呼图壁地下储气库近期垂直位移形变特征研究

STUDY ON SURFACE VERTICAL DEFORMATION CHARACTERISTICS OF DISPLACEMENT IN HUTUBI UNDERGROUND GAS STORAGE

围绕目前中国最大的枯竭式油气藏储气库呼图壁地下储气库,新疆地震测绘研究院于2013~2018年对其进行垂直向位移监测,获取了11期二等水准数据并进行相关分析。研究结果表明:储气库区随着注采气压以及天然气荷载变化呈现明显的周期性变化趋势,主要形变特征表现为经过冬季采气期间储气库内部气压减小以及天然气荷载减少,储气库区呈现整体隆升趋势;而在夏季注气后储气库内部气压增大及天然气荷载增加,储气库区呈现整体下沉趋势。另外测区北部测点沉降除了受储气库因素影响外,还主要受到地下水抽采因素的影响。

Around the Hutubi underground gas storage,the largest depleted oil and gas reservoir in China,Xinjiang Institute of seismic surveying and mapping carried out vertical displacement monitoring from 2013 to 2018,and obtained 11 phase II level data and conducted relevant analysis.The results show that the gas storage presents obvious periodic change trend with the change of injection and production pressure and natural gas load,and the main deformation characteristics are as follows:during the period of gas production in winter,the internal pressure of the gas storage and the load of natural gas decreases,so the gas storage shows an overall rising trend;after gas injection in summer,the internal pressure of the gas storage and the load of natural gas increases,so the gas storage area presents an overall downward trend.In addition,the settlement of the northern survey point is mainly affected by the factors of gas storage and groundwater extraction.