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Influence of fault geometry, kinematics and growth rate on syn-tectonic stratigraphic pattern: Insights from the 2D move-on-fault technique in MOVE software
Journal of Structural Geology ( IF 2.6 ) Pub Date : 2021-06-02 , DOI: 10.1016/j.jsg.2021.104377
Chao Deng , Rixiang Zhu , Jianhui Han , Kefeng Hou , Yu Shu , Chiyang Liu , Yuxiang Wu , Wei Long

Rift-related normal faults generally have various geometries, and cause the syn-rift stratigraphy in their hanging wall to be characterized by different infilling patterns. Our understanding of the tectonic control on the syn-rift stratigraphy mainly stems from the analysis of fault kinematics, stratigraphic styles and depositional facies. However, questions remain about how fault geometry, kinematics and slip rate influence the style of a rift-related half-graben and the syn-rift stratigraphy, and what enlightenment that relationship has for the hydrocarbon exploration in rifts. Using the 2D MOVE Software, this study attempts to simulate the development of a fault-bounded half-graben, with the aim of investigating the aforementioned questions. The modeling results show that, a planar, listric and ramp-flat-ramp border fault controls a tabular, wedged-shaped, and composite wedge-shaped growth package, respectively, but exceptionally, the planar fault bounds a wedge-shaped package if the fault rotates with movement. In addition, rollover structure forms when the border fault has a listric or ramp-flat-ramp shape, indicating that the fault geometry and kinematics dominate the syn-tectonic stratigraphic pattern. Besides, fault slip rate relative to sediment supply affects the scale, dip and infilling pattern of the syn-tectonic stratigraphy. In details, reduction of fault slip rate or increment of sediment supply results in: i) the extent of the syn-tectonic stratigraphy enlarging, ii) the dip angle of the syn-tectonic stratigraphy decreasing, and iii) the water depth in the related half-graben getting shallower. This study provides insights into understanding the origin of the variable styles of rift-related half-graben and syn-rift stratigraphy. Also, our modeling results have an important implication for evaluating source rock quality in rifts. Finally, we give a preliminary example of using the MOVE Software to investigate the geometry and evolution of fault-bounded basin, which is well worth being further explored.



中文翻译:

断层几何、运动学和增长率对同构造地层格局的影响:从 MOVE 软件中的二维移动断层技术获得的见解

与裂谷相关的正断层一般具有不同的几何形状,导致其上盘的同裂谷地层具有不同的充填方式。我们对同裂谷地层构造控制的认识主要来源于断层运动学、地层样式和沉积相的分析。然而,断层几何、运动学和滑动速率如何影响与裂谷相关的半地堑和同裂谷地层的类型,以及这种关系对裂谷油气勘探有何启示仍存在疑问。使用 2D MOVE 软件,本研究尝试模拟断层边界半地堑的发展,目的是调查上述问题。建模结果表明,平面、列表和斜坡-平坦-斜坡边界断层控制一个表格,楔形和复合楔形生长包,但例外的是,如果断层随着运动旋转,平面断层会包围楔形包。此外,当边界断层呈斜状或斜坡-平坦-斜坡形状时,会形成翻转结构,表明断层几何和运动学在同构造地层模式中占主导地位。此外,断层滑动速率相对于沉积物供应影响同构造地层的规模、倾角和充填模式。具体而言,断层滑动速率的降低或沉积物供应的增加导致:i)同构造地层的范围扩大,ii)同构造地层的倾角减小,以及iii)相关区域的水深半地堑越来越浅。这项研究为理解裂谷相关的半地堑和同裂谷地层的可变样式的起源提供了见解。此外,我们的建模结果对于评价裂谷中的烃源岩质量具有重要意义。最后,我们给出了一个使用MOVE软件研究断层盆地几何和演化的初步例子,值得进一步探讨。

更新日期:2021-06-15
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