B27 REDUCING UNCERTAINTIES AT AN EARLY STAGE – THE KEY TO MINIMIZE DEVELOPMENT RISKS IN THE AL-JURF FIELD 1 Summary 1 The Al Jurf oil field located in the Sabratah basin offshore Libya was put on stream in 2003 after having drilled only three exploration and appraisal wells since discovery date thirty years earlier. In order to fine tune the second phase of the development but also to identify potential upsides it was necessary to tackle at an early stage the substantial subsurface uncertainties of the stacked carbonate reservoirs El Gueria and Chouabine. An appropriate drilling sequence combined with a


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