【摘要】 储气库盖层在天然气注入过程中可能发生破坏或变形。为确保注入的天然气安全储存于地下含水层储气库,以拟建含水层储气库为依托工程,建立含水层储气库地层结构模型,研究天然气注入含水层产生的超压和应力等变化及其对储气库盖层力学完整性的影响;考虑盖层参数、天然气注入速率和地应力因数等因素,对盖层最大位移及剪切、拉伸破坏的影响进行敏感性分析。结果表明:在相同条件下,天然气注入速率对盖层的最大水平位移和垂向位移影响最为显著,地应力因数对盖层的剪切、拉伸破坏影响最为显著。实际工程实践中,在规划深层地质构造天然气注入方案时,应首先考虑盖层渗透系数、天然气注入速率和地应力因数。更多还原

【Abstract】 The caprock may be damaged or deformed in the process of gas storage injection.In order to ensure that the natural gas injected into the aquifer gas storage can be safely stored in the underground aquifer gas storage,the mechanical integrity of caprock during the gas injection stage is very improtant.Based on a proposed aquifer gas storage project,a stratum structure model of the aquifer gas storage is established to study the influence of overpressure and stress change caused by natural gas injection into the aquifer on the mechanical integrity of the caprock of the gas storage.The sensitivity analysis of caprock parameters,in-situ stress coefficient,and injection rate on shear failure,tensile failure and maximum displacement of caprock is also considered.The results show that under the same conditions the injection rate has the most significant effect on the maximum horizontal displacement and maximum vertical displacement of the caprock,and the stress coefficient has the most significant effect on the shear and tensile failure of the caprock.In the actual engineering practice,when planning the natural gas injection scheme in deep geological structure,we should first pay attention to the caprock permeability,natural gas ingection rate and in-situ stress coeffcient.更多还原