库车前陆盆地东秋里塔格区带盐相关构造特征

库车前陆盆地的东秋里塔格构造带新近系中广泛分布着厚层膏盐,典型地震剖面解释发现,盐上地层、盐层和盐下地层分别具有不同的构造样式和变形机理.分别进行的地质模型研究表明,盐上层构造地质模型主要有逆冲断层和断层传播褶皱、顶板反向逆冲断层、逆冲推覆体、盐上向斜等构造;盐层构造地质模型主要有盐枕构造、鱼尾构造、盐推覆构造等;盐下层构造地质模型主要有断层转折褶皱、背冲断块构造、Ⅰ型三角带构造、逆冲断块构造、逆冲断裂带等.盐上层、盐层和盐下层共同组成的构造样式有Ⅱ型三角带,具有明显的三位一体的构造特征.盐相关构造形成各种各样的盐相关构造圈闭,这些盐相关构造圈闭与阳霞凹陷烃源岩生气期相匹配,在盐下构造圈闭中形成大量的天然气藏.

Characteristics of salt-related tectonics in the eastern Q iulitage tectonic belt of Kuche foreland basin

The Neogene in the eastern Qiulitage tectonic belt of Kuche foreland basin developed thick salt layer. The explanation of seismic profiles showed that the strata above salt layer, salt layer and strata below salt layer had different structural style and deformation mechanism. The geological models of the strata above salt layer include the thrust fault and fault propagation fold, roof plate reversal thrust fault, thrust drapes and syncline above salt layer. The geological models of salt layer contain the salt pillow, fish tail and salt nappe. The geological models of the strata below salt layer have the fault bend fold, popup, typeI triangle belt and thrust fault. The structural type jointly formed by salt layer, strata above salt layer and strata below salt layer is the type Ⅱ triangle belt. Saltrelated tectonics formed many types of traps. The deformation stage of these traps matched the stage of gas generation and generated many gas reservoirs in the structural traps below salt layer.