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Book Chapter

Chronostratigraphy and Microfossil-Derived Sea-Level History of the Qiong Dong Nan and Ying Ge Hai Basins, South China Sea

By
Peter R. Thompson
Peter R. Thompson
Computational Biochronology, P.O. Box 261039, Plano, Texas 75026-1039, U.S.A.
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William H. Abbott
William H. Abbott
Nanno-Chron International, 747 North Oak Branch, Waxahachie, Texas 75167, U.S.A.
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Published:
January 01, 2003

Abstract

Analysis of biostratigraphic information from 31 industry wells in the Qiong Dong Nan and Ying Ge Hai Basins in the South China Sea establishes a chronostratigraphy for the area. Microfossil biostratigraphy of the wells permits recognition of individual regressive sequences and overlying marine flooding events. Dating of the sequences and unconformities shows a definite correlation of the transgressions and regressions to those depicted on published global sea-level curves. This tie indicates the influence of sea level on sediment dispersal enhancing local rift-related deposition.

Age control developed for the basins in this study has improved stratigraphic correlations by verifying seismic-to-well ties and providing bracketing ages across hiatuses. Wells in the basins penetrate a thick Holocene–Pliocene clastic interval to reach an Upper Miocene deep-water clastic reservoir in offshore downdip wells or a Lower Miocene–Upper Oligocene shallow-water clastic reservoir horizon on structural highs. Although the hydrocarbon source is assumed to be local Lower Tertiary (Eocene or older) nonmarine coals, these units have not yet been reached by drilling. The regional seal is an upper Middle Miocene marine flooding event.

Paleoecology and paleobathymetry were determined on the basis of foraminiferal analyses. Biostratigraphic dating with foraminifera and calcareous nannofossils permits construction of time-slice maps to show the basin configuration at correlative horizons. Synthesis of many individual well paleobathymetry curves yields a general sea-level curve for the basins. The overall shape of this sea-level curve compares favorably with published global curves.

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SEPM Special Publication

Micropaleontologic Proxies for Sea-Level Change and Stratigraphic Discontinuities

Hilary Clement Olson
Hilary Clement Olson
Institute for Geophysics, University of Texas, 4412 Spicewood Springs Rd., Bldg. 600, Austin, Texas 78759-8500, U.S.A.
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R. Mark Leckie
R. Mark Leckie
Department of Geosciences, University of Massachusetts, 611 N. Pleasant St., Amherst Massachusetts 01003, U.S.A.
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SEPM Society for Sedimentary Geology
Volume
75
ISBN electronic:
9781565762121
Publication date:
January 01, 2003

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