The study of fratures and the characteristics ofYubei structural belts, Tarim Basin
Lu Renqi1,2, Liu Bo2, He Dengfa3, Zhang Xuefeng2, Huang Chenjun2, Liu Geyun3
1. Institute of Geology, China Earthquake Administration, Beijing 100029;
2. School of Earth and Space Science, Peking University, Beijing 100871;
3. College of Energy Resources, China University of Geosciences, Beijing 100083
The Yubei structural belts in Tarim Basin were occurring during the Mid-Late Caledonian movement. The major faults were thrusting and forming fault propagation folds. Most of these thrusts were not cut the unconformity layers between the Carboniferous and the Ordovician. The carbonate reservoirs of the Ordovician were developing the fault-related fractures and fold-accommodation fractures. These fractures were distributed at the kink bands and the fault propagation deformation areas. During the Late Hercynian movement, the Yubei thrusts were re-active and forming the trishear. The fault slipping was limited and the fractures only appeared in the trishear deformation areas. The Yubei structural belts were finally formed during the Late Permian Period and reformed during the Himalayan movement. Because of the Tibet Plateau is developing from the east to west, the Yubei areas are affected by the NE-SW tectonic stress field and have some weak deformation inner the basin. The Yubei major faults have some strike-slipping and tensile component, which may influenced the adjustment and migration of oil and gas.