库车坳陷西段第三系盐上层基底沉降分析

根据地震层速度资料与地层砂泥岩含量的关系,求得新生界各层砂泥岩含量,结合经验的和实测的其它必要参数,计算了库车坳陷西段第三系盐上层的总沉降和构造沉降.根据变化趋势,可将沉降曲线划分为两种类型:上凸型和下凹型,北单斜带为下凹型,其余构造带为上凸型,沉降曲线不同阶段沉降速度的变化充分反映了天山造山带与库车坳陷的盆山耦合作用.根据总沉降和构造沉降曲线的关系,上凸型沉降曲线又可进一步划分为两个亚类,第一亚类为构造沉降曲线与总沉降曲线协调变化;第二亚类为两者不协调变化,反映盐的流动特点,这种现象在克拉苏构造带的南亚带最明显.

Analysis of the Basement Subsidence of the Cenozoic Overburden of the Western Kuqa Depression

Based on the sandstone and mudstone percentage obtained from the relationship of interval seismic velocity to these and other parameters required, the total subsidence and tectonic subsidence were computed to the basement of the overburden. The subsiding curves could be categorized as two types, concave and convex, based on their shape. The former is the characteristics of the subsiding curves of the depression near the North Monocline, and the later the other tectonic belts of the Kuqa depression. Subsiding velocity changes of different evolutionary stages show the coupling between the Kuqa depression and the Tianshan mountain. Based on the relationship between the total and tectonic subsiding curves, the convex subsiding curves can be further divided into two secondary types: harmonious and disharmonious. The later shows salt flow, which happened along the south limb of Kelasu tectonic belt.