塔里木盆地巴楚隆起东段北东向走滑断裂特征

通过对塔里木盆地巴楚隆起东段地震资料的精细解释,发现研究区发育一系列NE、NEE走向的走滑断裂及逆冲滑脱断裂。主要构造样式有花状构造、平行高陡断裂带、滑脱逆冲叠加走滑断裂等。主要有4期构造活动:加里东中期压扭走滑、海西早期张扭走滑、海西晚期继承压扭走滑、喜山期继承活动。其中,加里东中期Ⅰ幕,开始形成NE走向的撕裂断层-调节断层。加里东中期Ⅲ幕,NE向走滑断裂大规模的沿先存NE向基底薄弱带和NE走向的撕裂断层-调节断层基础上开始发育,同时形成了几组NEE向压扭断裂带。加里东晚期海西早期,沿先存走滑断裂继承发育了一系列负花状走滑断裂。海西晚期、喜山期,部分NE向断裂再次开启继承发育。走滑断裂对碳酸盐岩储集层具强烈的改造作用,具备发育多种圈闭类型的潜力,是油气藏保存和再调整的关键因素。

The Characteristics of North-East Strike Slip Faults in Eastern Bachu Uplift of Tarim Basin

The predecessors did not study strike-slip faults in the eastern section of Bachu uplift in Tarim Basin,This pa- per analyzes and discusses the tectonic pattern, formation period and tectonic evolution of the seismic data in the eastern section of Bachu uplift in Tarim Basin.It is found that there are A series of strike-slip faults in the NE and NEE,and thrust-slip faults.The main structural styles are Flower structure,Parallel high steep strike-slip faults,and Sliding thrust su- perposition slip fracture.North East sliding faults developed in the whole area.The strike-slip faults mainly has 4 phase activities:Twisting produces strike-slip faults in the Middle Caledonian period,Stretchingproduces strike-slip faults in the Early Hercynian,Late Hercynian inherited the pressure slip,Himalayan period inheritance activities.In the middle stage of Caledonian ActⅠ,On the basis of the weak belt of the northeast-to-basement,the northwest-direction thrust fault zone began to form a northeast-direction tear fault-adjustment fault. In the middle period of Caledonian Act III,A large scale Northeast strike-slip faults developed along the weak zone of the preemption basement.At the same time, several groups of NEE torsional fracture zones have been formed.Late Caledonian-Early Hercynian period,led to the develop- ment of a series of negative flowered slip faults along the top of the upper Ordovician system-the lower Carboniferous system.In the late Hercynian period and the Himalayan period,part of the north-east fault once again opened up inheri- tance and development.Strike-slip faults has a strong effect on carbonate reservoir,controls the development of multiple traps,it is a key factor in the preservation and adjustment of oil and gas reservoirs.