Strike-slip—thrust composite structures and its relationships to hydrocarbon in Hala’alate mountains,northern Xinjiang
Sun Ziming1, Hong Taiyuan1, Zhang Tao2
1. Exploration and Production Research Institute, China Petroleum and Chemical Corp., Beijing 100083; 2. Reginal Geological Survey, Bureau of Geology and Mineral Resources of Sichuan Province, Shuangliu, Sichuan 610213
The area of Hala’alate mountains, located in the north segment of the foreland thrust belt of the northwestern margin of the Junggar basin, was once considered to be a typical foreland thrust belt. Based on recent field geological survey and the comprehensive interpretations of seismic and MT exploring data, it was demonstrated that the regional evolution of Hala’alate mountains mainly experienced two stages. The first stage of deformation was thrust-nappe structures, accompanied by strike-slipping in Permian to Triassic, and the second stage of deformation was sinistral strike-slipping from Jurassic, revealed by the positive flower structure. Therefore, the existed structural styles in the area of Hala’alate mountains were, in fact, a superimposed structure, or a strike-slip——thrust composite structure. The Daerbute fault, as a west boundary fracture of the mountain area, thrusted towards the southeast in Permo-Triassic accompanied with subduction of the Altai Ocean and followed continent-arc collision. From Jurassic, it became a sinistral strike-slip fault. It was believed that the identification of the geological structure style should be helpful not only to interpretation of the seismic data, but also to the petroleum exploration. The anticlinal structures in the lower plate of the Daerbute fault should be potentials for oil and gas exploration, since they might be undeformed during the strike-slipping of the Daerbute fault in the Yanshanian-Himalayan movements.
Sun Ziming,Hong Taiyuan,Zhang Tao. Strike-slip—thrust composite structures and its relationships to hydrocarbon in Hala’alate mountains,northern Xinjiang[J]. Chinese Journal of Geology, 2008, (2): 309-320.