Tectonics And Stratigraphy Of East Java Sea North Of Madura Island, Indonesia

The purpose of this paper is to provide a modern<br>regional geological and geophysical interpretation of<br>the East Java Sea Basin. The basis for this seismic<br>interpretation are 798 kilometers of recently acquired<br>non-exclusive 2D seismic data and ties to well data.<br>The East Java Sea displays excellent examples<br>of Miocene to present-day structural inversion of a<br>back-arc Paleogene basin system. The structural<br>geometry of these inversions has been analysed by a<br>series of non-exclusive seismic surveys that<br>demonstrate significant lateral variation in structural style.<br>Driving mechanisms of structural inversion have<br>been assessed by modelling motions of the Eurasian,<br>Indian Ocean, Australian and Pacific plates during the<br>Neogene. The evolution of such inversion within the<br>East Java Sea is interpreted as a function of the<br>collision of the Australian Plate with the Sunda Arc.<br>Moreover, the relative convergence rate and direction<br>of the subducting Indian Ocean Plate and the S.E.<br>Eurasian Plate affect inversion.<br>Two tectonic phases have been identified, one<br>controlling the Paleogene rift and the other<br>controlling the Neogene faulting<br>Structures formed during the Late Miocene were<br>identified in seismic data. They represent prospective<br>exploration features. On the shelf areas, patch reefs<br>and shallow marine sandstone ranging from Oligocene<br>to Middle Miocene are the targets for exploration.<br>Reef limestones from the Pliocene age where<br>sealed by Recent mudstones are also of interest.