新疆呼图壁地下储气库的GPS/InSAR监测及地质力学模拟研究

项目名称： 新疆呼图壁地下储气库的GPS/InSAR监测及地质力学模拟研究

项目编号： No.41474097

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 乔学军

作者单位： 中国地震局地震研究所

项目金额： 102万元

中文摘要： 新疆呼图壁地下储气库(HTBUGS)是我国目前运行的最大储气库,生产库容达45亿立方米,对天然气的季节性调峰、应急调度具有重要作用.但储气库(UGS)在气体注采过程中,由于周期性载荷与压力的改变,流固体的耦合作用，引起孔隙流体压力的变化,造成储层岩石的空隙弹性变形和疲劳破坏,不但产生应力与体积变化,引起UGS盖层地表的呼吸性变形,而且有可能引起储层岩体裂纹扩张,造成断层活化并诱发地震.因此本项目将采用连续与流动GPS观测,结合InSAR技术,在获取HTBUGS注采气过程三维形变的基础上,以地震地质,地球物理及储气井的压力与气量等参数为约束,建立3D地质力学模型,开展数值模拟与分析,结合储气库及周边的地震活动性,储层岩石属性及地质构造分布,研究UGS盖层岩石的变形与力学特征,探索地层压力与孔隙弹性变形的关系,揭示HTBUGS及周边断层的活化与扩展特性,为调节天然气的注采量提供安全参考.

中文关键词： 地下储气库；形变监测；地质力学模型；GPS；InSAR

英文摘要： The Hutubi Underground Gas Storage(HTBUGS) Reservoir of Xinjiang Province is the largest operating reservoir of China up to now. Its producing capabilty is about 4.5 billion cubic meter. It plays an important role in seasonal gas peak regulation and emergency dispatch. However, the presures imposed on the rock within UGS are changabel and regular during gas injection or extraction period. It will cause the changes of porous fluid pressure and porous elastic deformation and then result in stress and volume changes of UGS rock, which not only generate the breath-style deformation on the surface of UGS cover but also induce rock fracture expansion and fault activation as well as earthquakes. There are a lot of such examples all around the world. Therefore, the first aim of this proposal intends to get a three dimensional time series crustal deformation field at HTBUGS by continous and rove GPS as well as InSAR measurements. Secondly, it will carry out geomanchanical simulations and analysis constrained by seismic data,geology data, geophysic data ,well pressures and gas volume changes. Thirdly, it will study the deformation & mechanical characteristics of UGS rock and the relationship between porous fluid pressure and porous elastic deformation based on reginal seismic activites, rock properties and tectonic distributions. Finally, it will reveal the status of fault activation and extension features within HTBUGS and its surrouding areas. We wish provide a seismic risk assessment and suggestion on gas injection and extraction during peak regulation.

英文关键词： Underground Gas Storage Reservoir;Crustal Deformation monitoring;Geomechanical Model;GPS;InSAR