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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
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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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