基于时序InSAR技术监测胜利油田地表沉降

Study on surface subsidence of Shengli Oilfield based on InSAR technology

胜利油田位于山东省东营市,地处黄河三角洲地区,地表覆盖20~50m厚的沉积层,沉积层的自然压实和油区的油气资源开发加速了地表的下沉。本文基于时序InSAR技术,利用28景ALOS影像获取了东营市东营区胜利油田的地表沉降速率以及沉降的序列时间。结果表明,在2007年至2011年间,市区出现较为缓慢的沉降趋势,而胜利油田油区则出现了一个大的沉降漏斗,最大沉降速率超过19mm/y。依据沉降分布范围可推测该地区的地表沉降与油气开采活动有关。

Shengli Oilfield in Dongying City,Shandong Province,is located in the Yellow River Delta region,the surface covered with 20 ~ 50 m thick sedimentary layer. The natural compaction of the sedimentary layer and the extraction of oil and gas accelerate the development of the surface subsidence.Based on Multi-temporal InSAR technique,the land subsidence rate and settling time series of Shengli Oilfield are obtained. The results show that there is a relatively slow subsidence trend in the city area between 2007 and 2011,while in the Shengli Oilfield,there is a large sedimentation funnel with a maximum sedimentation rate of more than 19 mm/y. According to the distribution of sedimentation,it is speculated that the surface subsidence is mainly related to oil and gas exploration activities.