Abstract: In low-permeability reservoirs,as a kind of important reservoir space and hydrocarbon migration channel,fractures are of important research value.On the basis of summarizingpredecessors' fracture identification prediction research,using a variety of conventional logging methods to detect A well in southwest China's Sichuan,by crossplot method to determine fracture frame parameters,based on logging data to calculate fracture porosity and secondary porosity parameters.Finally,in combination with imaging logging data to carry out comprehensive prediction of fracture development degree.The results indicate at the depth of 3 423~3 438 m,the fracture development degree is good,which is in consistent with geological data and this provides a reference basis for oil and gas exploration and development in southwest Sichuan.