塔里木盆地西南坳陷构造样式与圈闭发育特征

STRUCTURAL STYLES AND THE TRAP DEVELOPMENT CHARACTERISTIC IN THE SOUTHWEST DEPRESSION OF TARIM BASIN

在详细分析地面地质资料和大量高质量地震剖面的基础上，将塔里木盆地西南坳陷构造样式分为基底卷入型和盖层滑脱型2大类，前者可分为基底逆冲、扭动、逆冲与走滑扭动叠加等3亚类，后者可分为叠瓦式逆冲、滑脱背斜、断弯背斜及披覆与滑脱挤压背斜叠加构造等4亚类。大多数基底卷入构造发生于海西期，喜山期再次强烈活动；大多数盖层滑脱构造发生于喜山期。构造多期活动，因此部分构造样式为叠加构造。不同的构造样式具有不同的圈闭发育特征。依据构造样式和圈闭特征，将塔西南坳陷的圈闭划分为构造圈闭和非构造圈闭2大类。

The structural styles in the Southwest Depression are classified into basement-involved structures and detached structures. The former are divided into three types: basement-involved thrust structure, wrench structure, superposed thrust and wrench structures. The latter are divided into four types: imbricated thrust structure, detached anticline, superposed drape anticline and detached anticline, fault-bend anticline. Most of basement involved structures were developed during Hercyni-an cycle and deformed strongly during Himalayan cycle. Most of detached structures were developed during Himalayan cycle. There were multi-stages of tectonics in the area, thus some structures are superposed. The characteristic of trap developments vary from one style to another. Based on the structural style and trap characteristic, traps in the depression are classified as structural and non-structural traps.