晚期海西运动在塔里木盆地北部油气藏形成中的作用

ROLE OF LATE HERCYMAN OROGENY IN THE FORMATION OF OIL-GAS POOLS IN THE NORTHERN TARIM BASIN

海西晚期，塔里木板块总体为挤压背景。有资料表明，该时期存在两次性质差异较大的构造运动：早二叠世末期和晚二叠世末期构造运动。前期运动以火山活动、海防变迁为特征；后期以沉积构造格局改变、褶皱、断裂活动为特征，并叠置于前期构造之上。晚期海西运动最终定型的古隆起控制了油气聚集指向，形成的古生代坳陷和中新代坳陷控制着油源区展布，造成了众多的、具有捕获油气能力的圈闭类型。断裂和区域性不整合面为油气运移提供了通道，而且对油气再分布及破坏亦有一定影响。

The general setting of Tarim basin was shown in compression at Late Hercynian orogeny. The data show two-time different lectonic movements,one is of late stage of Early Permian,the other of late stage of late Permian. The former is characterized by volcanic activities and esa-land changes,the latter by change of sedimentary structural network,fold and fractuer acitivities,and overlapping the former one. The palaero-uplift shaped in final by Hercynian Orogeny controlled the structures of oil-gas concentration. The depressions of Palaeozoic and Mesozoic and Cenozoic conrtolled the extension of oil source area,resulting in a lot of traps capable of capturing oil and gas. The fractures and regional unconformities supply the runnel for the migration of oil and gas, and also have effect on the re-distribution and destruction of oil and gas.