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呼图壁地下储气库地表盖层变形的GPS研究
王迪晋1) 李瑜2) 聂兆生1) 王坦2) 乔学军1) 李杰3) 余鹏飞1) 程瑞忠3)
1)中国地震局地震研究所,武汉市武昌区洪山侧路40号 430071;2)地壳运动监测工程研究中心,北京 100045;3)新疆维吾尔自治区地震局,乌鲁木齐 830011
摘要:
利用新疆呼图壁地下储气库地表盖层由13个点位组成的形变监测网的前5期GPS观测资料,研究地下储气库注采过程中地表盖层的变形响应。通过获取地下储气库运行过程中地表盖层形变的三维时间序列,并结合井口压力数据,区分地下储气库在不同过程中的变形信号。研究结果表明,地表盖层在储气库注采过程中水平方向上存在明显的“呼吸效应”,储气库每MPa气井压力变化在注、采周期内对地表变形造成的影响在水平方向上分别达到1.02、1.24mm,垂直方向分别达到-1.11、0.86mm。
关键词:  地下储气库  GPS观测  三维时间序列  变形响应
DOI:
分类号:
基金项目:
Study on the Cap Rock Deformation of Hutubi Underground Gas Storage by GPS Observations
Wang Dijin1) , Li Yu2) ,Nie Zhaosheng1) ,Wang Tan2) ,QiaoXuejun1) ,Li Jie3) ,Yu Pengfei1) , and Cheng Ruizhong3)
1)Institute of Seismology, China Earthquake Administration, Wuhan 430071, China;2)National Earthquake Infrastructure Service, Beijing 100045, China;3)Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China
Abstract:
The deformation responses of surface cap rocks of Underground Gas Storage (UGS) in Hutubi, Xinjiang during gas injection and production were investigated with the GPS data recorded by the deformation monitoring network, which includes 13 observation sites. The time series of three-dimensional deformation of the surface cap rocks was obtained in the UGS operation process, and the deformation signals in different phases were identified by combining the GPS data with wellhead pressure data. The results show that the respiration response of surface cap rock deformation is obvious during gas injection and production of UGS, and the surface deformation due to a 1MPa change of wellhead pressure is 1.02mm in gas injection and 1.24 mm in gas production horizontally, and 1.11mm in gas injection and 0.86mm in gas production vertically.
Key words:  Underground gas storage  GPS observations  Three-dimensional time series  Deformation response