地下储气库在注采运行过程中,频繁的压力波动会扰动地层应力场,进而可能诱发断层活化,严重威胁储气库密封性。针对该问题,基于流-固耦合机制建立枯竭气藏储气库仿真模型,分析地层参数在周期性注采下的动态演化规律,研究注采速率与注采位置对断层稳定性的影响。结果表明:在储气库注采过程中,注采井对应断层位置的孔隙压力及有效应力在周期性注采中变化显著,储层顶部与注采井对应的断层投影位置,是易引起断层滑移的高风险区域;注采速率越大、注采井位置与断层间距越小时,储层孔隙压力增加幅度越显著,更易对邻近断层处的应力场造成扰动,增加断层滑移风险。该研究可为地下储气库断层稳定性评估与注采工艺优化提供理论依据。
During injection-production operations of underground gas storage facilities,frequent pressure fluctuations disturb the in-situ stress field and may induce fault reactivation,seriously threatening sealing integrity.To solve this problem,a simulation model of underground gas storage in a depleted gas reservoir was established based on fluid-solid coupling mechanisms;the dynamic evolution of formation parameters under cyclic injection-production was analyzed;and the impacts of injection-production rate and injection-production location on fault stability were investigated.Results show that during injection-production of underground gas storage,pore pressure and effective stress at the fault location corresponding to the injection-production well change significantly under cyclic injection-production.The reservoir top and the fault-projection position corresponding to the injection-production well constitute high-risk areas prone to fault slip.Higher injection-production rates and smaller distances between injection-production locations and the fault lead to greater pore-pressure increase in the reservoir,more likely disturbing the stress field near the adjacent fault and increasing the risk of fault slip.This study provides a theoretical basis for fault-stability evaluation and optimization of injection-production processes for underground gas storage facilities.
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