基于InSAR的涩北天然气田地表形变监测与开采特征反演

Ground Deformation Monitoring and Exploitation CharacteristicsInversion of the Sebei Gas Field Based on InSAR

利用多颗SAR卫星数据,使用时序InSAR技术恢复涩北气田自1996年正式开发以来的地表形变时间序列。结果表明,涩北1号气田地表1996~2003年保持稳定,2003~2005年出现明显隆升,2005~2018年快速沉降。此外,本研究基于均匀弹性半空间模型反演涩北1号气田在2015~2018年天然气开采与地表形变之间的关系。研究表明,随着天然气开采量的增加,涩北气田地表沉降量也随之增加,而开采深度则先增加后稳定,并于2017年后稳定在2 300 m。本研究还计算InSAR反演的地下天然气储层在标准状态下的体积,结果显示,InSAR反演结果与实际统计数据差异极小,表明InSAR监测和反演结果具有可靠性。本文结果可为涩北气田的安全生产以及周边基础设施的健康运行提供重要的地表形变数据。

We use multiple SAR satellite data,and adopt the time-series InSAR technique to restore the ground deformation time series of the Sebei gas field since its formal development in 1996.The results show that the surface of Sebei No.1 gas field remained stable from 1996 to 2003,experienced significant uplift from 2003 to 2005,and rapidly subsided from 2005 to 2018.We use the uniform elastic half-space model to invert the relationship between natural gas exploitation and ground deformation in the Sebei No.1 gas field from 2015 to 2018.It’s shown that the amount of surface subsidence in the Sebei gas field increased with the increase of natural gas exploitation volume,while the exploitation depth increased first and then stabilized at 2300 m after 2017.Furthermore,we also calculate the volume change of underground natural gas reservoir inverted by InSAR under standard conditions.The results show that the difference between the InSAR inversion results and actual statistical data is very small,verifying the reliability of InSAR monitoring and inversion results.The results of this study can provide important ground deformation data for the safety production of Sebei gas field and the healthy operation of surrounding infrastructure.