枯竭气藏型储气库中地质力学问题浅谈

Brief Discussion on Problems of Geomechanics in Depleted Gas Reservoirs

枯竭气藏改建地下储气库具有地层构造已知、建库周期短、投资费用小等优点,但其对密封性及地质条件要求高,潜在的地质力学问题较其它种类储气库要复杂得多。本文总结了枯竭气藏型储气库建设和运行中所面临的地质力学问题及其研究现状,并就H储气库存在的循环注采诱发应力场变化导致地表形变及断层活化的地质力学问题,提出采用区域地震事件研究、地质力学分析以及地质力学耦合建模相结合的思路与方案进行研究,所得结果有利于确定储气库安全运行压力范围,为储气库库容建设提供重要参考。

The rebuilding of underground gas storages from depleted gas reservoirs has the advantages of known strata structure,short construction period,and low investment costs.However,it has high requirements for tightness and geological conditions,and the potential geomechanical problems are more complex than those of other types of gas storages.This paper summarizes the geomechanical problems and their research status in the construction and operation of depleted gas reservoirs.With regard to the geomechanical problems of H gas storage inventory,the cyclical injection-induced stress field changes lead to surface deformation and fault activation.The idea and scheme of regional seismic event research,geomechanical analysis and geomechanical coupling modeling are proposed.The research results can be used to determine the safe operating pressure range of gas storage and provide an important reference for gas storage capacity construction.