摘要
受南天山造山作用的影响,塔里木盆地库车坳陷乌什凹陷断裂构造样式复杂,为了查明其基础构造特征,结合区域地质资料、地震资料解释等,综合分析该凹陷构造样式。研究表明,乌什凹陷发育对冲、背冲、楔冲3种主要断层构造组合形式,以及断弯褶皱、断展褶皱、双重构造、突发构造、生长构造等一系列局部构造变形样式。在断裂构造样式分析的基础上,将研究区划分出北东、北东东、北西、东西向4组逆断层以及北北西向的走滑断裂。根据研究区构造演化背景,结合地震剖面和平衡演化剖面分析,认为研究区主体断层至少经历了前中生代、二叠纪末—三叠纪初、侏罗纪、侏罗纪末—白垩纪初和新近纪晚期5个演化阶段。乌什凹陷特殊构造样式与烃源岩、油气藏和含油气系统的性质及分布有着密切的关系。
Affected by the South Tianshan orogenesis, the faulted structure patterns in the Wushi Sag are very complex. Aimed to find out the basic characteristics of the structures, this article studies many seismic profile sections, the regional geology, the structural patterns and the formative stage of the structures. The Wushi Sag has three main fault patterns （face to face thrust, back to back thrust, sphenoid thrust）, and many local fault structural patterns （fault-bend fold, fault-propagation fold, duplex structure, outburst structure, growth structure, etc）. There mainly develops four groups of reverse faults （NE, NEE, NW, EW） and one group of NNW trending strike-slip faults. According to the structural background, seismic profiles and balanced cross sections, the main fault in the studied area experienced at least five evolving stages which are pre-Mesozoic, late Permian--early Tertiary, Jurassic, late Jurassic--early Cretaceous, and late Neogene. The structural styles have close relation.ship with source rocks, hydrocarbon reservoirs, and the character and distribution of petroleum systems.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2008年第4期444-451,共8页
Petroleum Exploration and Development
基金
国家重点基础研究发展规划973项目(2001CB209104-04)
国家自然科学基金项目(40074014)
关键词
乌什凹陷
断裂构造样式
构造形成期
平衡演化剖面
Wushi Sag
faulted structural pattern
structure formative stage
balanced cross section
作者简介
郑民（1979-），男，山东潍坊人，现为中国科学院地质与地球物理研究所兰州油气资源中心博士研究生，主要从事含油气盆地构造分析、石油地质等研究工作。地址：甘肃省兰州市东岗西路382号，中国科学院兰州地质研究所，邮政编码：730000。E—mail：zhengmincas@yahoo．com．cn
