| 库车前陆盆地东部侏罗系逆冲构造变形及应力演化分析 |
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| 引用本文： | 庞菲菲,唐永,宋换新,唐文军.库车前陆盆地东部侏罗系逆冲构造变形及应力演化分析[J].地质科技通报,2021,40(5):123-135. |
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| 作者姓名： | 庞菲菲 唐永 宋换新 唐文军 |
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| 基金项目： | 国家科技重大专项2016ZX05002-006湖北省教育厅科学研究计划项目T201905 |
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| 摘 要： | 逆冲构造是较为常见的构造形式，其由弱到强的变形过程及应力定量分布状态目前还不是很清楚。以库车前陆盆地东部逆冲构造为例，基于构造剖面的解析，将逆冲构造活动分为4个阶段:初始期、发展期、成熟期和改造期，并运用有限元计算分析方法对不同阶段剖面进行了精细数值模拟计算。研究表明:逆冲构造的扩展并不是一个简单线性发展的过程，而是前翼、后翼不断往复迁移推进的历程。简单的逆冲断褶带发育于逆冲构造初始期，应力主要集中在后翼；变形向后翼扩展，转折端范围不断增加对应逆冲构造发展期，应力主要集中于转折端；变形向前翼扩展，前翼范围开始增大对应逆冲构造成熟期，应力主要集中于转折端和前翼靠近转折端区域；后翼掀斜，前翼竖直，前翼前缘大量新的逆冲断层发育对应逆冲构造改造期，应力主要集中于前翼前缘。理清逆冲构造变形过程及应力集中分布范围的差异，可为后期指导裂缝发育部位以及超压异常发育带的预测奠定较好的基础。
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| 关 键 词： | 逆冲构造 扩展形式 应力分布 差异 |
| 收稿时间： | 2021-01-04 |
Analysis of deformation and stress evolution of thrust structure: A case of Jurassic in east Kuqa Subbasin |
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| Abstract: | Thrust structure is a relatively common structural form, and its deformation process from weak to strong and the quantitative distribution of stress are not very clear. This study analyzes the tectonic profile in the eastern part of Kuqa Subbasin, and according to the complexity of deformation, the thrust tectonic activity can be divided into four stages: initial stage, development stage, mature stage, and reformation stage. And it uses the finite element calculation and analysis method to carry out detailed numerical simulation calculation on the different stages of the section. Research suggests that the expansion of the thrust structure is not a simple linear development process, but a process of continuous migration and advancement of the front and rear wings. A simple thrust fold is the initial stage of the thrust structure, and the stress is mainly concentrated on the rear wing; after deformation, it expands to the rear wing and the end area increasing continuously is the development period of the thrust structure, and the stress is mainly concentrated on the end; it expands to the front wing after deformation and the wing range beginning to increase is the mature stage of the thrust structure, and the stress is mainly concentrated on the end and the front wing near the end; the rear wing is tilted, the front wing is vertical, and a large number of new thrust faults developed at the front edge of the front wing are thrust structures; it is the period of thrust structural transformation, and the stress is mainly concentrated on the front edge of the front wing. To clarify the difference in the deformation process of the thrust structure and the distribution range of the stress concentration will lay a good foundation for the prediction of the fracture development position and the abnormal development zone of overpressure in the later stage. |
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