A seismic geomorphology study of the fluvial and lacustrine-delta facies of the Cretaceous Quantou-Nenjiang Formations in Songliao Basin,China |
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| Affiliation: | 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. CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China;2. Institute of Tectonics and Geophysics, Far Eastern Branch, Russian Academy of Sciences, Khabarovsk, Russia;1. JX Nippon Oil & Gas Exploration Corporation, Japan;2. JX Nippon Oil & Gas Exploration (Qatar) Ltd, Qatar;3. JX Nippon Oil Exploration (U.S.A.) Ltd, USA;4. JX Nippon Oil & Gas Consulting Services (Mekong) Ltd, Japan;5. JX Nippon Oil & Gas Exploration Technical Service Corporation, Japan;1. Oil and Gas Survey, China Geological Survey, Beijing 100083, China;2. National Key Laboratory of Continental Shale Oil, Daqing 163002, China;3. Key Laboratory of Unconventional Oil and Gas, China Geological Survey, Beijing 100029, China;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China;2. Unconventional Oil and Gas Science and Technology Institute, China University of Petroleum, Beijing, 102249, China;3. Research Institute of Petroleum Exploration and Development, Beijing, 100083, China;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;2. Ocean College, Zhejiang University, Hangzhou 310058, China;3. College of Geosciences, China University of Petroleum, Beijing 102249, China;4. China National Offshore Oil Corporation Limited – Shenzhen, Guangzhou 510000, China;5. School of Geosciences, Yangtze University, Wuhan 430100, China |
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| Abstract: | With the aid of seismic geomorphology method, depositional systems such as fluvial-delta and turbidity current of the Cretaceous Quantou-Nenjiang Formations in Sangliao Basin were studied in detail as well as the morphology, dimension, depositional structures and boundaries of these sedimentary bodies. A geological model of a point bar in a fluvial system and the method to identify paleocurrent direction were proposed. The delta of Yaojia Formation with a gentle slope less than 1.4‰ in trangressive system tract (TST) was controlled by lake waves. Subaqueous distributary channels were widely developed in large-scale delta front with a width more than 16 km. Fluvial-dominated deltas with leaf and bird's foot shapes were widespread in highstand system tract (HST) of Qinshankou and Nengjiang Formation with moderately high slope gradients of 4‰ and 6.7‰.The width of the leaf-like and bird's foot delta front ranges from 1 km to 4 km and 3 km–5 km respectively. The mouth bar were well preserved due to the poorly developed widely distributed subaqueous distributary channels and the delta plains having widths of 9 km–15 km, 16 km-25 km respectively. Many turbidity current systems were recognized in the TST of the first member of Nengjiang Formation and the distribution area is about 10,000 km2. Fourteen sublacustrine fans with different dimension were formed by ten fluvial-delta systems extending 30 km–70 km toward the lake from the west and south. With the application of seismic geomorphology, the analysis of fluvial system, delta system and turbidity current system could switch from approximation to quantitative analysis. Sedimentary model proposed for point bars and the quantitative analysis of delta system could provide new technical support for exploration and drilling plan. The research on turbidity current systems will also be beneficial for new exploration targets. |
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| Keywords: | Fluvial system Delta system Turbidity current system Songliao Basin Seismic geomorphology |
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