Fault Pressure-bearing Capacity Assessment for Gas Storage Conversion in Nanpu 1-5 Reservoir

doi:10.11885/j.issn.1674-5086.2025.12.15.03

Abstract

Abstract: The primary risk associated with repurposing complex fault-block oil reservoirs into gas storage facilities lies in the potential loss of fault seal integrity under alternating high and low pressure conditions during cyclic injection and production. Therefore, a quantitative assessment of the pressure-bearing capacity of faults is critical to ensuring the safe operation of such gas storage sites. This study, based on seismic data, drilling records, and production dynamics from the Nanpu 1-5 Reservoir, conducts a graded and staged evaluation of faults. Through four-dimensional geomechanical simulations covering the entire lifecycle of reservoir development and gas storage injection-production operations, the safe pressure-bearing capacity of faults is quantitatively evaluated. The results indicate that faults F1 to F6 generally exhibit large throws, characterized by sealing interfaces between gas-bearing layers and tight formations, demonstrating excellent sealing performance. The Nanpu 1-5 Reservoir is divided into four fault blocks: NP1-7, NP105X1, NP1-5X1090, and NP105X5. Critical weak points in these fault blocks are identified as boundary faults F2(NP1-7), F2(NP105X1), F5, and F6, with safe pressure-bearing capacities of 27.4, 28.9, 28.9, and 27.5 MPa, respectively. These findings provide a scientific basis for optimizing the maximum operating pressure of the NP1-5 gas storage facility. The methodology can be extended to enhance the operational efficiency of existing gas storage facilities through pressure optimization.

Key words: Nanpu Sag, reservoir, underground gas storage, fault, pressure-bearing capacity

CLC Number:

P624
TE972

WU Haitao, MA Xiaoli, LIU Mancang, XU Shujuan, LI Yehui, QIU Xiaosong. Fault Pressure-bearing Capacity Assessment for Gas Storage Conversion in Nanpu 1-5 Reservoir[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(4): 35-44.

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