泥岩夹层对层状盐岩体中储库稳定性影响

Influence mudstone interlayer on stability of oil storage in laminated salt rock

针对盐矿常为不同岩层交替而成的互层盐岩体的基本特点,利用宏观平均意义下考虑细观弯曲效应的三维 Cosserat介质扩展本构模型的 FLAC^(3D)接口程序,对湖北云应地区的 ZK1075,ZK1083,ZK1099溶腔进行了计算,不仅考虑了刚度异于盐岩的泥岩对复合体弹性特征的影响,并且考虑了由于各层内部位移协调引起泥岩夹层先行破损,进而引起复合体变形和破坏。计算结果表明,云应地区的层状盐岩体中的刚度、强度较大的泥岩夹层对层状盐岩复合体具有强化作用,对盐岩溶腔造腔后的稳定性有利。

Considering the laminated geologic characteristics of salt rocks in China,the stability of ZK1075,ZK1083 and ZK1099 salt caverns in Yun-Ying area of Hubei Province is analyzed by the FLAC3D interface program of the new three-dimensional expanded Cosserat medium constitutive model.Besides dealing with the effect of the stiffness difference between mudstone and rock salt on elastic characteristics of the composite,it also considers that displacement correspondence between layers results in mudstone's fracture firstly and then leads to the deformation and failure of composite.The results show that the mudstone interlayer in laminated salt rock in Yun-Ying area will restrict the deformation of rock salt owing to its larger stiffness and strength;and the presence of mudstone interlayer plays an active role in the stability of the oil/gas storage.