东濮凹陷构造变形的物理模拟研究*
投稿时间:2016-03-20  最后修改时间:2016-04-28  点此下载全文
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作者单位E-mail
马宝军 河北地质大学资源学院 bjma_009@163.com 
漆家福) 中国石油大学北京地球科学学院  
基金项目:国家自然科学基金项目(面上项目,编号40372072),河北省自然基金(编号D2013403018)
中文摘要: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Es2-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。
中文关键词:构造变形  物理模拟  沙箱实验  基底走滑断裂  东濮凹陷
 
An analysis on physical modeling of tectonic deformation in Dongpu sag
Abstract:The Dongpu sag is a petroliferous area with higher research degree. The previous research has focused on the geometry analysis of extensional deformation, but ignored the relationship between strike slip deformation and sag. In order to analyze the tectonic deformation in Dongpu sag, it has been researched on the typical plane and profile sandbox experiments, combined with the regional geological features. The paper shows that: (1) the tectonic style of strike slip faults were very complex, and bending of strike slip faults could bring compression or extension component, which caused partial extrusion uplift or slip extensional sag in the adjacent area. (2) In the regional NNW-SSE trending extensional deformation, it formed the Dongpu sag with the nearly symmetrical pattern of two depression and one uplift. The activity of tenso-shear fault in deep basement accelerated the formation of the sag and the main faults in the hanging wall and footwall had both obvious activity traces. (3) Due to the effect of basal fault, there was an obvious right-lateral strike-slip deformation stage in about Es2-Ed sedimentary period. The typical strike slip tectonic styles, such as the flower structure, the flame structure in the central uplift belt of sag could be caused by the deformation of the basement strike slip fault with paroxysmal characteristics.
keywords:tectonic deformation  physical modeling  sandbox experiment  basement strike-slip fault  Dongpu sag
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