“塔里木-扬子古大陆”重建对无机成因油气的作用

Reconstruction of Tarim-Yangtze Paleocontinent model and its implications for the generation of inorganic petroleum

同位素年代学、岩石学、构造学、古生物学的研究表明:从新元古代至二叠纪,塔里木古陆块与扬子古陆块更加靠近,组成了"塔里木—扬子古大陆"。后经"峨嵋地幔柱"的作用和二叠纪"峨嵋地裂运动"的拉张,"塔里木—扬子古大陆"裂解、分离。文中讨论了地幔柱与无机成因油气生成的关系。根据上述研究,预测四川松潘—甘孜褶皱带是可望获得油气勘探突破的靶区。

According to the isotope chronology, petrology, tectonics and paleontology, the geological characteristics of Yangtze paleo-plate and Tarim paleo-plate are discussed. The study results show that the Yangtze paleo-plate was close to Tarim paleo-plate from the Neoproterozoic to the Permian and became a paleo-continent named Tarim- Yangtze Paleocontinent. Under the action of ＂Emei mantle plume＂ and the extension of ＂Emei Taphrogeny＂, the Tarim-Yangtze Paleocontinent diverged and separated. The relation between the mantle plume and the generation of inorganic petroleum is discussed. It shows that Songpan-Ganzi folded belt in Sichuan province is a favorable target for a breakthrough of petroleum exploration.