泊尔江海子断层分段演化特征及其对太原—山西组的控制作用

鄂尔多斯盆地北部杭锦旗地区自西向东发育了三眼井、乌兰吉林庙、泊尔江海子等断层雁列式展布的断裂带，断裂带南、北两侧地层及圈闭类型均存在差异，其中南侧储层分布除了受相带控制外，还与断层活动密切相关，但断层对沉积的控制作用尚不清楚。为此，利用三维地震资料研究泊尔江海子断层构造特征，基于区域动力学机制深入认识断层演化规律，分析断层活动对储层的控制作用。研究表明：①现今的泊尔江海子断层由5条次级孤立断层相互连接而成。海西期泊尔江海子断层呈分段式逆冲活动，侏罗纪晚期泊尔江海子断层发生大规模的逆冲运动而发展成为一个整体，随后又在早白垩世—新近纪的多期伸展—挤压旋回中发生构造反转和改造，形成现今断裂构造格局。②太原—山西组沉积期，泊尔江海子断层的传递带与南部沉积体展布具有良好对应关系，相邻断层间的传递带或不活动断层控制南部大型沉积体的发育及展布。

Segmented evolution of Borjianghaizi faults and their control on Taiyuan-Shanxi Formations

The Sanyanjing faults,Wulanjilinmiao faults and Borjianghaizi faults are distributed in an echelon form from west to east. They are composed of a dominant fault zone in the Hangjinqi area in the northern Ordos Basin. The formations and traps on the two sides of the fault zone are different. The reservoirs on the south side are closely related to fault activities besides the control of sedimentary facies. How fault activities control sedimentation is not clear. We studied the structural characteristics of the Borjianghaizi faults by using 3D seismic data,and analyzed the evolution of the faults according to regional dynamics and the control of fault activities on the reservoir distribution. The following conclusions have been drawn:①Today's Borjianghaizi fault zone is composed of five secondary isolated faults. These faults were segmented and thrusting during the Hercynian period,then they were interconnected with the large-scale thrusting movement of the Late Jurassic during the Yanshanian Period,and underwent structural inversion and transformation in the multi-stage extensional- compressional cycles from the Early Cretaceous to the Neogene,and consequently today's structural pattern is presented. ②During the Taiyuan-Shanxi period,the structural transfer zones between the faults were well corresponding to the distribution of sediments on the south side,and the transfer zones or inactive faults controlled the development and distribution of large sedimentary structures in the south.