油藏型储气库作为近年来国内外发展的一种新型开发模式，且中国许多含油构造具有改建储气库的条件，在进一步提高中国油藏采收率、丰富储气库类型和保供区域需求方面有着广泛的应用前景。利用大港油田板深37断块全直径岩心和依据油藏建库注采模式特点，设计多周期驱替交变实验，分析了砂岩油藏改建储气库渗流机理和构建了油藏改建储气库单井产能预测模型。实验结果表明：①气体对水和油均具有驱替和抽提作用，在提高储气库库容中起正向作用；②在气驱水和气驱油多周期驱替交变实验中（分别模拟含水层或水驱油藏开采后期和开发早期的油藏改建储气库），明确扩容能力随着注采次数增加呈幂函数关系，最终扩容能力分别为0.277 3、0.337 4 PV，且适当降低储气库最低运行压力可以实现更好的扩容；③在气驱油水多周期驱替交变实验中（模拟实际开发中的油藏改建储气库），明确在油水共存条件下，含水饱和度越高（实验建立岩心的初始含水饱和度分别为47.04%、63.50%），储气库扩容的能力越弱（实验扩容能力分别为0.325 1、0.318 5 PV）；④基于油气相渗曲线测试结果，提出了不同于数值模拟的油藏改建储气库单井产能快速预测方法，建立不同注采轮次下的产能方程和无阻流量。研究成果为油藏改建储气库的早期库容分析和产能设计提供了重要指导。

Reservoir-converted gas storage has emerged as a new development approach worldwide in recent years. Many oil-bearing structures in China meet the conditions for conversion into gas storage, offering broad application prospects for improving oil recovery rates, diversifying gas storage types, and meeting regional gas supply demands. Using a full-diameter core from the Banshen 37 fault block in the Dagang Oilfield and based on the injection-production patterns of reservoir-converted gas storage, a multi-cycle displacement alternating experiment was designed to analyze the seepage mechanisms of converted gas storage in sandstone oil reservoirs and establish a single-well productivity prediction model. The experimental results demonstrate that: (1) Gas exhibits both displacement and extraction effects on water and oil, positively contributing to the enhancement of gas storage capacity. (2) In multi-cycle displacement alternating experiments of gas-water and gas-oil displacement (simulating the late-stage development of water-bearing layers or water-driven oil reservoirs and the early-stage development of converted gas storage in oil reservoirs, respectively), the storage capacity expansion follows a power-law relationship with the number of injection-production cycles, ultimately reaching 27.73% and 33.74%, respectively. Moreover, appropriately lowering the minimum operating pressure of the gas storage can enhance storage capacity. (3) In multi-cycle gas-oil-water displacement alternating experiments (simulating the actual development of converted gas storage in oil reservoirs), under oil-water coexistence conditions, higher water saturation weakens the expansion capacity of the gas storage (with initial water saturation of the core in the two experiments at 47.04% and 63.50%, respectively, leading to expansion capacities of 32.51% and 31.85% , respectively); ④ Based on relative permeability curve tests, a rapid prediction method different from numerical simulation was proposed for single-well productivity of converted gas storage in oil reservoirs. Productivity equations and absolute open flow under different injection-production cycles were established. The findings provide essential guidance for early-stage storage capacity analysis and productivity design of converted gas storage in oil reservoirs.