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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: A Comparison of Two Late Pleistocene
Shelf-Edge Deltas (Indonesia and Gulf of Mexico)-
Stratigraphic Architecture,
Systems
Tracts
, Bounding
Surfaces, and Reservoir Potential
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By
1Coastal Studies Institute of Oceanography an Coastal Sciences
Louisiana State University, Baton Rouge, Louisiana, 70803
2Marathon Oil Company, Houston, Texas, 77056
3BP Amoco, Houston, Texas, 77210-4587
43730 Rue Nichole, New Orleans, Louisiana, 70131
Thousands of kilometers of high-resolution seismic data have
been collected over two late Pleistocene shelf-edge deltas in
very different settings, the northern Gulf of Mexico and the eastern
shelf of Borneo in Indonesia. Both deltas have been constructed
by filling-to-lowstand deposition associated with the
latest Pleistocene glacial maximum, the former sourced by the
temperate Mobile River, the latter by the equatorial Mahakam River. Four cores provide detailed stratigraphic control for the
Mobile River delta while one long boring and numerous piston
and vibracores provide stratigraphic control on the Mahakam Delta. Systems
tracts
and key bounding surfaces have been related
to the eustatic
sea
level
curve in both settings. Sequence architectures
differ significantly, an important consequence of different
depositional settings.
The tropical Mahakam shelf is tectonically active and has low
wave energy strong oceanic currents, upwelling, and a mixed siliciclastic
- carbonate depositional system. The resulting falling-to-lowstand clinoforms downlap a highly irregular
surface of isolated carbonate bioherms built above a transgressive
surface that formed during the preceding sea
level
rise.
The northeastern Gulf of Mexico shelf is relatively stable, also has low wave energy, but is dominated by siliciclastic sedimentation. Falling-to-lowstand progradation of the Mobile River delta (Lagniappe Delta) has occurred in numerous overlapping and spatially offset lobes incised by a complex channel network. Clinoforms downlap an isotope stage 5 interglacial condensed section. The Lagniappe Delta depocenter has migrated from southeast to west; southeastern lobes show evidence of variable wave influence while the western flank is fluvially dominated. Both the Mahakam and Lagniappe deltas are composed of sand-rich clinoforms and channel deposits that possess excellent potential reservoir properties.
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