Sedimentology and sequence stratigraphy of the Paleogene lower second member of the Shahejie Formation,W79 Block,Wenliu Oilfield,Bohai Bay Basin,China |
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| Institution: | 1. College of Resources Science and Technology, Beijing Normal University, Beijing, 100875, China;2. College of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao, 266500, Shandong, China;1. I.S. Gramberg All-Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean (VNIIOkeangeologia), Angliiskii pr. 1, St. Petersburg, 190121, Russia;2. Tallinn Teckhnological University, 5, ul. Ehitayaatee, Tallinn, 19086, Estonia;3. M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow, 119991, Russia;4. Earth Cryosphere Institute, Siberian Branch of the Russian Academy of Sciences, ul. Malygina 86, P/O box 1230, Tyumen, 625000, Russia;5. Central Laboratory for Mining and Geology, ul. Markova 35, Syktyvkar, 167004, Russia;6. St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia;1. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China;2. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China |
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| Abstract: | High-resolution stratigraphic analysis of the lower second member of the Shahejie Formation of the W79 Block of Bohai Bay Basin, China, has revealed that the study area, previously interpreted as a shallow water delta system, actually mainly originated in a subaerial setting with a distributive pattern. Depositional systems of the distributive fluvial complex (DFC) have been recognized. The regional correlation of the lithofacies within the different depositional systems has led to a high-resolution-stratigraphic framework of two long-term base level cycles, six middle-term base level cycles, and more than 58 short-term base level cycles. Sequence boundary SB1 marks the top of the target interval and is characterized by thick and continuous mudstone overlying sand-rich channel sediments. Sequence boundary SB2 marks the bottom of the target interval and is characterized by stably distributed shales between sand-rich sediments. The base-level fluctuation has a strong tectonic component consistent with the regional tectonic setting; during the active subsidence stage, base-level rising semicycles were recorded in the strata, and during the relatively stable stage, base-level falling semicycles were recorded. |
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