渤海海域走滑双重构造发育特征及成因机制

发布时间：2018-01-20 19:05

本文关键词： 走滑双重构造成因机制展布规律油气成藏渤海海域　出处：《中国石油大学(华东)》2015年硕士论文　论文类型：学位论文

【摘要】：渤海海域新生代时期在地幔上涌、板块碰撞等多动力源的区域地质背景影响下发育有复杂的断裂系统,加之NNE向郯庐断裂带与NWW向张家口-蓬莱、秦皇岛-旅顺断裂带新生代发生强烈的走滑活动,走滑双重构造等派生构造十分发育,对其形成机制、展布规律的研究具有十分重要的意义,不仅能丰富构造地质学的理论体系,也能为人们研究和认识走滑背景下盆地内部结构特征及其成因机制提供一个新的思路和方法。本文运用渤海海域丰富的三维地震资料,综合运用相干切片识别法,地震剖面识别法,三维层面图识别法,断裂系统图识别法,对渤海海域四个区块发育的走滑双重构造进行了系统识别,并运用构造物理模拟对比,断层活动性分析,平衡剖面法等方法,对走滑双重构造的发育演化机制进行了讨论,确定了渤海海域走滑双重构造的时空展布规律与发育类型,并与具体的勘探实践相结合,探讨了走滑双重构造的石油地质意义。渤海海域走滑双重构造成因机制复杂,类型多样,侧接型走滑双重构造包括由辽中2号断裂与辽东断裂右旋左阶形成的辽东凸起北段,由辽中1号断裂与辽中2号断裂右旋右阶形成的辽中凹陷,由辽中1号分支断裂右旋右阶形成的金县1-1构造,由莱州东支分支断裂右旋侧接形成的垦利6-5构造,由郯庐断裂带渤南段右旋右阶形成的渤南走滑双重构造;平直带位置的走滑双重构造包括由郯庐断裂带反向走滑带形成的蓬莱9-3构造;弯曲位置的走滑双重构造包括由沙北一号走滑弯曲部位形成的沙北一号构造。渤海海域走滑双重构造的发育具有东多西少,新近纪多古近纪少,发育时间跨度大的特点,不同规模,不同走向,不同成熟度的走滑双重构造特征各异。从渤海海域走滑双重构造的研究中可以得到5点启示:(1)侧接型走滑双重构造易于发育;(2)拉张走滑双重构造易于发育;(3)次级断裂可以诱导主边界断裂发育形成走滑双重构造;(4)主边界断裂间距与走滑距离的比值对内部构造发育有重要影响;(5)次级断裂并非里德尔R剪切。另外,挤压走滑双重构造具有释压区断裂油气垂向输导性好,增压区断裂侧向封堵性强的特点,拉张走滑双重构造易于形成持续沉降深洼的特点,这些特征对油气聚集成藏十分有利。
[Abstract]:Under the influence of the regional geological background of multiple power sources such as mantle upwelling, plate collision and so on, complex fault systems developed in the Bohai Sea during the Cenozoic period, in addition to the NNE to Tanlu fault zone and NWW to Zhangjiakou-Penglai. The Cenozoic strong strike-slip activities occurred in Qinhuangdao-Lushun fault zone, and the derived structures such as strike-slip double structures are well developed. It is of great significance to study the formation mechanism and distribution law of these structures. It can not only enrich the theoretical system of tectonic geology. It can also provide a new way of thinking and method for people to study and understand the internal structural characteristics and genetic mechanism of the basin under the background of strike-slip. This paper uses abundant three-dimensional seismic data in the Bohai Sea. By means of coherent slice recognition, seismic profile recognition, 3D stratigraphic recognition and fault system map recognition, the strike-slip dual structures developed in four blocks in Bohai Sea are systematically identified. The development and evolution mechanism of strike-slip dual structure is discussed by means of structural physical simulation correlation fault activity analysis and equilibrium profile method. The temporal and spatial distribution and development types of the strike-slip double structures in the Bohai Sea area are determined and combined with the specific exploration practice. The petroleum geological significance of strike-slip double structure is discussed. The formation mechanism of strike-slip double tectonics in Bohai Sea is complicated and the types are various. The lateral strike-slip double structure consists of the northern segment of Liaodong uplift formed by Liaozhong No. 2 fault and Liaodong fault right-handed left step, and the Liaozhong sag formed by right right step of Liaozhong No. 1 fault and Liaozhong No. 2 fault. The Jinxian 1-1 structure formed from the right-handed right step of Liaozhong No. 1 branch fault and the Kenli 6-5 structure formed by the right-lateral junction of the eastern branch fault of Laizhou. The Bonan strike-slip double structure formed from the right right step of the Bonan south segment of the Tanlu fault zone; The strike-slip double tectonics in the position of the flat straight zone include the Penglai 9-3 structure formed by the reverse strike-slip zone of the Tanlu fault zone. The strike-slip double structure in the bending position includes the Shabei No. 1 structure formed by the bend part of Shabei No. 1 strike slip. The development of the strike-slip double structure in Bohai Sea area has the characteristics of the east and the west, and the Neogene is less than that of the Paleogene. Development time span of the characteristics of large, different scales, different trends. The characteristics of strike-slip double tectonics in different maturity are different. From the study of strike-slip double tectonics in Bohai Sea area, we can get 5 inspirations: 1) the lateral strike-slip double structure is easy to develop; 2) the extensional strike-slip double structure is easy to develop; (3) the secondary faults can induce the development of the main boundary faults to form strike-slip double structures. (4) the ratio of the distance between main boundary faults and strike-slip distance has an important effect on the development of internal structures. In addition, the compression-strike-slip dual structure is characterized by good vertical oil and gas transport and strong lateral sealing in the pressurized zone. The extensional strike-slip double structure is easy to form the characteristics of continuous subsidence and deep depression, which is beneficial to the accumulation of oil and gas.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P736.1

【相似文献】