Abstract: Aiming at difficulties to quantitatively predict fracture permeability tensor,present fracture occurrence was predicted based on occurrence change of rock mechanical layers.Present liner density of fracture was predicted based on the facture surface energy theory and the rock strain energy theory of fracture mechanics.According to the results of present stress field numerical simulation,fracture opening was calculated in three direction extrusion stress state and then present facture parallel permeability was determined.By using present fracture attitudes,static and dynamic coordinate systems were unified into geodetic coordinate system,a quantitative prediction model of multi-group fracture permeability tensors was constructed,formula for calculating the principal value of permeability and main value direction were given,and permeability at different directions in unit body was predicted by adjusting the dynamic coordinate system rotation angle.Three parameters,the ratio of the maximum and minimum value of the permeability,heterogeneity coefficient of permeability and variation coefficient of permeability,were defined to quantitatively evaluate fracture permeability heterogeneity.Fu-2 Member fractured reservoir in the eastern flank of Tongcheng fault belt was taken as an example to predict fracture permeability tensor.

Key words: permeability tensor, permeability anisotropy, quantitative prediction, fracture, Tongcheng fault belt