通过二维、三维地震资料解释与构造解析,明确了塔里木盆地塔中北坡发育多条北东向、北东东向走滑断裂带,在平面和剖面上识别出了6种走滑断裂活动的标志.研究表明,塔中北坡走滑断裂在剖面上呈直立断层、花状构造,北东向走滑断裂下部表现为明显挤压隆升,而上部则表现为继承性张扭负花状构造,具有"下拱上掉"的特征,表明了断裂的多期走滑活动.总体上可划分为中奥陶世末—志留纪压扭走滑断层、晚泥盆世—早石炭世张扭走滑断层和晚二叠世末逆冲断层三期,它们在空间上相互叠置.研究认为走滑断裂的变形强度控制了奥陶系裂缝及缝洞型储层发育范围,走滑断裂的分段性对优质缝洞型储层发育具有较强的控制作用.提出了在变形强度大的裂缝发育区、走滑断裂拉张部位的断洼区,以及受后期张扭走滑断裂叠加改造的断槽部位的串珠状地震反射异常体发育区,是下步寻找天然气规模储量的有利勘探方向.

Based on the structural interpretation and the analysis of 2 D/3D seismic data,it is identified that NE-trending/NEE-trending strike-slip fault zones are distributed in northern slope of Tazhong Uplift, and six identification marks of strike-slip fault in seismic slices and sections are summarized. Three types of strike-slip fault system which superimposed in space are developed, including compresso-shear faults(end of Middle Ordovician to Silurian),tenso-shear faults (Late Devonian to Early Carboniferous) and thrust faults(Late Permian). It is concluded that the development of fractured reservoir and fractured-vuggy reservoir was controled by the intensity of fault deformation,and the development of high-quality fractured-vuggy reservoir was dominated by the segmentation of strike-slip faults. It is suggested that the fracture zones with strong deformation, the pull-apart structure, and the trough fault zone where superimposed reformation by later faults and with beading seismic anomalies are favorable targets for exploring large-scale natural gas reservoir of Ordovician.