applied to the analyzation of the favorable fractured zone of Tarim.
Key words： Fracture; Anisotropy; Multi-azimuthal AVO; Azimuth.
MO Wu-ling,WU Chao-dong, . MULTI-AZIMUTHAL AVO ANALYSIS OF FRACTURED RESERVOIRS[J]. Natural Gas Geoscience, 2007 , 18(6) : 813 -818 . DOI: 10.11764/j.issn.1672-1926.2007.06.813
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