| 库车前陆冲断带克拉苏构造带变形影响因素分析——基于离散元数值模拟研究 |
| |
| 引用本文： | 李维波,李江海,王洪浩,黄少英,能源.库车前陆冲断带克拉苏构造带变形影响因素分析——基于离散元数值模拟研究[J].大地构造与成矿学,2017,41(6):1001-1010. |
| |
| 作者姓名： | 李维波 李江海 王洪浩 黄少英 能源 |
| |
| 作者单位： | 1. 中国科学技术信息研究所,北京 100038;造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京 100871;北京大学石油与天然气研究中心,北京 100871;2. 造山带与地壳演化教育部重点实验室,北京大学地球与空间科学学院,北京 100871;北京大学石油与天然气研究中心,北京 100871;3. 中国石油塔里木油田研究院,新疆库尔勒,841000 |
| |
| 基金项目： | 国家科技图书文献中心重大专项服务项目"深地资源勘查开采重点专项服务"，"库车盐构造变形特征分析和区域变形场建立" |
| |
| 摘 要： | 在解释库车前陆冲断带克拉苏构造带三维地震剖面的基础上,采用离散元数值模拟手段、单因素变量控制方法,通过六组模拟对比实验,探讨挤压背景下应变速率大小和作用时间、盐岩展布形态、先存盐底辟、基底先存断裂以及基底古隆起等因素,对库车前陆冲断带克拉苏构造带变形的影响。离散元数值模拟结果表明:相比于应变速率大小,应力作用时间对冲断带变形的影响更为显著,变形缩短率相同时导致挤压隆升幅度更大,可达70.25%,向前传播距离均更远,横向上变形范围可达73.82%,盐下层叠瓦状逆冲断裂倾角更小。先存底辟主要影响挤压端垂向变形规模,使得隆升幅度更大。先存断裂主要影响挤压端水平方向变形范围,挤压变形水平传播更远。基底古隆起和盐岩展布形态对克拉苏构造带变形也具有重要影响,基底隆起前沿形成应力集中带,盐岩在此聚集形成构造三角带。由于盐岩的分隔作用,盐上层变形相对较弱,靠近挤压端发育背斜和冲断构造,向盆地方向逐渐变为宽缓的向斜构造。
|
| 关 键 词： | 库车前陆冲断带 离散元数值模拟 克拉苏构造带 影响因素 变形特征 |
Deformation Mechanisms of Kelasu Tectonic Belt in Kuqa Foreland Thrust Belt: Insight from Discrete Element Numerical Simulation |
| |
| LI Weibo,LI Jianghai,WANG Honghao,HUANG Shaoying,NENG Yuan.Deformation Mechanisms of Kelasu Tectonic Belt in Kuqa Foreland Thrust Belt: Insight from Discrete Element Numerical Simulation[J].Geotectonica et Metallogenia,2017,41(6):1001-1010. |
| |
| Authors: | LI Weibo LI Jianghai WANG Honghao HUANG Shaoying NENG Yuan |
| |
| Abstract: | Influence factors including compressive stress and time, salt rock occurrences, pre-existing salt diapirs, pre-existing basement faults and basement uplift of the Kelasu tectonic belt are analyzed through discrete element numerical simulation on the basis of the interpretation of 3D seismic profiles in the Kelasu tectonic belt of the Kuqa foreland thrust system. Discrete element numerical simulation results show that the duration time is a much more significant factor of deformation than the magnitude of compressive stress itself, which leading to greater uplift amplitude and larger horizontal deformation range. The pre-existing salt diapir contributes significantly to the scale of vertical deformation, and thus increases the uplift. The pre-existing faults mainly influence the range of horizontal deformation, i.e., extending the reaches of the horizontal deformation. Basement uplift and the salt distribution pattern also have important influences on the deformation of the Kelasu tectonic belt. Salt rock gathered in the stress weak band near the basement uplift. Due to the buffering of salt rocks, deformation of the upper-salt layer is relatively weak. Anticlines and thrust structures may develop in the extrusion frontier and wide gentle syncline gradually may form near the basin. |
| |
| Keywords: | Kuqa foreland thrust belt discrete element numerical simulation Kelasu tectonic belt influence factors deformation characteristics |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
