关键词: 楚雄盆地, 构造, 构造特征, 构造演化, 油气聚集, 控制

Abstract: Chuxiong Basin is located at the southwest margin of Yangtze tectonic plate. The Red River fracture controls the southwest boundary of the Basin with a high angle transition from NWW in the southeast to NW of study area, then NWW again in the Qinghai-Tibet Plateau. Maximum principal stress orientation in the Basin has changed several times since Mesozoic from nearly SN to EW, the Red River fault has undergone left-lateral or rightlateral strike-slip movement, accompanied by internal block rotating, due to the continuous NNE compression stress generated by the Indian Plate movement from southwest to northeast, the existence of Jinsha River-Red River fracture, and the westward compression stress transferred from the Marginal-pacific tectonic domain east of China. The strike-slip movement and stress transfer of Red River fracture also cushion the extrusion deformation of the Basin. Base on the seismic interpretation of the whole Basin, in view of the complex depositional-tectonic characteristics of the Basin, this paper selects two regional seismic profiles of SN and EW orientations for tectonic evolution analysis with balanced-section technique, then analyzes the basement formation of the Basin, the dynamic driving mechanism and its derivative tectonic evolution, depositional migration, source-reservoir-cap rock assemblages, fault activities, igneous rock distribution and the condition of hydrocarbon accumulation since Late Triassic, on the basis of the regional tectonic background. It is concluded that: ① The maximum principal stress orientations have changed several times in the Basin since the Mesozoic Era, and controls the linkage effects among tectonic migration, distribution and thickness of source-reservoir-cap rock assemblages, fault features and hydrocarbon accumulation; ② The distribution of igneous rocks relates closely to the distribution of basement fractures, so much attention should be paid to the recognition of large basement faults in future exploration; ③ Source rock in western depressions of the Basin features in wide distribution, high thickness, thick cap rock, high shale content, and good sealing property, which is favorable for hydrocarbon generation and preservation. In particular, the long-term successive evolution structural belts or traps with SN-NW trends would be the prospecting domains of priority for further exploration

Key words: Chuxiong Basin, tectonic, tectonic characteristics, tectonic evolution, hydrocarbon accumulation, control