阿姆河右岸东部山前地质结构与油气聚集

发布时间：2018-04-29 23:30

本文选题：断层相关褶皱 + 分层变形　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：阿姆河右岸东部山前位于土库曼斯坦阿姆河盆地阿姆河北侧与土-乌国境线内侧的中石油阿姆河右岸区块东南部。研究区邻近西南吉萨尔山脉,区内大型构造发育,并已发现阿盖雷、阿克古莫拉姆两个气田,故研究其地质结构和油气聚集特征,既有利于油气勘探的深入又可为盆山耦合研究提供实例,具重要的油气勘探和科学理论意义。本文旨在以探井分层、测录井、2D/3D地震资料为基础,以断层相关褶皱理论和构造复原理论为指导,分析不整合面特征,划分构造-地层层序,研究构造几何学和运动学样式和断裂系统特征,进行构造复原并对构造成因机制进行分析。最终在地质结构研究的基础上重新划分研究区构造单元并剖析地质结构对油气聚集的控制作用。论文主要取得一下认识:(1)研究区具“上下分层、东西分带、南北分区”的地质结构特征。纵向上分为基底构造楔、盐下变形层、盐间变形层和盐上变形层;平面上由东向西分为东部单斜带、中部背斜带和西部凹陷带;南北方向由乌兹恩库杜克走滑断裂分为两个区,其中北部构造变形较剧烈。以膏盐岩为界,研究区断裂分为盐上断裂系统和盐下断裂系统;盐上断裂以正断层和走滑断层为主,呈NWW-SEE向;盐下断裂以逆断层为主,呈NW-SE向,控制了盐下洼隆相间的构造格局。(2)根据平衡复原,将研究区构造变形划分为二叠纪-三叠纪过渡基底形成阶段;早中侏罗世断陷阶段;晚侏罗世-古近纪坳陷阶段;新近纪-第四纪挤压抬升阶段。新近纪以来研究区构造变形受印度-欧亚碰撞、阿拉伯-欧亚碰撞、哈萨克板块东移等多方向构造应力作用,褶皱波长发生干涉叠加,加之膏盐层调节作用和盐上、盐下岩性的差异,形成了盐上层宽缓、盐下层陡窄的构造特征。(3)研究区侏罗系生储盖组合配置良好,油气生成高峰和圈闭形成时空匹配,是区域油气富集的根本因素。油气纵向上沿沟通油源的逆冲断裂运移,平面上发生差异聚集。结合研究区的地质结构、构造演化和石油地质特征,认为西部凹陷带内低凸起和中部背斜带系列圈闭为油气勘探有利方向。
[Abstract]:The east front of the right bank of the Amu River lies in the southeast of the right bank of CNPC in the north side of the Amu River and the inner side of the Turkish-Ukrainian border line. The study area is adjacent to the southwestern Gisar Mountains, where large structures have developed, and two gas fields, Agere and Akgumorram, have been discovered. Therefore, the geological structure and oil and gas accumulation characteristics have been studied. It is not only beneficial to the exploration of oil and gas, but also provides an example for the study of basin-mountain coupling, which is of great significance in oil and gas exploration and scientific theory. The purpose of this paper is to analyze the characteristics of unconformities and divide the tectonic-stratigraphic sequence on the basis of exploration well stratification and logging 2D / 3D seismic data, guided by fault-related fold theory and structural restoration theory. Structural geometry and kinematic patterns and fault system characteristics are studied, structural restoration and structural genetic mechanism are analyzed. Finally, on the basis of the study of geological structure, the tectonic units in the study area are redivided and the controlling effect of geological structure on oil and gas accumulation is analyzed. The study area is characterized by "upper and lower stratification, east-west zonation, north-south zoning". Vertically, it is divided into basement structural wedge, subsalt deformation layer, intersalt deformation layer and upper salt deformation layer; the plane is divided from east to west into the eastern monocline zone, the central anticlinal zone and the western depression zone, and the north and south direction is divided into two areas from the Wuzenkuduk strike-slip fault. Among them, the northern tectonic deformation is more severe. The faults in the study area are divided into upper salt fault system and subsalt fault system, the upper salt fault is dominated by normal fault and strike-slip fault with NWW-SEE orientation, and the subsalt fault is dominated by reverse fault with NW-SE direction. According to the balance restoration, the tectonic deformation of the study area is divided into Permian-Triassic transitional basement formation stage, early and middle Jurassic fault depression stage, late Jurassic-Paleogene depression stage, and late Jurassic-Paleogene depression stage. Neogene-Quaternary compression uplift stage. Since the Neogene, the tectonic deformation in the study area has been subjected to multi-directional tectonic stresses, such as the India-Eurasian collision, the Arab-Eurasian collision, the eastward shift of the Kazakh plate, and the interference superposition of fold wavelengths, as well as the adjustment of the gypsum salt layer and the salt. The difference of subsalt lithology resulted in the structural characteristics of the salt upper layer being slow and the lower salt being steep and narrow.) the Jurassic reservoirs and caprock assemblages in the study area are well configured, the peak of hydrocarbon generation and the space-time matching of trap formation are the fundamental factors for regional oil and gas enrichment. The oil and gas migrates along the thrust fault which communicates the oil source longitudinally, and the differential accumulation occurs on the plane. Combined with the geological structure, structural evolution and petroleum geological characteristics of the study area, it is considered that the low uplift in the western sag and the series traps in the middle anticline zone are the favorable directions for oil and gas exploration.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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