Detection of permeable fractures by Stoneley waves in a hydrocarbon well in south of Iran

In naturally fractured reservoirs, hydrocarbon production is mainly depends on permeable fractures. Therefore detecting permeable fractures in reservoir rock is a priority. Generally, there are many methods to detect fractures in reservoirs includes using imaging log, temperature log, mud loss log. Imaging logs are unable to predict if a fracture is permeable or not, therefore It is necessary to use some complementary methods like acoustic methods to detect permeable fractures. In this paper, we analyzed a DSI (Dipole Shear Imager) tool which was taken from one of the hydrocarbon reservoirs in south of Iran. First, by using a commercial software (Geolog), the stoneley wave was separated into direct and reflected parts. Then the reflection coefficient of the stoneley wave calculated in the studied section. It is possible to determine if a fracture from FMI log is permeable or not By comparing it to its reflection coefficient. the Results of this method is promising.