Time-series InSAR Monitoring Of Surface Deformation And Reservoir Parameter Inversion In Oilfield Injection And Production Areas

Oil is an important strategic resource of a country,and its safe and sustainable production is related to national economic and social stability.Oilfield production generally adopts injection – a production combination operation mode.Water injection is the main means of oil exploitation.However,the injection-production operation in the oilfield is easy to cause the change of underground reservoir pressure,which is easy to cause the local deformation of oilfield surface and induce casing damage.Oilfield surface deformation monitoring can identify the main deformation area and possible casing damage area,which is of great significance to adjust oilfield operation planning,rationally exploit underground resources and guide high-quality development of oilfield.Synthetic Aperture Interferometry(InSAR)technology can realize large-scale and high-precision surface deformation monitoring,but the traditional time series InSAR technology still faces the problems of insufficient number and uneven spatial distribution of measuring points in the oil field area with complex surface coverage.Taking Daqing oilfield as an example,this thesis adopts fused distributed target interferometry(DS-InSAR)technology to carry out surface deformation monitoring,and analyzes the effects of long time series natural factors and short time series human factors on surface deformation in Daqing oilfield,which provides a scientific basis for guiding oilfield production and further expands the application of InSAR technology in oilfield area.The main research work and results of this thesis are as follows:(1)According to the characteristics of seasonal frozen soil deformation,this thesis integrates the periodic model into the DS-InSAR technology to carry out the surface deformation monitoring of Daqing Oilfield,and obtains the long-term surface deformation results of the oilfield from May 2015 to November 2019.The results show that the frozen soil periodic model can effectively simulate and extract the long-term frozen soil deformation in Daqing Oilfield,and compensate for the residual terrain residual and atmospheric error caused by the frozen soil periodic deformation.At the same time,the model weakens the interference of deformation caused by seasonal frozen soil characteristics in the corresponding period to determine the magnitude of oilfield production deformation.(2)In this thesis,based on the surface deformation results of short-time series of oil fields and the corresponding wellhead operation information of oil fields,the correlation between surface deformation in oil fields and injection-production volume of oil fields is analyzed.The results show that the surface deformation trend in the oilfield area is highly correlated with the change trend of oilfield operation,and it is a non-linear surface deformation that changes with the injection and extraction operation,and the high-pressure injection and extraction leads to different degrees of surface uplift and subsidence.(3)Based on the monitoring results and the characteristics of oilfield deformation,the inversion of reservoir parameters of single-source model and multi-source model in oilfield area at different scales is carried out by using geophysical model,and the accuracy and reliability of inversion results of different models are compared and analyzed.The results show that the ellipsoid model is more suitable for inversion of reservoir parameters in Daqing Oilfield,and the inversion results have high reliability.The research results can reflect the change information of reservoir state caused by oil exploitation,and provide scientific and technological support for oilfield operation planning.There are 39 figures,5 tables and 99 references.