Reservoir characteristics and petroleum potential of the mid main carbonate, Upper Cibulakan Group, Northwest Java Basin, Indonesia

The Mid Main Carbonate sequence, which covers approximately 700 km^ in the Seribu Shelf area of the Northwest Java Basin, is a limestone petroleum reservoir rock of Middle Miocene age. It comprises numerous reef build-ups which, in general, trend north-south. In the northwestern part of the Seribu Shelf the carbonate build-ups may have formed fringing reefs since a northern source area supplied clastic detritus, especially during a probable low stand of sea level in the middle and at the end of carbonate deposition (probably at 12.5 ma and 10.5 Ma, respectively).