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针对我国须采用密集库群来提高油气地下存储中资源利用率的现状,对近置已有盐岩溶腔库群运营模式下储库稳定性和收缩变形展开了研究。基于声纳测腔成果,建立了符合实际存在的单腔模型及库群模型。对模拟结果进行了对比分析,明确了库群运行模式对储库稳定性的影响规律。发现储库相对位置和深度的差异、夹层地层倾角的存在、相邻储库体积和形状的不等同3个因素会导致某些腔体的收缩变形不对称、腔体形变不规则;不同于单腔的最大位移区域固定出现在腰部,库群模式下受周围腔体的影响,而并无固定的腔壁位移最大点位置;呈现板状存在贯穿整个库群的泥岩刚度大、蠕变性能低,并且其和盐岩交界面的抗剪能力较强,可以提高库群的整体性和稳定性;考虑地层倾角的夹层变形特性成为对库群密闭性不利的影响因素,泥岩-盐岩交接面的拉伸以及泥岩夹层本身的扭转弯曲会使泥岩层产生裂隙,贯通的裂隙可导致各个腔体失去独自运行的能力,影响储库运行效率。
Aiming at the current situation that China should use the intensive reservoir group to improve the resource utilization rate in the underground storage of oil and gas, the stability and shrinkage deformation of the reservoir in the near existing salt cavern cluster are studied. Based on the results of sonar cavity measurement, a single cavity model and a reservoir group model are established. The simulation results are compared and analyzed, and the influence laws of reservoir group operation mode on the stability of reservoir are clarified. It is found that the difference between the relative position and depth of the reservoir, the existence of the dip of the interlayer and the unequal volume and shape of the adjacent reservoirs will result in asymmetric shrinkage of some cavities and irregular cavity deformation. The maximum displacement of the cavity is fixed at the waist, which is influenced by the surrounding cavities in the reservoir group mode, but there is no fixed maximum displacement of the cavity wall. The presence of plate-like mudstone has large rigidity and low creep performance , And its shearing ability at the interface with salt rock is strong, which can improve the integrity and stability of the reservoir group. Considering the interlayer deformation of interlayer inclination becomes the unfavorable influence on the hermetic sealing, the interface between mudstone and salt rock And the twisting and bending of the mudstone interlayer itself will cause cracks in the mudstone layer. The penetrating cracks may cause each cavity to lose its ability to operate alone and affect the operation efficiency of the reservoir.