Naturally fractured reservoirs normally exhibit high horizontal permeability anisotropy. Orientation of anisotropy, degree of anisotropy, and maximum/minimum permeabilities are required to describe the reservoir flow anisotropy. These parameters are normally obtained from interference testing. A series of sensitivity study was conducted to investigate the reliability of these estimated parameters from an interference analysis. The results show that interference test analysis gives reliable estimate of the orientation of anisotropy. However, the degree of anisotropy, maximum/minimum permeabilities, and total compressibility are very sensitive if the degree of permeability anisotropy is high and if the well configuration is unfavorable. Among the above parameters, the degree of anisotropy is the least reliable.

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