Segmented evolution of Borjianghaizi faults and their control on Taiyuan-Shanxi Formations
XU Litao1, SHI Wanzhong1,2, WU Rui1, WANG Ren1, XU Qinghai3, ZHANG Xiaoming1
1. Faculty of Earth Resources, China University of Geo-sciences(Wuhan), Wuhan, Hubei 430074, China; 2. Key Laboratory of Tectonics and Petroleum Resources of the Ministry of Education, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China; 3. College of Earth Science, Yangtze University, Wuhan, Hubei 430100, China
Abstract：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.
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