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<p>The conventional material balance method considers the impact of crude oil, rocks, and their bound water on the calculation of dynamic reserves, but does not consider the distribution characteristics of oil and water in fracture-vuggy reservoirs to consider the coexistence of internal oil and water bodies, or water bodies connected to the outside, as well as the impact of dissolved gas precipitation as the reservoir develops. Based on the distribution characteristics of oil and water in fracture-vuggy reservoirs, a dynamic reserve correction calculation model considering the influence of degassing is established. This correction calculation model is used to calculate the three example wells A, B, and C that produce a large amount of gas in the fracture-vuggy reservoirs. Compared with the conventional dynamic reserve calculation model, the results show that there is a significant difference before and after the calculation of the three wells, with an error of over 20%. The maximum error of well C is 45.42%. It indicates that a large amount of gas is dissolved in the three well reservoirs, and a large amount of dissolved gas is released during the reservoir development process, resulting in a decrease in the reservoir volume. The calculation results are more in line with the actual reservoir.</p>

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A New Method for Calculating Dynamic Reserves of Fractured-Vuggy Reservoirs Considering Dissolved Gas Precipitation

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • Chen Xiaofan,
  • Zou Yifan,
  • Mu Yu,
  • Li Kuanguo,
  • Zhang Junhao,
  • Wang Hongpeng,
  • Yue Ping,
  • Geng Jie

摘要

The conventional material balance method considers the impact of crude oil, rocks, and their bound water on the calculation of dynamic reserves, but does not consider the distribution characteristics of oil and water in fracture-vuggy reservoirs to consider the coexistence of internal oil and water bodies, or water bodies connected to the outside, as well as the impact of dissolved gas precipitation as the reservoir develops. Based on the distribution characteristics of oil and water in fracture-vuggy reservoirs, a dynamic reserve correction calculation model considering the influence of degassing is established. This correction calculation model is used to calculate the three example wells A, B, and C that produce a large amount of gas in the fracture-vuggy reservoirs. Compared with the conventional dynamic reserve calculation model, the results show that there is a significant difference before and after the calculation of the three wells, with an error of over 20%. The maximum error of well C is 45.42%. It indicates that a large amount of gas is dissolved in the three well reservoirs, and a large amount of dissolved gas is released during the reservoir development process, resulting in a decrease in the reservoir volume. The calculation results are more in line with the actual reservoir.