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利用在呼图壁地下储气库开展的2013~2015年7期二等水准测量获得的高差数据,对受地表气井压力变化影响而发生的地下储气库地表垂直变形进行了分析。研究表明,呼图壁地下储气库区的地表变形除了构造成因引起的盆地下沉以外,其他成因有2个方面:一个是呼图壁地区的地下水超采影响着该地区的地表垂直变化;另一个是储气库集采气期间受井口压力变化影响的地表沉降,根据计算,储气库每MPa气井压力变化影响到的地表变化为0.625~1.125mm。
Based on the elevation data obtained from the second-level leveling survey of Hutubi underground gas storage station from 2013 to 2015, the vertical deformation of the underground gas storage surface caused by the pressure change of the surface gas well was analyzed. The study shows that there are two other causes of surface deformation in the Hutubi underground gas storage area besides the structural sinking of the basin: one is that the groundwater overrun in the Hutubi area affects the vertical variation of the surface of the area; The other is the surface subsidence caused by the change of well head pressure during gas storage during gas storage. According to calculation, the change of gas pressure per gas well in gas storage varies from 0.625 to 1.125 mm.