库车坳陷秋立塔克盐构造形成过程物理模拟

通过采集新生界岩石样品、盐岩样品并测定样品的岩石力学参数 ,经过理论计算和实验 ,根据相似性原理 ,选择凡士林和松散的细沙为实验材料 .采用砂箱挤压模型 ,对库车坳陷西段秋立塔克盐构造形成过程进行模拟 .实验表明 :1在挤压构造背景下、边界条件合适可以形成库车坳陷西段秋立塔克盐枕构造 .2实验中 ,随着挤压量的不断增大 ,盐枕上覆地层逆冲变形强烈 ,局部地层甚至卷入盐层之中 ,而下伏地层的变形强度较弱 .盐岩本身的变形具有明显的塑性变形特征 ,与上下岩层的脆性变形明显不同 .3随着变形的逐渐加强 ,局部的逆冲断层在挤压背景下可发生反转 ,形成正断层构造 .

Physical Modeling of the Evolution of Qiulitake Salt Structure in Kuche Depression

The parameters of rock and salt samples in Kuche depression of Tarim Basin are measured. According to similarity theory, vaseline and fine sand are selected as experimental materials in conducting bilateral compressional modeling experiments on the evolution of salt structure in Kuche depression in Tarim Basin. The experimental results show that Qiulitake salt structure can be formed under certain proper border conditions and compressional settings. With the processing of compressional deformation, the overburden beds deformed much more greatly than the underlying beds. The plastic deformation of the salt bed is quite different from the brittle deformation of the overburden and underlying rocks. In the late stage of the deformation process, some thrusts inverted into normal faults although the regional stress was still compressional.