摘要
以吐哈盆地区域构造应力场分析和以轴面成图与构造趋势分析为基础的吐鲁番坳陷3维空间构造演化模拟为出发点,认为吐鲁番坳陷侏罗系发育3排弧形构造带组成的巨型弧形构造体系,提出吐鲁番富油气坳陷发育逆掩断裂带下盘油气勘探新领域.逆掩断裂带下盘油气勘探领域有利成藏条件主要表现在:发育构造、岩性2大类和背斜、断鼻、断块、顺物源岩性和反物源岩性5种类型圈闭,构造类圈闭主要形成于侏罗系末期,岩性类圈闭主要依附于古构造背景发育,剩余圈闭面积大且成群成带分布,整体勘探程度较低,勘探潜力较大;紧邻3大主力生烃凹陷(胜北、丘东和小草湖),油源条件优越;发育中侏罗统区域和中下侏罗统局部2套盖层,逆掩断裂带下盘上倾方向断裂封堵条件好,后期保存条件优越,有利于较低部位的油气聚集成藏;整体构造体系与圈闭主要形成于侏罗系末期到白垩系早期,与侏罗系末白垩系的油气生成、运移与聚集期匹配良好,是吐哈盆地侏罗系进一步勘探的主要领域.
Based on the regional stress field analysis and the technique of structural trend analysis by axial surface mapping to model the spatial structural evolution of Turpan Depression, it was concluded here that a huge arc-shape structure system consisted mainly of 3 local arc-shape structure belts is buried in east-west direction in the Jurassic sedimentary covering of Turpan Depression. With this new opinion about the structural setting of Turpan Depression, a potential exploration domain of the footwall of the thrust fault system occurs. The accumulation conditions of the footwall focus mainly on the following aspects： the structural and lithological traps, which include the anticline, fault-nose and fault-block of structure type, and the source and inverse-source lithological trap. The structural trap was mainly generated in the later Jurassic period and the lithological trap is mainly attached to the ancient uplift. The remaining traps are large in area and distributed in group, and the overall exploration degree is lower and the exploration potential is large. The footwall is close to the 3 hydrocarbon-rich sags （Shengbei, Qiudong and Xiaocaohu Sag） and is good in hydrocarbon accumulation. 2 sets of seal rocks, i.e. the regional middle Jurassic and the local middle to lower Jurassic, exist. The up-dip fault of the footwall is in a good seal condition and is favorable for the hydrocarbon accumulation within the lower part. The traps were generated mainly in later Jurassic to early Cretaceous and they match the hydrocarbon generation, migration and accumulation in later Jurassic to early Cretaceous. So the footwall domain of the thrust fault system is the main exploration area for further exploration within Turpan Depression.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第6期795-801,共7页
Journal of Lanzhou University(Natural Sciences)
基金
中国石油天然气股份有限公司勘探与生产分公司科技项目(2012-04-02)
关键词
逆掩断裂带下盘
油气成藏条件
侏罗系
吐鲁番坳陷
吐哈盆地
footwall of thrust fault system
hydrocarbon accumulation condition
Jurassic
Turpan Depression
Turpan-Kumul Basin
