车排子凸起位于准噶尔盆地扎伊尔山前,是夹持在南部四棵树凹陷和东部沙湾凹陷之间的三角构造带.然而对于这个三角构造带是原地掩伏构造,山前推覆构造,还是走滑构造控制形成的认识还存在争议.目前对于车排子凸起与沙湾凹陷过渡带的构造变形特征以及变形机制的认识尚不清楚.而过渡带是研究该区构造变形与演化的良好区域,精细研究该区域构造几何学与运动学对于揭示其构造变形机制以及认识盆山之间的关系具有积极作用,并对于该区油气勘探具有重要意义.本文以研究区的连片三维地震资料为基础,运用不整合面识别、轴面分析及平衡剖面等方法,对车排子凸起与沙湾凹陷过渡带进行精细的构造解析、建模与构造复原.研究表明,过渡带发育下二叠统(P1j-P1f),中二叠统(P2x-P2w),上二叠统(P3w),三叠系(T),侏罗系(J),白垩系(K)与古近系—第四系(E-Q)7个构造变形层序.发育佳木河组底部及石炭系内部滑脱层.深部(前二叠系)构造楔发育于整个过渡带,其个数和几何学形态的变化直接影响了上覆背斜形态.构造楔在早二叠世开始楔入,挤压作用持续至三叠纪末期.晚三叠世发育生长地层,显示了P-T构造层褶皱变形的时间,随后三叠纪末期,过渡带受到来自西北缘造山带方向的逆冲推覆构造的叠加作用,表现在后缘发育一系列叠瓦构造,推覆距离约为8 km,南部逆冲断层上盘二叠系—三叠系被剥蚀完全,北部残余少量下二叠统佳木河组.“,”Chepaizi uplift is a triangle structural belt,which located in Zaire Mountain front and retained between the Sikeshu sag in the south and the Shawan sag in the east.Yet the structural origin of this belt as an autochthonous covered structure,piedmont nappe structure or strikeslip structure remains an open question.The deformation feature and mechanism of Chepaizi uplift and Shawan sag transitional zone is still not fully understood.Transition zone is a good area for the study of the structural deformation and evolution.To discuss the geometry and kinematics of the transition zone is of great value to reveal the tectonic deformation mechanism and basin-and-range relationship,and to future guild oil-gas prospecting.Based on high-quality 3D seismic profile covering most of the study region,we do the accurate structure elucidation,structural modeling and reconstruction by employing unconformity identify,fault-related-fold theory and balanced restoration.Our study shows that seven unconformities and seven tectonic sequences consisting of P1j-P1f,P2x-P2w,P3w,T,J,K,E-Q are observed.The base of Jiamuhe Formation and inner of Carboniferous develop detachments.The deep structural wedges are developed across the study region,the number and geometry of these wedges directly affect the geometry overlying anticline and the difference in different segments.The structural wedges form in the Early Permian and the compaction continues to the Late Triassic.The growth strata grows in Late Triassic and shows the folding time of the P-T tectonic sequence.Afterwards the imbricate overthrust structures from the orogenic zone in the northwest superimpose in this transitional zone in the Late Triassic,and the displacement of the nappe is about 8km.The Permian-Triassic strata on the hanging wall of thrust faults has been totally denuded in the southern zone while little Jiamuhe Formation remaining in the northern zone.