Journal
MARINE AND PETROLEUM GEOLOGY
Volume 59, Issue -, Pages 35-55Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2014.07.005
Keywords
Central Luconia; Carbonate; Deltaic; Seismic stratigraphy; Sealevel changes; Forced regression
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Central Luconia is a geological province of the Sarawak Basin, offshore NW Borneo, characterised by extensive development of Miocene to Recent carbonate build-ups. In the subsurface, many of these build-ups are reservoirs for hydrocarbons. This study focuses on shelf-wide stratigraphic architecture, from which implications are drawn for the stratigraphic-sealing potential of the deltaic clastics. A stratigraphic model is proposed whereby clastic sediments surrounding the carbonate build-ups are interpreted as stacked low-relief deltas deposited in response to high-frequency oscillation of the sea level. The deltas are shown to have frequently prograded beyond carbonate build-ups. As a result of interaction between eustacy and deposition, deltaic topsets are juxtaposed against carbonate build-ups, providing migration routes for hydrocarbons. Most of the carbonate reservoirs are consequently underfilled, with hydrocarbon columns limited to the youngest onlapping stratigraphic sequence. (C) 2014 Elsevier Ltd. All rights reserved.
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