盐岩层中天然气存储洞室围岩长期变形特征

盐岩层中天然气存储洞室围岩长期变形特征 English Version

基金项目: 教育部留学回国人员科研启动基金资助项目

摘要: 采用有限差分法软件FLAC3D对一天然气存储地下盐岩洞室围岩的流变数值分析表明,由于盐岩的大流变特性,盐岩层中的稳定应力场具有静水压力的特征,这一点对围岩的稳定有十分重要的意义。在设计平均天然气内压6MPa条件下,当达到设计使用年限(80a)时,洞室的剩余存储能力仍保有初始存储能力的27 5%。考虑模型尺寸效应及模型边界条件的影响,计算结果为相对保守的可靠估计。
- 天然气存储 /
- 盐岩洞室 /
- 流变 /
- 体积收敛
Abstract: The numerical creep analyses on salt rock surrounding a gas storage cavern using the FDMsoftware FLAC3D show that, since salt rock creeps heavily under stress, the stable stress field in the salt rock strata has the characters of hydrostatical pressure, which is very important for the stability of salt rock surrounding a cavity. Under an average inner gas pressure of 6 MPa, which is designed for a salt cavern located at 1000 m to 1340 m depth, the surplus storage capability of the cavern will remain 275% of the original capability after 80 designed operation years. Taking into account the scale and boundary condition effects of the model, the numerical results have been proved to be a relatively conservative reliable valuation.
- gas storage /
- cavern in salt rock /
- creep /
- volume convergence