Material Balance Equation for Fractured Vuggy Reservoirs with Aquifer Multiples: Case Study of Fuman Oilfield

Xingliang Deng, Zhiliang Liu, Peng Wang, Zhouhua Wang (), Peng Wang, Hanmin Tu, Jun Li and Yao Ding
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Xingliang Deng: PetroChina Tarim Oilfield Company, Korla 841000, China
Zhiliang Liu: PetroChina Tarim Oilfield Company, Korla 841000, China
Peng Wang: PetroChina Tarim Oilfield Company, Korla 841000, China
Zhouhua Wang: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
Peng Wang: PetroChina Tarim Oilfield Company, Korla 841000, China
Hanmin Tu: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
Jun Li: PetroChina Tarim Oilfield Company, Korla 841000, China
Yao Ding: PetroChina Tarim Oilfield Company, Korla 841000, China

Energies, 2025, vol. 18, issue 13, 1-24

Abstract: Accurate dynamic reserve estimation is essential for effective reservoir development, particularly in fractured vuggy carbonate reservoirs characterized by complex pore structures, multiple spatial scales, and pronounced heterogeneity. Traditional reserve evaluation methods often struggle to account for the coupled behavior of pores, fractures, and vugs, leading to limited reliability. In this study, a modified material balance equation is proposed that explicitly considers the contributions of matrix pores, fractures, and vugs, as well as the influence of varying aquifer multiples. To validate the model, physical experiments were conducted using cores with different fracture–vug configurations under five distinct aquifer multiples. A field case analysis was also performed using production data from representative wells in the Fuman Oilfield. The results demonstrate that the proposed model achieves a fitting accuracy exceeding 94%, effectively capturing the dynamics of fractured vuggy systems with active water drive. The model enables quantitative evaluation of single-well reserves and aquifer multiples, providing a reliable basis for estimating effective recoverable reserves. Furthermore, by comparing simulated formation pressures (excluding aquifer effects) with actual static pressures, the contribution of external aquifer support to reservoir energy can be quantitatively assessed. This approach offers a practical and robust framework for reserve estimation, pressure diagnosis, and development strategy optimization in strongly water-driven fractured vuggy reservoirs.

Keywords: fractured vuggy reservoir; water flooding; material balance equation; reserve (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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