东濮凹陷构造变形的物理模拟研究

发布时间：2018-03-09 05:18

本文选题：构造变形　切入点：物理模拟　出处：《地球学报》2017年03期 　论文类型：期刊论文

【摘要】：东濮凹陷是一个研究程度较高的含油气区,前人在构造变形研究方面多注重于伸展变形的几何学分析而忽略了形成机制中走滑分量的作用。本文在对区域地质背景和东濮凹陷构造特征分析基础上,设计平、剖面砂箱实验对该凹陷的构造变形进行伸展-走滑模拟研究。结果表明:(1)具走滑性质的断裂组合形成的构造样式更加复杂多样,走滑断层弯曲会产生挤压或伸展分量,在相邻的区域内形成局部的凹陷和隆起,主动盘的不同会形成不同的断裂组合;(2)在区域NNW—SSE向伸展变形下,形成了东濮凹陷两洼一凸的近对称格局,基底深断裂的张扭性开裂加速了凹陷的形成,主断层上、下盘均有明显的活动;(3)受基底断裂活动影响,大约Es~2-Ed沉积期凹陷存在一个明显的右旋走滑变形期,在凹陷的中部隆起带上出现了负花状、火焰状等典型走滑构造样式,走滑变形具有阵发性特点。
[Abstract]:Dongpu depression is an oil-bearing gas region with high degree of research. In the study of tectonic deformation, the former paid more attention to the geometric analysis of extensional deformation and neglected the role of strike-slip component in the formation mechanism. Based on the analysis of the regional geological background and the structural characteristics of Dongpu depression, the plane is designed in this paper. The structural deformation of the sag is simulated by extension-strike-slip simulation in section sand box experiment. The results show that the structural styles formed by the fault combination with strike-slip property are more complex and diverse, and the bending of the strike-slip fault will produce compressional or extensional components. Local sag and uplift are formed in adjacent regions and different fault assemblages are formed with different active plates) under regional NNW-SSE extensional deformation, a nearly symmetric pattern of two depressions and one convex in Dongpu sag is formed. The tensional and torsional cracking of the deep basement fault accelerates the formation of the sag. On the main fault, there is obvious activity on the lower side of the basement fault, which is influenced by the basement fault activity. There is an obvious dextral strike-slip deformation period in the sag during the Es~2-Ed sedimentary period. There are some typical strike-slip structural styles in the middle uplift of the sag, such as negative flower-like and flame-like, and the strike-slip deformation is paroxysmal.
【作者单位】：河北地质大学资源学院;中国石油大学(北京)地球科学学院;
【基金】：国家自然科学基金项目(编号:40372072) 河北省自然科学基金项目(编号:D2013403018) 河北省研究生示范课程建设项目(编号:KCJSX2017091)联合资助~~
【分类号】：P542;P618.13

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