大庆长垣北部中浅层断裂系统演化及成因机制研究

发布时间：2018-07-29 07:02

【摘要】：本文从研究区整体构造格局出发,对长垣北部不同构造带断裂几何学特征进行对比分析,对研究区构造单元进行了划分,并对不同构造单元断裂发育特征进行了较详细的对比分析。在明确研究区整体构造格局的基础上,利用断层断距-埋深曲线和断层面断距等值线图,结合连井小层精细对比和生长指数剖面,对大庆长垣北部断裂的形成演化过程进行了厘定,并划分断裂系统。最后,结合区域应力场背景和不同断裂系统发育特征,对研究区构造及断裂的成因机制进行了分析探讨,并以萨尔图断褶反转背斜为重点研究对象,设计物理模拟实验,模拟了I型和V型断裂以及断褶反转背斜的形成过程。据研究区断裂几何学和运动学特征,将断裂划分为5套断裂系统:I型断裂:NEE走向断裂,断穿层位为T11-T06或T11,为嫩末-明末-古近系末反转期活动断裂;II型断裂:NNW-NWW走向断裂,断穿层位为T11,为姚家-嫩一二段活动断裂;III型断裂:NNW-NWW走向断裂,断穿层位为T11-T06,为姚家-嫩一二段—反转期活动断裂;IV型断裂:NW-NNW走向断裂,断穿层位为T2-T06,为青山口组—姚家-嫩一二段—反转期活动断裂,为垂向分段生长断层;V型断裂:NNE走向断裂,断穿层位为T5-T06,为断陷期、反转期活动断裂。研究区正反转断层及断褶反转背斜的形成受控于基底坡坪式断层的反转模式。断褶反转背斜为基底坡坪式断层的先存中央隆起构造在反转过程中进一步变形形成的背斜构造。正反转断层在断陷期受NWW向拉张应力场控制形成,受基底坡坪式断层的影响,在反转期发生反转形成正反转断层。IV型断裂为青山口组沉积时期受WE向拉张应力场作用形成,反转期受左旋压扭应力场改造成为NW-NNW向。II、III型断裂受控于反转期左旋压扭应力场的NEE-SWW向伸张分量控制形成。I型断裂为反转期受控于反转背斜顶部局部拉张应力场控制形成的断裂,其走向受控于反转期NNW向挤压应力分量。
[Abstract]:Starting from the whole tectonic pattern of the study area, this paper makes a comparative analysis of the geometrical characteristics of the faults in different structural zones in the northern part of the Placanticline, and divides the tectonic units in the study area. The characteristics of fault development in different tectonic units are compared and analyzed in detail. On the basis of defining the whole structural pattern of the study area, using the fault fault-buried depth curve and the fault plane fault interval isoline map, combining with the fine correlation and growth index profile, The process of formation and evolution of the faults in the northern part of Daqing Placanticline is determined and the fault system is divided. Finally, based on the background of regional stress field and the development characteristics of different fault systems, the structure and the formation mechanism of faults in the study area are analyzed and discussed, and the physical simulation experiment is designed with Saltu fault fold inversion anticline as the focus. The formation process of type I and V mode faults and the fold inversion anticline are simulated. According to the geometric and kinematic characteristics of the faults in the study area, the faults are divided into five sets of fault system: 1: I mode 1 fault strike fault, the fault transgression horizon is T11-T06 or T11, and the fault is a type II fault pattern fault of NNW-NWW strike in the late Nen-late Ming and the late Paleogene period. The fault bed is T11, which is the active fault of Yao Jia-Nen 1 and 2 member. The fault zone is T11-T06, and the fault zone is T11-T06. it is a type IV fault pattern fault of Yaojia-Nen 1 and 2 member, and the strike fault of type IV NW-NW NW. The fault horizon is T2-T06, which is the active fault of Qingshankou formation-Yao Jia-Nen 1-2 member-inversion period, and the V-type fault is the strike fault of NNE, and the fault layer is T5-T06, which is the faulting period and the reverse active fault. The formation of positive and reverse faults and fold inversion anticlines in the study area is controlled by the inversion model of the basement slope flat faults. The fault fold inversion anticline is the anticline structure formed by the further deformation of the central uplift structure of the basement slope flat fault in the process of inversion. The positive and negative turn fault is formed by the NWW tensile stress field during the faulting period, and by the slope flat fault of the basement. The positive and negative turn fault .IV fault is formed during the deposition period of the Qingshankou formation under the action of the we tensile stress field during the inversion period, and the positive and negative turn fault is formed during the deposition period of the Qingshankou formation by the tensile stress field of the we direction. The inversion period was transformed by the left spin torsional stress field into a NW-NNW oriented. III-III fracture controlled by the NEE-SWW direction extension component of the reverse period left spin stress field. The type I fracture was formed by the inversion period controlled by the local tension stress field at the top of the reverse anticline, and the inversion period was controlled by the local tensile stress field at the top of the reverse anticline. Its strike is controlled by the NNW extrusion stress component in the reverse period.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P542

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