A three-dimensional high-resolution reservoir model of the Eocene Shahejie Formation in Bohai Bay Basin,integrating stratigraphic forward modeling and geostatistics |
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| Institution: | 1. Research Institute of Unconventional Petroleum and Renewable Energy, China University of Petroleum, Qingdao 266580, China;2. Bohai Petroleum Research Institute, CNOOC Tianjin Branch, Tianjin 300452, China;3. Hancheng Branch of PetroChina Coalbed Methane Company Limited, Hancheng 715400, China;4. Essca Company, Beijing 100101, China;1. Geology Department, Faculty of Science, Mansoura University, Mansoura 35516, Egypt;2. Geology Department, Faculty of Science, Helwan University, Helwan, Egypt;3. BP, 14 Road 252, Maadi, Cairo, Egypt;1. Sorbonne Universités, UPMC Univ Paris 06, CNRS, Institut des Sciences de la Terre de Paris (ISTeP), 4 Place Jussieu, 75005 Paris, France;2. ENGIE, Paris, France;3. IFP Energies Nouvelles, Rueil-Malmaison, France;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;2. College of Energy, Chengdu University of Technology, Chengdu 610059, China;3. Postdoctoral Scientific Research Working Station, Shengli Oilfield Company, Sinopec, Dongying 257000, China;4. Zhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, China;5. Research Institute of Exploration and Development, Shengli Oilfield Company, Sinopec, Dongying 257015, China;1. Politecnico di Torino, Engineering Faculty, Department of Environment, Land and Infrastructure Engineering, Corso Duca degli Abruzzi 24, 10129, Torino, Italy;2. Delft University of Technology, Department of Geoscience and Engineering, Stevinweg 1, NL-2628CN, Delft, The Netherlands;1. Politecnico di Torino, Department of Environment, Land and Infrastructure Engineering, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;2. University of Leuven, Department of Earth and Environmental Sciences, Celestijnenlaan 200E, 3001 Leuven-Heverlee, Belgium;3. TNO, Netherlands Organisation for Applied Scientific Research, Princetonlaan 6, 3584CB Utrecht, The Netherlands |
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| Abstract: | Reservoir characterization based on geostatistics method requires well constraints (e.g. seismic data with high quality) to predict inter-well reservoir quality that is conformed to geological laws. Nevertheless, the resolution of seismic data in multiple basins or reservoirs is not high enough to recognize the distribution of different types of sand bodies. In this paper, we propose a new method to improve the precision of reservoir characterization: reservoir modeling with the constrains of sedimentary process model and sedimentary microfacies. We employed stratigraphic forward modeling, a process-based method, to constrain the reservoir modeling in one oil-bearing interval of the third member of Eocene Shahejie Formation in J-Oilfield of Liaoxi Sag, Bohai Bay Basin.We divide reservoir modeling into two orders using different types of constrains. In the first order, we use the simulated shale model from stratigraphic forward model that is corrected by wells data as a 3D trend volume to constrain the reservoir sand-shale modeling. In the second order, different types of sedimentary microfacies in the sandy part of the model are further recognized and simulated within the constrains of sedimentary microfacies maps. Consequently, the porosity, permeability and oil saturation are modeled under the control of precise sedimentary microfacies model. The high-resolution reservoir model shows that the porosity, permeability and oil saturation of distributary channel is generally above 20%, 10md and 50%, respectively, which are much higher than that of other types of sedimentary microfacies. It can be concluded that comparing to other types of sedimentary facies, distributary channel has better physical properties and more oil accumulation in the fan-delta front and therefore is the most favorable zones for petroleum development in the research area. |
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| Keywords: | Stratigraphic forward modeling Sedimentary microfacies Geostatistics Reservoir characterization Oilfield development Bohai Bay Basin |
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