摘要
准噶尔盆地南缘前陆冲断带构造演化与成藏过程复杂。为深化对这种复杂性的认识,以给区域油气勘探和基础石油地质研究提供参考信息,针对区域构造上存在东西分段、南北分带的特点,从不同角度详细分析了不同区段油气成藏的特征及其差异,包括烃源、储层、圈闭、输导、保存、成藏模式和主控因素。结果表明,不同区段的油气藏分布层位和成藏特征均不同,展示出油气成藏的差异性。其中,东段阜康断裂带主要是二叠系(包括侏罗系)的油气聚集于侏罗系储层中,成藏主控因素是圈闭、保存条件和储层;中段山前冲断带主要是侏罗系和二叠系(包括白垩系)的油气聚集于古近系和白垩系储层中,成藏主控因素是烃源岩、油源断裂和储层;西段四棵树凹陷地区主要是侏罗系(包括古近系)的油气聚集于古近系—新近系和白垩系储层中,油气成藏主控因素是运移通道和储层条件。
The tectonic evolution and hydrocarbon accumulation in the foreland fold-and-thrust belt of the southern Junggar Basin is complex. In order to reveal this complexity and in turn provide basic information for regional petroleum exploration and fundamental geological studies, this paper analyzes petroleum accumulation features. The study area is characterized by structurally different segments along the east-west direction, and by structurally different belts along the north-south direction. The hydrocarbon accumulation in these different areas was discussed from a variety of aspects, including sources, reservoirs, traps, conduits, preservation, hydrocarbon accumulation and controlling factors. A strong difference in hydrocarbon formation is shown by reservoir age and source-reservoir-cap type in different geotectonic units. In the eastern segment （i.e., the Fukang fault belt）, the Permian-sourced （including Jurassic-sourced） hydrocarbons were mainly accumulated in Jurassic reservoirs, and the hydrocarbon accumulation was predominantly controlled by traps, preservation and reservoirs; In the middle segment （i.e., the foreland fold-and-thrust belt）, the Jurassic-and Permian-sourced （including Cretaceous-sourced） hydrocarbons were mainly accumulated in Paleogene and Cretaceous reservoirs, and the hydrocarbon accumulation was predominantly controlled by source rocks, oil-source faults and reservoirs; In the western segment （i.e., the Sikeshu sag area）, the Jurassic-sourced （including Paleogene-sourced） hydrocarbons were mainly accumulated in Paleogene-Neogene and Cretaceous reservoirs, and the hydrocarbon accumulation was predominantly controlled by migration pathway and reservoirs.
出处
《高校地质学报》
CAS
CSCD
北大核心
2010年第3期339-350,共12页
Geological Journal of China Universities
基金
国家“十五”重大科技攻关项目(2004BA616A-04-09)资助
关键词
油气成藏
差异性
前陆冲断带
准噶尔盆地南缘
hydrocarbon accumulation
difference
foreland thrust-fold belt
southern Junggar Basin
