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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
DOI: 10.1306/02151916513
Seismic-based identification and stage analysis of overlapped compound sedimentary units in rifted lacustrine basins: An example from the Bozhong sag, Bohai Bay Basin, China
Sen Li,1 Hongtao Zhu,2 Changgui Xu,3 Hongliu Zeng,4 Qianghu Liu,5 and Xianghua Yang6
1Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, China; Department of Petroleum Geology, Faculty of Earth Resources, China University of Geosciences, Wuhan, China; [email protected]
2Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, China; Department of Petroleum Geology, Faculty of Earth Resources, China University of Geosciences, Wuhan, China; [email protected], [email protected]
3Technology Department, Tianjin Branch, China National Offshore Oil Corporation, Ltd., Tianjin, China; [email protected]
4Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, Austin, Texas; [email protected]
5Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, China; Department of Petroleum Geology, Faculty of Earth Resources, China University of Geosciences, Wuhan, China; [email protected]
6Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan, China; Department of Petroleum Geology, Faculty of Earth Resources, China University of Geosciences, Wuhan, China; [email protected]
ABSTRACT
Using recently acquired three-dimensional seismic data, we summarize typical patterns for seismic-based identification and stage analysis of sedimentary units in the Eocene succession of the southern slope-break belts of the Bozhong sag, Bohai Bay Basin, China. The sedimentary units in the study area are characterized by progradational reflectors and mound-shaped, bidirectional downlapping reflectors in dip and strike directions, respectively. Differential characteristics of a distinct sedimentary unit within one lobe are documented. The major provenance direction is defined and characterized by the largest dip angles of reflectors, the longest transport distance of sediments, and the thickest deposits in comparison to other dip directions—all recognized in this study and serving as typical characteristics for sedimentary unit identification and separation from the overlapped sedimentary complex. This study also summarizes diverse patterns—including collateral and prograding types—of sedimentary unit contact relationships and stage analysis along dip and strike directions. Collateral patterns are composed of three subtypes: superimposed, antithetic, and isolated. Three sedimentary units—S1, S2, and S3—are recognized in the study area. Summarized patterns of sedimentary unit contact relationships indicate that S1 was deposited earliest and S3 latest. The proposed patterns supplement seismic-based sedimentologic studies. This work may serve as a useful reference for sand-body characterization and stage analysis in other basins and similar areas.
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