Abstract: The Tarim-south China massif was taphrogensised after Middle Triassic.Due to the change of the reginal tectonic pattern during the formation of the Sichuan basin, the lower Paleozoic hydrocarbon has been originated in Sichuan basin and has undertaken two and one proccesses of migration-accumulation before and after the traphrogeny respectively.It is predicted that the present gas pools should be disduted at the margins of the broom anticlinal areas of the southeast Sichuan, where the conservation features would be better in the anticlines of the structural highs.

Key words: Tarim-south China massif, Sichuan basin, lower Paleozoic, oil and gas reservoir, migration, accumulation

摘要： 塔里木-华南地块于中三叠世后裂解。裂解前,四川下古生界油气已经形成,并且经过了两次运聚过程;裂解后,又经过一次运聚过程。这是因为四川盆地形成过程中,区域构造格局变化而发生的。据判断,现今天然气分布的地带应该是川东南帚状背斜区的边缘地带,那里构造高部位、保存条件好的背斜中,应该有气藏。

关键词: 塔里木—华南地块, 四川盆地, 下古生界, 油气藏, 运移, 聚集