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ABSTRACT: Structural and Stratigraphic Evolution of the East Java Sea, Indonesia

BRANSDEN, P. J. E., BP Exploration, Jakarta, Indonesia, and S. J. MATTHEWS, BP Exploration Structural Studies Group, London, United Kingdom

The East Java Sea displays excellent examples of Miocene to present-day structural inversion of a Paleogene basin system. The structural geometry of these inversions has been analyzed by construction of a series of regional cross sections which demonstrate significant lateral variation in structural style. This variation is interpreted to be a function of the fault shape and linkage that evolved during basin development, and also is locally controlled by propagation of new detachments. Prediction of fault geometry has been aided by comparison with analog models of inverted extensional basins.

Driving mechanism of structural inversion have been assessed by modeling the motion of the Eurasian, Indian Ocean, Australian, and Pacific plates during the Neogene. The evolution of inversion within the East Jave Sea is interpreted to have been controlled by the variation in relative convergence rate and direction of the subducting Indian Ocean plate and the southeastern Eurasian plate during the Neogene. The collision of the Australian plate with the eastern continuation of the Sunda Arc has produced complex thrust structures which are interpreted to be propagating westward along the Sunda Arc at the present day.

Stratigraphic evolution has been controlled by the interaction of Paleogene extensional basin development, Neogene inversion and relative sea level fluctuations. The sediment fill shows alternation of carbonate-dominated and clastic-dominated cycles.

The use of wireline logs incorporated with seismic and biostratigraphic data allows a detailed sequence stratigraphy to be developed, with both regionally and locally recognizable highstand, lowstand and transgressive systems. A well-imaged propagational carbonate platform margin exhibits late-stage growth and subsequent inundation used to calibrate locally derived sea level curves.

 

AAPG Search and Discovery Article #91015©1992 AAPG International Conference, Sydney, N.S.W., Australia, August 2-5, 1992 (2009)