Abstract:Directional fractures in formations are the passages through which hydrocarbon accumulates and migrates in low permeable reservoir,and they are very significant to hydrocarbon recovery.Authors describe how P-wave interval moveout varies with azimuth,and offer the relation between the interval moveout and anisotropic parameter in fractured formation. Interval moveouts of CDP trace gathers of 4 seismic P-wave lines which intersect in 450 one by one are picked to estimate anisotropic parameters,which are used to ascertain fractures in an interested formation. Modeling research shows that the method may be used to know the anisotropic parameters of fractured formatron.Authors also discuss the possibility of applying this method to real 2-D and 3-D P-wave data.