盐岩夹层蠕变特性实验研究与理论分析

通过对湖北应城盐岩夹层160 d的单轴压缩蠕变试验研究,可知湖北应城盐岩夹层具有良好的蠕变特性,盐岩夹层蠕变来自两部分,一部分为盐岩蠕变,另一部分来自夹层蠕变,且纯盐岩蠕变率高于夹层,横向应变率大于夹层。根据试验结果,拟合试验曲线得出了盐岩夹层蠕变经验公式,由最小二乘法得到盐岩夹层蠕变经验公式拟合参数;并分析了曲线特征,建立了盐岩夹层蠕变理论模型,得出了盐岩夹层的粘弹塑性本构方程,为盐岩矿床油气储库的稳定性分析提供了依据。

Experimental Study and Theoretic Analysis on Creep Property of Rock Salt Interlayer

According to the uniaxial compressive creep experiments of Hubei Yingcheng rock salt interlayer for 160 days,we can see that it have favorable creep characteristic.There are two parts of rheology from the rock salt interlayer,one is the rock salt's creep,the other is the rock salt interlayer's creep.The creep rate of rock salt is bigger than rock salt interlayer,and the transverse creep rate is also bigger than rock salt interlayer.Based on the experimental result,we obtained the experience formula of rock salt interlayer by regressive analysis,and the paper determined its parameters.At the same time we set up the elastic and visco-elasto-plastic model and constitutive equation of rock salt interlayer by analyzing the features of the curve,and provided the thereunder to stability analysis of oil and gas storage caverns in rock salt.