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When the delta S oilfield of Bohai Sea enters the “double high stage” of high recovery degree and high water cut, the uneven water flooding leads to more complex distribution of remaining oil. Therefore, it is necessary to refine the research scale from composite sand body to a single sand body, establish a fine reservoir model that quantitatively characterizes the configuration interface, and realize the fine description of the remaining oil distribution, which is the key to the next potential tapping in the oilfield. In this paper, firstly, the 'GR return rate' is used to identify the interlayer, and the quantitative identification method of configuration interface based on core analysis is formed. The high-precision isochronous stratigraphic framework of single sand body is established to realize the fine description of the remaining oil distribution in plane and vertical direction. Using fine numerical simulation, the remaining oil potential tapping strategy is proposed for different remaining oil enrichment modes at different water-bearing stages, and field verification is carried out. The result shows that the three-dimensional geological model considering the four-level configuration unit (single sand body level) has higher characterization accuracy. On the basis of configuration research, the potential tapping strategies of horizontal wells in different water-flooded modes are formed, including the top, bottom and middle remaining oil tapping mode of horizontal wells. The potential tapping strategy is applied to the field, and the remaining oil enrichment area of the single sand body with weak flooding is successfully found under the strong flooding area. The geological model established by fine division of configuration interface and quantitative characterization technology can accurately describe the oil–water distribution characteristics of oilfield after entering high water cut stage. It has successfully guided the secondary adjustment and development of S oilfield, and has good application value for offshore oilfields.

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Residual Oil Numerical Simulation Characterization Technology Based on Fine Reservoir Research in S Oilfield of Bohai Sea

  • 会议论文

  • 发表日期：

    2025年

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  • Gong-chang Wang,
  • Hui Cai,
  • Song-he Geng,
  • Jing-fu Deng,
  • Rui Zhang

摘要

When the delta S oilfield of Bohai Sea enters the “double high stage” of high recovery degree and high water cut, the uneven water flooding leads to more complex distribution of remaining oil. Therefore, it is necessary to refine the research scale from composite sand body to a single sand body, establish a fine reservoir model that quantitatively characterizes the configuration interface, and realize the fine description of the remaining oil distribution, which is the key to the next potential tapping in the oilfield. In this paper, firstly, the 'GR return rate' is used to identify the interlayer, and the quantitative identification method of configuration interface based on core analysis is formed. The high-precision isochronous stratigraphic framework of single sand body is established to realize the fine description of the remaining oil distribution in plane and vertical direction. Using fine numerical simulation, the remaining oil potential tapping strategy is proposed for different remaining oil enrichment modes at different water-bearing stages, and field verification is carried out. The result shows that the three-dimensional geological model considering the four-level configuration unit (single sand body level) has higher characterization accuracy. On the basis of configuration research, the potential tapping strategies of horizontal wells in different water-flooded modes are formed, including the top, bottom and middle remaining oil tapping mode of horizontal wells. The potential tapping strategy is applied to the field, and the remaining oil enrichment area of the single sand body with weak flooding is successfully found under the strong flooding area. The geological model established by fine division of configuration interface and quantitative characterization technology can accurately describe the oil–water distribution characteristics of oilfield after entering high water cut stage. It has successfully guided the secondary adjustment and development of S oilfield, and has good application value for offshore oilfields.