| With the sustained,rapid and healthy development of China’s economy,energy issues have become increasingly prominent and become a major problem of restricting China’s economic and social development and national security.The Hutubi Underground Gas Storage(HTBUGS)Reservoir of Xinjiang Province is the largest operating reservoir of China up to now.Its producing capability is about 4.5 billion cubic meter.It plays an important role in seasonal gas peak regulation and emergency dispatch.However,the pressures imposed on the rock within UGS are changing 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,strengthen the deformation monitoring of UGS and carry out the corresponding geomechanical,seismic geological and geophysical studies will help us understand tectonic features of the gas storage reservoir,rock stress-strain state and the rule of seismic activity with gas injection pressure changes,etc.It has theoretical and practical significance to ensure the stability of gas storage and efficient operation.Synthetic Aperture Radar differential interferometry technology is a high-precision,high spatial and temporal resolution,covering a wide range of surface deformation monitoring technology,is widely used in volcanoes monitoring,earthquakes monitoring,glaciers monitoring,etc.We use SBAS-InSAR time series analysis method obtained the LOS toward deformation time series of underground gas storage of Hutubi during the period between August 2013 and August 2014.The paper take a preliminary analysis of the temporal deformation characteristics and influencing factors of the study area based on the deformation results and use Mogi model to simulate the deformation characteristics of the study area moreover.The main research results are as follow:1)Using SBAS-InSAR technique to process the high-resolution of the TerraSAR-X data that was acquired the date between August 2013 and August 2014,and obtain the LOS toward deformation time series of underground gas storage in Hutubi.The results show that the deformation characteristics of whole UGS are non-continuous distribution,deformation and injection(mining)gas pressure has good correlation,that is mean during gas injection period,gas storage surface uplift overall;during gas production period,gas storage surface subsidence overall.During the gas injection and gas production,the deformation peak values along the line of sight to the satellite(LOS)is 10 mm and-8mm,respectively.2)According to the deformation time series obtained by InSAR technique,combined with the geological condition,groundwater level change,human production and construction activities and other relevant information in Hutubi areas,we take a preliminary analysis of the temporal characteristics of underground gas storage in Hutubi and the relationship between deformation characteristics and influence factors.3)Using the model that most common in volcanic research named Mogi model to simulate and analyze the deformation of underground gas storage happened during operation.The Simulation results show the surface deformation of gas storage can be up to 7mm during the gas injection operation,while the surface deformation of gas storage can be up to-4mm during the gas production operation.The residual results of Mogi model show that the Mogi simulation of the injection and production concentrated areas are high precision,which error range between-2mm and 1mm,while the areas surrounding gas storage are lower precision,which error range between-4mm and 2mm.Finally to summarize the contents and results of this research and give some suggestion for the later research work... |
PDF Full Text Request