Permeability is one of the major controls for production inrnfractured basement. It is critical to be able to identify andrncharacterize permeable zones in the basement reservoirs notrnonly for evaluating well producing potential but also forrndesigning perforation, well completion and injection. Evenrnthough geoscientists and reservoir engineers have madernconsiderable effort over the years to better characterize thernpermeability profile in fractured basement, it is still veryrnchallenging to achieve this objective.rnThis paper presents a newly developed approach aimed atrnbetter understanding the permeability profile. The techniquernwas developed based on case studies from wells in tworndifferent basement fields located offshore in the south ofrnVietnam. Traditionally, fractures have been characterizedrnusing core and borehole image data. In this study, boreholernimage data were integrated with other open-hole logs to deriverna permeability curve. The result was calibrated with core datarnand then validated with dynamic data i.e. production log data,rnwell testing data, mud losses, gas shows. As demonstrated inrnthe case studies, it is believed that the permeability in thernbasement could be reasonably evaluated using this method.rnHowever, in a zone where fractures are cemented or partiallyrncemented with conductive minerals, the log-derivedrnpermeability needs to be calibrated with the degree ofrncementation.
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