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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Platform Evolution and
Sequence
Stratigraphy of the Natuna Platform,
South China Sea
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By
By integrating seismic, well
-
log
, and core data into a
sequence
framework, seven complete depositional
sequences are recognized in the Miocene age Terumbu
Formation carbonates of the Natuna Platform, South China
Sea. Each
sequence
consists of a lowstand systems tract, a
transgressive systems tract and condensed section, and a
highstand systems tract.
Terumbu carbonates display a downward shift of
reservoir facies in the lowstand systems tract, deepen
upward (retrograde) in the transgressive systems tract, and
shoal upward (prograde) in the highstand systems tract. At
each sequence
boundary, there is erosional truncation of
the platform margin and upper slope and exposure of the
platform crest.
The highest porosity occurs in grain-prone shoal water
carbonates of the late highstand systems tract on the
platform crest. Porosity also occurs downdip from the
platform crest in the onlapping lowstand systems tract.
Sequence
stratigraphy, seismic facies, and seismic modeling
analysis
are used to map and predict reservoir distribution
on the Natuna Platform.
Increased subsidence from the Middle Miocene onward caused the retreat of the Natuna Platform. Retreat occurred in an asymmetric fashion with more retreat on the west, or low-productivity, shelfward side of the platform. Platform retreat occurred incrementally, during deposition of transgressive systems tracts and the condensed sections. The large eustatic sea level rise in the early Pliocene, combined with continued rapid subsidence, drowned the platform and ended carbonate production.
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