Deformation Monitoring And Numerical Simulation Research Of A Seasonal Underground Gas Storage In Xinjiang

In the study of underground gas storage project, injection-production change in absorption release and repeated the process to induce boundary fault activity and the surface deformation is the key to the safe and stable operation of engineering. This research mainly in Xinjiang, China’s largest underground gas storage, injection-production pressure change has the strongest signal of the deformation, change with irregular injection-production pressure conditions, in the process of repeated loading and unloading, underground gas storage rock cover layer and the gas storage fault will produce a series of elastic deformation, as well as the fault activity associated with reservoir research.In this paper, by using gas reservoir deformation monitoring network has been built based on GPS, the horizontal displacement of high precision measurement and precision leveling settlement observation technology, 3D deformation results obtained in the process of injection and production gas reservoir with the change of pressure under the surface, and the high precision 3D deformation results are adjusted analysis. At the same time, combined with the mechanical characteristics of rock, the geological conditions of traps, the elastic model, the establishment of three-dimensional finite element model with the injection pressure, the station three dimensional measurements as reservoir deformation space boundary constraints, by 3D nonlinear finite element simulation to carry out the numerical simulation and analysis of the reservoir changes. Through comparative analysis of the experimental results with simulation value to judge the accuracy of the model, so as to further analysis and prediction of surface deformation law of load under the action of the reservoir internal stress strain relationship of surface subsidence, the safe operation of pressure, the numerical simulation analysis of underground gas storage in Xinjiang, the relationship between stress and pressure- deformation. At the same time, analysis of characteristics and stability of underground gas storage and safe operation of the fault movement in the process, to further improve the safety of underground engineering, and the safe operation of the reservoir evaluation, protection of Xinjiang underground gas storage safe and smooth operation.