Deformation Monitoring Using Time Series InSAR Technology Over Oilfield

Petroleum called "the blood of modern industry" is an important basic energy source for a country's industrialization.The negative impact of extraction process cannot be ignored when oil provides an important driving force for the world economy.Fluid extraction or injection may cause changes of reservoir pressure,which can cause deformation of the earth surface,manifested as subsidence or uplift.Excessive surface deformation may threaten infrastructure of oil field and its surrounding areas,such as underground oil and gas pipelines,highways,railways,and buildings.Therefore,the monitoring of surface deformation caused by oil production activities is not only important for the safe production of oilfields and safety assessments of surrounding infrastructure but also can exert valuable constraints on the dynamic behavior of the reservoir over time.In large-scale surface deformation monitoring,Interferometric Synthetic Aperture Radar(InSAR)with wide range,high accuracy and high resolution capability is widely used.However,the technology itself has some limitations,such as temporal and spatial baseline decorrelation and DEM error.The time-series InSAR technology emerging in recent years has effectively overcome the above limitations,and can also obtain long-term sequence monitoring results.In addition,in view of the problem that radar side-view imaging characteristics can only obtain line-of-sight surface deformation,some people have proposed a two-dimensional time-series deformation estimation method that simultaneously estimates the vertical and east-west directions.This paper takes the surface deformation of Karamay oilfield in Xinjiang as the main research object and uses SAR satellite images to conduct surface deformation research based on time series InSAR technology.And then combining the geophysical inversion model to invert the parameters of typical oilfield deformation regions,which obtain the parameter information of the oilfield reservoir.The paper uses the information to analyze correlation between the occurrence of minor earthquakes in the oilfield area and oil recovery activities.The main research contents of this article are as follows:(1)Introduce the conventional InSAR technology and systematically analyze several time series InSAR technologies and characteristics,and provide references for the subsequent selection of related research methods.(2)Using Stacking and SBAS technology to monitor and analyze the surface deformation of Karamay oilfield area,selected 32 scenes of ascending orbit data and 34 scenes of orbit deceleration data from March 2017 to August 2018 in the area,respectively Annual average deformation rate map and time series evolution characteristics of Karamay oilfield.(3)In response to the radar side-view imaging can only obtain one-dimensional deformation in the line of sight,a two-dimensional deformation estimation method integrating SAR image data is studied to analyze the surface deformation and the deformation mechanism of the oilfield area.The experiment was carried out by using Sentinel-1A/B datas covered Karamay oilfield area to obtain the spatial and temporal distribution and evolution characteristics of the two-dimensional deformation in this area.(4)According to the deformation characteristics and deformation-inducing factors of the study area,two physical inversion models were used to analyze the correlation between the regional deformation and production activities of oil and gas,and then we analyze the correlation betweween the regional surface deformation of oil fields and the occurrence of earthquakes.