Fig. 1 (a) Tectonic configuration for the East Sea formation
and the Ulleung Basin. Sedimentary basins are marked as
dotted line. (b) Location of the modeled seismic profile
and the Dolgorae-I well
Fig. 2 (a) Modeled seismic profile and (b) its stratigraphic
interpretation showing 7 sequence boundaries on the southern
margin of the Ulleung Basin (S. Huh, 2000, personal communication)
Fig. 3. Simulation results showing the modeled sequences
with basin forming tectonics (a) Pre-simulation output
for the initial sequence boundary composed of volcanic
flows and sills intercalated with sediments on the northern
half of the acoustic basement. Simulation outputs, (b)
and (c) for the 1st and 2nd sequences deposited between
17 Ma and 12 Ma. The 1st and 2nd sequences consist of
bathyal sediments related to faster subsidence than eustatic
fall and high sediment supply rate. Simulation outputs,
(d) and (e) for the 3rd and 4th sequences accumulated
between 12.5 Ma and 6.3 Ma, The units are deposited in
coastal settings after uplift of the anticline folded
zone at the Dolgrae-I well. (f) and (g) are showing the
5th and 6th seqeuences deposited between 6.3 Ma and present.
The units show complicated aggradational and progradational
phases that are attributed to slower basement subsidence
and short-term sea-level fluctuations.
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Period: 2000 - 2001
Goal:
To reproduce evolution of the Ulleung Basin, East Sea
of Korea, using SEDPAK
Co-Researchers:
Daekyo Cheong(Kangwon National Univ.)
C.G.St.C Kendall(U. of South Carolina)
Publication:
Kim, W.S., Cheong, D.K. and C.G.St.C Kendall, Reproducing
clastic sedimentary sequences by computer simulation:
late Tertiary southern Ulleung Basin, East Sea (Sea of
Japan). (Submitted to Sedimentary Geology)
Download:
[PDF:5.29 MB/43 pages]
Abstract:
Clastic sedimentary sequences of a 100 km section
of the southern part of the late Tertiary Ulleung Basin,
East Sea were reproduced using the SEDPAK stratigraphic
modeling program. The input parameters that described
the sedimentary facies, paleobathymetry, and variations
in eustasy were derived from both seismic and well data,
and were used to forward model a basin interpretation.
The two-dimensional graphical simulation, began with
a rapid initial subsidence (- 0.527 m/ka; average rate
of 17 Ma to 12 Ma of 100 km section) related to early
Miocene back-arc spreading. This was followed by folding
and uplift (+ 0.051 m/ka; average rate of 12 Ma to 9
Ma of 100 km section) of the southern part of Ulleung
Basin as it responded to late Miocene back-arc closing.
The simulation provided quantitative verification of
previous basin studies, including numerical constraints
on basin forming tectonics, sedimentation, and burial
history. The subsidence rates for 100 km segments along
the section and 85 time steps of 200 ka duration enabled
the detailing of the sedimentary facies and stratal
geometries observed in seismic profiles, and suggested
numerical analysis of the sequence stratigraphy within
the Ulleung Basin over the last 17 Ma.
Key
words: sequence stratigraphic model, SEDPAK, Ulleung
Basin, seismic profile, burial history
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