Abstract:

The East  Java Basin  is one of  the most  important oil and gas bearing basins  in  Indonesia.  Its Cenozoic  tectonic
evolution can be summarized as  two  rifting phases and  two compressional events. The Eocene back-arc  rifting basin  resulted
from  the northward subduction of  the  Indo-Australian plate under Sundaland. The subduction changed  its direction  to NE-SW
in the Oligocene, which induced the second phase of E-W extension and rifting. The Roo Rise ocean plateau, south of East Java,
collided with Sundaland at about 15 Ma, which resulted in the formation of major type of oil traps and positive inversion structures
in the basin. Part of the Australian proximal continental slope collided with the Banda Volcanic Arc at about 3.5-2 Ma and caused
the second phase of compressional deformation in the East Java Basin.

Key words:  East Java Basin, Madura Island, back-arc rifting basin, tectonic evolution