Three-dimensional facies architecture analysis using sequence stratigraphy and seismic sedimentology: Example from the Paleogene Dongying Formation in the BZ3-1 block of the Bozhong Sag,Bohai Bay Basin,China |
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| Institution: | 1. Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences, Ministry of Education, Wuhan 430074, Hubei, China;2. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;3. Tianjin Branch of China National Offshore Oil Corporation Ltd., Tianjin 300452, China;4. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;5. CSIRO Earth Science and Resource Engineering, P.O. Box 1130, Bentley, W.A. 6102, Australia;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;2. Basin and Reservoir Research Center, China University of Petroleum, Beijing 102249, China;3. School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;1. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;2. Energy & Geoscience Institute, University of Utah, Salt Lake City 84108, Utah, USA;3. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;4. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China;5. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China;1. Key Laboratory of Tectonics and Petroleum Resources (China University of Geosciences), Ministry of Education, Wuhan 430074, China;2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing, 102249, China;3. Bureau of Economic Geology, The University of Texas at Austin, Texas, 78712, USA;4. School of Energy Resources, China University of Geosciences, Beijing, 10083, China;1. Research Institute of Exploration and Development, PetroChina Jidong Oilfield, Hebei, Tangshan, 063004, China;2. Sinopec Petroleum Exploration and Production Research Institute, Beijing, 100083, China;3. Hubei Cooperative Innovation Center of Unconventional Oil and Gas (Yangtze University), Wuhan, Hubei, 430100, China;4. Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University), Ministry of Education, Wuhan, Hubei, 430100, China |
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| Abstract: | The Bohai Bay Basin is a classic non-marine rift basin in eastern China. The Paleogene Dongying sequences are the main hydrocarbon-bearing stratigraphic unit in the basin. Using three-dimensional (3-D) seismic data and one well control in the BZ3-1 Block in the western slope of the Bozhong Sag, we analyzed 3-D facies architectures of the Dongying sequences. The Dongying Formation, a second-order sequence, can be subdivided into four third-order sequences (from base to top: SQ1, SQ2, SQ3, and SQ4). The facies architecture was analyzed by using the seismic sedimentology approach based on 3-D seismic data. Sediment of the Dongying sequences was derived from the northern Shijiutuo Uplift via four major configurations of incised valleys, namely “V”, “U”, “W”, and composite shaped incised valleys. Seismic stratal slices reveal branching and converging characteristics of the channels from upstream to downstream. On the basis of an integrated analysis of well log, core data, seismic facies based on multi-seismic attributes, three sedimentary facies (e.g., “delta”, “fan-delta”, and “shore” or “shallow lacustrine” facies) have been recognized. The four types of incised valleys and their evolution control the sedimentary systems in the sedimentation area. The numbers and sizes of the fans are controlled by the sedimentary systems at various scales. Incised valley-fill and deltaic sand bodies are excellent hydrocarbon reservoirs and potentially good exploration targets for the study area. The reservoir quality of sequences SQ1, SQ2, and SQ3 become better gradually from base to top. The proposed sediment dispersal patterns may aid in the prediction of potential reservoir distribution. This study also demonstrates that facies architecture analysis using sequence stratigraphy and seismic sedimentology may serve as an effective approach for constructing 3D facies models for petroleum exploration in areas lacking of well or outcrop data. |
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| Keywords: | Seismic sedimentology Incised valley Delta Dispersal pattern Dongying sequences |
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