盖层封闭性是保障储气库平稳安全运行的关键地质因素之一。泥质岩作为优质的油气封盖层,循环应力下其封闭能力的演化规律尚不明确,制约了此类储气库的建设进展,为此,利用PFC进行循环应力加卸载数值模拟试验,分析泥质岩盖层静态封闭能力...盖层封闭性是保障储气库平稳安全运行的关键地质因素之一。泥质岩作为优质的油气封盖层,循环应力下其封闭能力的演化规律尚不明确,制约了此类储气库的建设进展,为此,利用PFC进行循环应力加卸载数值模拟试验,分析泥质岩盖层静态封闭能力,表明循环应力下泥质岩盖层的封闭能力有增强趋势,研究成果可为地下储气库盖层稳定性分析及运行参数设计提供理论指导。Closure of cap layer is one of the key geological factors to ensure the stable and safe operation of gas storage. As a high-quality oil and gas capping layer, the evolution law of its sealing capacity under cyclic stress is still unclear, which restricts the construction progress of this kind of gas storage reservoir. Therefore, the numerical simulation test of cyclic stress loading and unloading is carried out by using PFC to analyze the static sealing capacity of argillous rock cap, which shows that the sealing capacity of argillous rock cap is increasing under cyclic stress. The research results can provide theoretical guidance for the stability analysis and operation parameter design of underground gas storage cap.展开更多
文摘盖层封闭性是保障储气库平稳安全运行的关键地质因素之一。泥质岩作为优质的油气封盖层,循环应力下其封闭能力的演化规律尚不明确,制约了此类储气库的建设进展,为此,利用PFC进行循环应力加卸载数值模拟试验,分析泥质岩盖层静态封闭能力,表明循环应力下泥质岩盖层的封闭能力有增强趋势,研究成果可为地下储气库盖层稳定性分析及运行参数设计提供理论指导。Closure of cap layer is one of the key geological factors to ensure the stable and safe operation of gas storage. As a high-quality oil and gas capping layer, the evolution law of its sealing capacity under cyclic stress is still unclear, which restricts the construction progress of this kind of gas storage reservoir. Therefore, the numerical simulation test of cyclic stress loading and unloading is carried out by using PFC to analyze the static sealing capacity of argillous rock cap, which shows that the sealing capacity of argillous rock cap is increasing under cyclic stress. The research results can provide theoretical guidance for the stability analysis and operation parameter design of underground gas storage cap.
