库车坳陷西段阿瓦特构造转换带盐构造演化特征及影响因素
Editorial Committee of Earth Science-Journal of China University of Geosciences(2023)
Abstract
为厘定库车坳陷西段盐岩沉积边界盐构造演化特征及影响因素,利用野外地质调查、工业地震剖面解析和三维沙箱物理模拟实验对阿瓦特构造带进行了综合分析.结果表明:(1)阿瓦特构造带是库车坳陷西段典型挤压构造转换带,由乌什凹陷至阿瓦特凹陷,形成了由叠瓦逆冲断层向盐相关褶皱过渡的构造转换特征;(2)塔拉克走滑断层发育于乌什凹陷和阿瓦特凹陷交界处,是一条发育于盐上覆层的滑脱形成调节性横断层.受该断层影响,在盐上覆地层中形成塔拉克向斜、塔拉克背斜等拖曳式盐相关构造.越靠近塔拉克走滑断层,褶皱拖曳揉皱作用越强,甚至容易发育褶皱相关断层,促使盐岩出露地表;(3)阿瓦特构造转换带新生代变形主要受区域挤压作用、盐层分布及基底断裂活动共同控制.
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Key words
Kuqa depression,Awate structural transfer zone,salt-related fold,Talake strike-slip fault,sand-box analogue modeling,structural geology
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