二连盆地赛汉塔拉凹陷伸展构造特征及其控藏作用  

Extensional Tectonic Feature and Its Control on Hydrocarbon Accumulation of Saihantala Sag in Erlian Basin

作　　者：屈晓艳[1] 杨明慧[1,2] 罗晓华[1] 丁超[1] 周多[1] 龚婷[1] 杨光[1] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249

出　　处：《现代地质》2013年第5期1023-1032,共10页Geoscience

基　　金：国家自然科学基金项目(41172127);中国石油华北油田分公司项目(HBYT-WTY-2011-JS-327)

摘　　要：通过地震剖面解释,分析二连盆地赛汉塔拉凹陷的构造特征及其控藏作用。研究表明:赛汉塔拉凹陷断裂十分发育,不同级别的断裂构成了复杂的断裂系统。断裂可划分为4个级别,其中一级断层控制赛汉塔拉凹陷的构造格局,二级断层控制二级构造带,三级断层控制局部构造,四级断层强化局部构造的变形。断裂的活动期次可划分为5期:侏罗系断陷期、阿尔善组初始断陷期、腾一段强烈断陷期、腾二段断拗转换期和赛汉组断陷萎缩期。赛汉塔拉凹陷总体呈现"东西分带、南北分块"的构造格局,内部发育5个一级构造单元、4个二级构造带和多种多样的局部构造。断层控制生储盖的发育及其配置关系,并提供油气聚集空间。长期活动的断裂是赛汉塔拉凹陷主要的油源断层。受构造带控制,赛汉塔拉凹陷油气主要聚集在中央断裂带和东部洼槽带。Based on the seismic profile interpretation, the tectonic feature of Saihantala Sag in Erlian Basin and its control on reservoir-forming were researched. It was concluded that there were different levels of faults which constituted the fault system in Saihantala Sag. The faults can be classified into four classes： the first-class faults controlled the tectonic pattern; the second-class faults controlled the secondary structural belt; the third-class faults controlled the local structure; the fourth-class faults complicated the local structure. The fault active sta-ges can be divided into five stages as follows, the fault-depression period in Jurassic, the initial fault-depression period in Aershan Formation, the strong fault-depression period in Tengger Formation, the fault-depressed di-versionary period in Tengger Formation and the ending of fault-depression period in Saihantala Formation. The Saihantala Sag exhibited a east-west belted and south-north partitioned pattern, and developed five first-order tectonic units, four secondary structural belts and various types of local structures. The fault activity controlled the source-reservoir-cap assemblage and its development, and the fault provided oil and gas accumulation space. The long-term active faults were major transporting hydrocarbon fault types in Saihantala Sag. Controlled by structural belts, the oil of Saihantala Sag has accumulated mainly in the central fault zone and the eastern de-pression zone.

关 键 词：断裂 构造格局 控藏 赛汉塔拉凹陷 二连盆地 

分 类 号：TE121.2[石油与天然气工程—油气勘探]