Abstract: During fractured reservoir research,fracture identification is always difficult to be achieved in well log interpretation. After detailed analyzing and correlating the response characteristics of Dayi structure based on FMI and conventional logging,through the double scale method using the core scale imaging well logging data and imaging well logging scale conventional well logging,with the combination of various production and dynamic data,the general response characteristic of Dayi structure on Xujiahe Formation was studied,thus fractures identification model by means of conventional well log data was established.In the end,the plane distribution of the fractures in Dayi structure was revealed.