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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
2013. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/03041312026
Sequence-stratigraphic architectures and sand-body distribution in Cenozoic rifted lacustrine basins, east China
Shu Jiang,1 Sverre Henriksen,2 Hua Wang,3 Yongchao Lu,4 Jianye Ren,5 Dongsheng Cai,6 Youliang Feng,7 Paul Weimer8
1Energy and Geoscience Institute (EGI), University of Utah, Salt Lake City, Utah 84108; [email protected]
2Statoil Research Centre, Arkitekt Ebbels Vei 10, 7005 Trondheim, Norway; [email protected]
3Faculty of Earth Resources, China University of Geosciences, Wuhan, 430074 People's Republic of China; [email protected]
4Faculty of Earth Resources, China University of Geosciences, Wuhan, 430074 People's Republic of China; [email protected]
5Faculty of Earth Resources, China University of Geosciences, Wuhan, 430074 People's Republic of China; [email protected]
6China National Offshore Oil Corporation (CNOOC), Beijing, 100010 People's Republic of China; [email protected]
7Research Institute of Petroleum Exploration and Development, PetroChina, Beijing, 100083 People's Republic of China; [email protected]
8Department of Geological Sciences, University of Colorado, Boulder, Colorado, 80309; [email protected]
ABSTRACT
Cenozoic rifted lacustrine basins in east China display three main basin types: (1) basins with steeply dipping boundary fault
, whose hanging walls tilt along pivot points; (2) basins with listric boundary faults, whose hanging walls bend along flexural bending points; and (3) basins formed by earlier extensional rifting with later strike-slip movement superimposed.
The sequence development is intimately linked to the tectonic movements in the area, where second-order sequences are regionally correlatable from basin to basin and relate to the large-scale tectonic movements in the region. Third-order sequences are related to local tectonic activity and are correlatable within basins, between subbasins, and sometimes, between neighboring basins. Detailed sequence-stratigraphic analysis and mapping of depositional systems demonstrate that sand-body distribution patterns are related to sequence-stratigraphic frameworks. For the three kinds of basins, the positions of pivot point zones, flexural bend zones, and strike-slip faults plus the syndepositional faults all control the distribution of depositional systems, systems tract, and sand bodies. These controlling factors can be attributed to different structural and stratigraphic features that change the accommodation. Structural elements include boundary faults, syndepositional faults, and abrupt changes in dip. Stratigraphic controls include preexisting surfaces with local channelization, paleobathymetric lows, and onlap onto clinoform slopes. The lowstand sand bodies deposited at the downdip end of these controlling factors constitute the current and future exploration targets for conventional reservoirs.
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