塔北隆起东部巴里英断裂的几何学与运动学特征

doi:10.11743/ogg20180512

摘要/Abstract

摘要： 巴里英断裂是塔里木盆地塔北隆起东部草湖凹陷与库尔勒鼻状凸起之间的分界断裂，解析其几何学与运动学特征对研究塔北古隆起东部地质结构和构造演化具有重要意义。基于大量地震反射资料，利用Petrel软件，对巴里英断裂进行精细的几何形态刻画，并实现三维可视化；利用平衡剖面复原的方法恢复研究区南北向地质结构剖面。结果表明：①巴里英断裂平面上呈弧状展布，倾向北东，产状较陡，断层倾角可达70°，具有上陡下缓的铲式逆断层性质；②断裂沿走向可分为3段，早期在西、东两段分别生长成核，随后两条独立的断裂在中段连锁成为一条断裂；断裂有两期主要运动事件，即晚古生代（加里东晚期—海西期）和中生代（印支期—燕山期），且前者的活动强度要明显大于后者；③断裂于石炭纪—二叠纪形成并快速发展，断层滑移量大，进入中生代后逐渐定型，三叠纪—早白垩纪断裂仍有活动，从而对中生界也产生了一定影响，新生代已停止活动。巴里英断裂对其上盘古生界和中生界结构起到了重要的控制作用，是草湖凹陷与库尔勒鼻状凸起的地层结构产生差异的主要原因之一。

关键词: 几何学, 运动学, 巴里英断裂, 草湖凹陷, 库尔勒鼻状凸起, 塔里木盆地

Abstract: Baliying fault serves as the boundary between the Caohu Sag and the Korla nose-shaped salient in the eastern Tabei uplift.The analysis of the fault geometry and kinematics plays a significant role in the study of the geological structure and tectonic evolution of the eastern Tabei paleo-uplift,Tarim Basin.Based on plenty of seismic reflection profiles crossing the Baliying fault,we used Petrel software to finely depict its geometry and realized 3-D visualization of the fault.In addition,the NS-trending geological structure profile crossing the study area was restored by means of balanced cross-section reconstruction.The results show that:(1) Baliying fault is in the shape of an arc horizontally and dips north-east.It is characteristic of the listric thrust fault with a high dip angle on top,which can reach 70°,but a gentler one at bottom;(2) Baliying fault can be divided into three segments.Two fault segments formed separately in the eastern and western parts in the early period,and then they got linked by a middle fault segment and developed into one fault.The fault experienced two major tectonic events during the Late Paleozoic(Late Caledonian-Hercynian) and Mesozoic(Indosinian-Yanshanian),and the intensity of the former is stronger than that of the latter;(3) Baliying fault formed and evolved rapidly with large fault slip during the Carboniferous-Permian.It finalized gradually during the Mesozoic,but minor movement continued throughout the Triassic and Early Cretaceous,influencing the Mesozoic sedimentation.Then the movement stopped in the Cenozoic.Bali-ying fault plays a significant role in controlling the Paleozoic and Mesozoic structure of its hanging wall;therefore,it is one of the main reasons causing the stratigraphic structural differences between Caohu Sag and Korla nose-shaped salient.

Key words: geometry, kinematics, Baliying fault, Caohu Sag, Korla nose-shaped salient, Tarim Basing

中图分类号:

TE121.2

陈槚俊,王峰,孙方源. 塔北隆起东部巴里英断裂的几何学与运动学特征[J]. 石油与天然气地质, 2018, 39(5): 976-983. doi: 10.11743/ogg20180512 Chen Jiajun,Wang Feng,Sun Fangyuan. Geometrical and kinematic characteristics of Baliying fault in the eastern Tabei uplift,Tarim Basin[J]. Oil & Gas Geology, 2018, 39(5): 976-983. doi: 10.11743/ogg20180512

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