Abstract：Fracture characterization based on azimuthal anisotropy of P-wave amplitudes has been widely used to predict fracture density and azimuth.However,the fracture characterization method based on the amplitude anisotropy often encounters some problems in practical applications.The most serious one is that the prediction results of fracture density are largely influenced by cave and are insensitive to multi-orientation fractures.As a result,this fracture characterization method based on the amplitude anisotropy cannot obtain satisfactory results when dealing with complex fracturedvuggy carbonate reservoirs.To solve this problem,the paper proposed a new method for fracture characterization based on the anisotropy of anttracking attribute volumes to improve the performance on fracture characterization.Firstly,we get the distribution zones of fracture by multi anttracking results and fracture distribution regularity.Then,we can get the fracture density and azimuth based on anisotropy of P-wave amplitudes in the fracture-developed zones.The proposed method solves the problem of influence of cave and insensitivity to multi group fractures.In addition, the proposed method resolves the problem of only producing incomplete fracture distribution maps of the conventional ant-tracking algorithm.Application results to real datasets indicate that the proposed method can accurately characterize complex fracture-vuggy systems and give a quantitative description of fracture density.
王军, 李艳东, 甘利灯. 基于蚂蚁体各向异性的裂缝表征方法[J]. 石油地球物理勘探, 2013, 48(5): 763-769.
Wang Jun, Li Yandong, Gan Lideng. Fracture characterization based on azimuthal anisotropy of ant-tracking attribute volumes. OGP, 2013, 48(5): 763-769.
