Applying seismic geomorphology to delineate switched sequence stratigraphic architecture in lacustrine rift basins: An example from the Pearl River Mouth Basin,northern South China Sea |
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| Institution: | 1. Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, China;2. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;3. Shenzhen Branch of China National Offshore Oil Corporation Ltd., Shenzhen 510240, China;1. State Key Laboratory for Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China;2. Basin and Reservoir Research Center, China University of Petroleum (Beijing), Beijing 102249, China;3. Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX 78712, USA;4. Shenzhen Branch of CNOOC China Ltd., Guangzhou 510240, China;5. Department of Earth and Environmental Sciences, The University of Texas at Arlington, Arlington, TX 76019, USA;1. Faculty of Geoscience, State Key Laboratory of Petroleum Resources and Processing, China University of Petroleum, Beijing 102249, China;2. College of Geosciences, China University of Petroleum, Beijing 102249, China;3. Geological Science Research Institute, Sinopec Shengli Oilfield Company, Dongying 257015, China;4. China National Offshore Oil Corporation Research Institute, Beijing 100027, China;1. Research Institute for Exploration& Development, Daqing Oilfield Co Ltd, Daqing 163712, China;2. College of Earth Science, Northeast Petroleum University, Daqing 163318, China;1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;2. CNOOC Limited – Shenzhen Branch, Shenzhen 518000, China;3. Ocean College, Zhejiang University, Zhoushan 316021, China;4. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;1. College of Energy Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, PR China;2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059, PR China;3. C&C Reservoirs, 13831 Northwest Freeway, Houston, TX 77040, USA;4. Ocean College, Zhejiang University, Hangzhou, 310058, PR China;5. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing, 102249, PR China;1. BGR, Stilleweg 2, 30655 Hannover, Germany;2. ENS, Laboratoire de Géologie, 24 rue Lhomond, 75005 Paris, France |
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| Abstract: | Switched sequence stratigraphic architectural units were developed in the Eocene Wenchang Formation stratigraphic section of the Pearl River Mouth Basin (PRMB), northern South China Sea. Utilizing a high-quality 3D seismic data set, well logs and restored paleogeomorphology, the architecture and genesis of switched sequence stratigraphic units have been systematically investigated. The Wenchang Formation, a second-order sequence, can be subdivided into seven third-order sequences (from base to top: SQ1, SQ2, SQ3, SQ4, SQ5, SQ6, and SQ7). The sequence stratigraphic architecture of the Wenchang Formation is characterized by continuous lateral stacking patterns from sequences SQ1 to SQ7. Sequences SQ1–SQ4 mainly developed in the HZ26 sag, whereas sequences SQ5–SQ7 mainly developed in the XJ24 sag. The depositional centres of the Wenchang Formation appear to have migrated from the HZ26 sag to the XJ24 sag-along the northwest direction from sequences SQ1 to SQ7. Multiple tectonic activation episodes or alternating tectonic subsidence of the HZ26 and XJ24 sags resulted in the distinctive geomorphological features that effected the development of the switched sequence stratigraphic architecture in the study area. The switched sequence stratigraphic architecture presented in this study may provide new insights into a better understanding of sequence stratigraphic stacking patterns in continental lacustrine rift basins. |
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| Keywords: | Switched sequence stratigraphic architecture Seismic geomorphology Tectono-paleogeomorphology Alternating tectonic subsidence Pearl River Mouth Basin South China Sea |
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