f Play mapping in the East Java Basin, Indonesia: A Methodology for Future Exploration in

The East Java basin of Indonesia is a long established petroleum province notable for having delivered significant volumes in the modern exploration era. The basin contains an unusually large variety of clastic and carbonate reservoir-seal pairs reflecting tectonostratigraphic settings ranging from extensional rift basins to stable platform areas to compressional and wrench-related inversion reflecting proximity to the convergent margin to the south. The large variety of plays and potential for further discoveries make the basin an ideal candidate for a systematic split-risk CRS mapping approach to determine remaining exploration potential both within proven and unproven play areas in both conventional and stratigraphic traps. CRS maps and stacks have been produced for nineteen plays over the greater East Java area as far north as the Assem Assem Basin and eastwards to the southwestern arm of Sulawesi. This methodology is repeatable and applicable to other western Indonesian Basins, as the focus shifts towards traps with significant stratigraphic trapping components and should help increase our understanding of the factors responsible for failure, hopefully leading to better predictive capabilities for success.