朱家墩储气库密封性评价

Sealability evaluation of Zhujiadun underground gas storage

朱家墩气藏处于开发后期接近枯竭阶段,作为储气库选址具有先天优势。气藏砂岩储层仅20 m左右,上覆泥岩厚度约600 m,具有良好的侧向封挡条件。通过泥岩盖层厚度分布、突破压力和三轴加卸载同步渗透率测试,朱家墩储气库可满足60个周期循环注采;通过断层的静态和动态密封性评价,进一步论证朱家墩气藏改建储气库的密封性和可行性。在储气库上限压力用原始地层压力不会破坏其密封性,适合建库。

Zhujiadun gas reservoir is in the near-exhaustion stage at the later stage of development,and has inherent advantages as a gas storage location.The sandstone reservoir of the gas reservoir is only about 20 m,and the thickness of the overlying mudstone is about 600 m,which has good lateral sealing conditions.Through mudstone caprock thickness distribution,breakthrough pressure,and triaxial loading and unloading simultaneous permeability tests,Zhujiadun gas storage can meet 60 cycles of injection and production.Through the static and dynamic sealing performance evaluation of the fault,the sealing performance and feasibility of the Zhujiadun gas reservoir to be rebuilt into the gas storage are further demonstrated.Using the original formation pressure at the upper limit pressure of the gas storage will not damage its sealing performance,so it is suitable for the construction of gas storage.