摘要:吐木休克断裂是塔里木盆地西部的一条大型基底卷入断裂，构成塔里木盆地次级构造单元阿瓦提凹陷和巴楚隆起的边界，由于断裂附近大量地层的缺失，难以确定断裂活动时间。通过对吐木休克断裂带典型地震剖面的系统解释，根据剖面特征，将其自西向东划分为5段，结合区域构造背景、沉积地层展布特征及其接触关系，重新厘定了吐木休克断裂的活动期次。结果表明吐木休克断裂具有多期活动特征，晚加里东期已开始逆冲活动，早侏罗世—早白垩世时期发生大规模冲断活动，巴楚隆起北缘构造在此时已形成雏形，喜山期为继承性冲断活动并最终定型。在此基础上建立了巴楚北缘油气成藏演化模式，认为吐木休克断裂上盘第一排构造带的碳酸盐岩圈闭及断裂下盘碎屑岩断鼻圈闭是下步有利勘探区带，关键是加强油气保存条件评价，巴楚北缘仍具有较好油气勘探前景。
关键词: 巴楚隆起北缘/
吐木休克断裂/
活动期次/
油气成藏
Abstract:The Tumuxiuke fault belt, which locates in the western Tarim Basin, is a large-scale basement-involved fault zone and forms the boundary between the Awati Sag and Bachu uplift （sub-tectonic units of Tarim Basin）. Since a mass of strata in the hanging wall of fault is missing, it is very hard to determine the active period of fault. Systematic interpretation of seismic profiles across the Tumuxiuke fault reveals that this fault can be divided into five sections according to tectonic features. Combine with the regional structural settings, distribution features of strata and stratigraphic contact relationship, active stages of the Tumuxiuke fault are redetermined. The results show that the Tumuxiuke fault is characterized by multi-stage activities. The thrust activities were begun in Late Caledonian and the massive thrusting movements were occurred during the Early Jurassic to Early Cretaceous, during which the structural rudiment in the northern margin of Bachu uplift was formed and finally stabilized in the late of Himalayan Movement. Ulteriorly, tectonic evolution and hydrocarbon accumulation model in the area of Bachu uplift and Awati Sag are established. Carbonate traps in the first-row structure belt of hanging wall and faulted nose-shaped traps within Silurian in the heading wall of Tumuxiuke fault are the favorable exploration regions, which can accept filling of natural gas that generated in the Himalayan period. Evaluation of preservation conditions are the key to exploration and there have bright prospects for the exploration of natural gas in the northern margin of Bachu uplift.
Key words:North rim of Bachu uplift/
Tumuxiuke fault/
Active period/
Hydrocarbon accumulation
PDF全文下载地址:
http://www.dzkx.org/data/article/export-pdf?id=geology_11601
