Sea-level changes,shoreline journeys,and the seismic stratigraphy of Central Luconia,Miocene-present,offshore Sarawak,NW Borneo |
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Institution: | 1. Institute of Oceanography, National Taiwan University, Taipei,Taiwan;2. Department of Earth Science, National Taiwan Normal University, Taipei, Taiwan;3. Precision Instrumentation Center, National Taiwan University, Taipei, Taiwan;4. Offshore Exploration & Production Division, Exploration & Production Business Division, Chinese Petroleum Company, Taipei, Taiwan;5. GeoResource Research Center, National Cheng Kung University, Tainan, Taiwan;6. Bureau of Mines, Ministry of Economic Affair, Taipei, Taiwan |
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Abstract: | 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. |
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Keywords: | Central Luconia Carbonate Deltaic Seismic stratigraphy Sealevel changes Forced regression |
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