摘要
根据扭动构造理论,结合物理模拟实验方法,综合运用野外露头勘测和高精度三维地震资料解释,在简单剪切模式指导下,对准噶尔盆地西北缘大侏罗沟断层特征、形成机制及控藏作用进行研究。结果表明:大侏罗沟断层为右旋平移断层,属达尔布特大型走滑断层的派生构造,并依据地层分布关系及流体包裹体信息,判断该断层形成于印支期,在燕山期有强烈活动;大侏罗沟断层形成于压扭环境,沿Sylvester简单剪切模式中的R'剪裂面发育,并派生出次级断层,构成走滑断裂体系;大侏罗沟断裂带岩石碎裂严重,糜棱化和片理化明显,主走滑带及其分支断层封闭能力均较强,形成了多个有效的断块圈闭,显示扭动构造对西北缘油气成藏具有明显的控制作用。
Using the shear structural theory and physical simulation experiments,this study focuses on the strike-slip characteristics,forming mechanisms and controlling reservoirs of Dazhuluogou fault in the northwestern margin of Junggar Basin.Comprehensive analyses of the field outcrops are combined with high precision 3D seismic data in the framework of simple shear model. The results show that the Dazhuluogou fault which was formed in a twist-compression environment is a dextral strike-slip fault,which belongs to the derived structure of Daerbute fault. It is suggested from the stratigraphic distribution relationship and fluid inclusion information that the Dazhuluogou fault was initialized during the Indosinian movement and was active in the Yanshan movement. The development of the fault was along the R’ shearing plane in the simple shear model of Sylvester,where secondary structures were evolved before the strike-slip fault system was formed. Rocks in the Dazhuluogou fault zone were severely ruptured and broken,and some evolved into mylonites and schists. The closure in the main and secondary faults in strike-slip fault system is strong,resulting in the forming of a series of faulted block traps. The shear structures which developed in the northwestern margin of Junggar Basin are relevant to the oil and gas accumulation obviously.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第5期41-47,共7页
Journal of China University of Petroleum(Edition of Natural Science)
基金
国家'973'计划项目(2014CB239005)
国家自然科学基金项目(41272142)
国家科技重大专项(2011ZX05001)
山东省自然科学基金项目(ZR2012DM011)
关键词
大侏罗沟断层
走滑构造
形成机制
控藏作用
准噶尔盆地
Dazhuluogou fault
strike-slip structure
forming mechanism
controlling reservoirs
northwestern margin
