A Study on the Geological and Gas Reservoir Engineering Plan for PG2 Underground Gas Storage

doi:10.11885/j.issn.1674-5086.2026.02.09.01

Abstract

Abstract: The integrated construction of oil reservoir-type gas storage coupled with natural gas flooding for enhanced oil recovery has emerged as a significant direction in recent years. Through mechanisms such as gravity segregation, miscible displacement, and extraction, this approach can effectively improve crude oil recovery while establishing large-scale seasonal peak-shaving capacity. Taking the PG2 Underground Gas Storage of Jidong Oilfield as an example, this paper systematically conducts geological condition evaluation for gas storage construction, sealing analysis of cap rocks and faults, design of injection-production capacity, and optimization of storage capacity parameters, thereby demonstrating the feasibility of converting such oil reservoirs into gas storage facilities. The results indicate that the target block features thick reservoirs, favorable physical properties, excellent fluid characteristics, and regionally stable cap rocks with strong sealing capability. The comprehensive evaluation shows that the dynamic sealing pressure limit of the geological body reaches 44.9 MPa, providing a solid geological foundation for gas storage construction. The proposed scheme achieves a working gas volume of over 9.0×10⁸ m³, a daily peak-shaving capacity of nearly 0.1×10⁸ m³, and an expected increase in crude oil recovery of approximately 20 percentage points compared to water flooding. These results confirm that converting blocky volatile oil reservoirs into gas storage is technically feasible, economically effective, and the associated methodologies can serve as an important reference for similar reservoirs aiming to simultaneously enhance oil recovery and provide gas storage peak-shaving services.

Key words: massive volatile oil reservoirs, underground gas storage rebuilt from oil reservoir, trap sealing property, storage capacity parameters, feasibility studies

CLC Number:

P624
TE972

SHANG Lin, HE Haiyan, GAO Guangliang, SUN Yanchun, WANG Miao, LI Cong. A Study on the Geological and Gas Reservoir Engineering Plan for PG2 Underground Gas Storage[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(4): 81-93.

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