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Architecture Analysis of Migrated Stratigraphic Patterns in Pearl River Mouth Basin, Northern South China Sea
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
“Two different types of migrated stratigraphic patterns are identified under multiple subsidence centers and tectonic activities in the Eocene Wenchang formation of the Pearl River Mouth Basin, northern South China Sea. The 3D seismic data and well data are used to document the stratal stacking pattern, internal architecture and tectonic controls on the migrated stratigraphic units.
Type I is the stratigraphic units prograded in a back-stepping pattern inside the sag under the control of only one syn-rift bounding fault in a half-graben sag. Sequences inside the sag are characterized by the asymmetric continuous lateral migration from the base to the top on the seismic sections. The isopach map of sequences shows the depocenter gradually migrated up toward the bounding fault under the differential subsidence rate of the same fault in different periods. But the type-II showed stratigraphic units migrated across two or more sags under the control of different episodic tectonic activities from two bounding faults in a graben setting. Subject to the impact of the seesaw-mode movement of episodic rifting inside sag, seismic reflections of internal sequences show different in two tectonic episodes. The depositional centers also varied spatially and temporally with two tectonic episodes of bounding faults.”