四川盆地基底结构的新认识

四川盆地基底已研究多年，取得一定的共识；但有些基础地质问题，尚值得探讨。如四川盆地西缘的基底是否属大扬子地台的一部分？盆地基底从老至新由不同时代前震旦系三层结构组成，对后期古隆起形成有什么影响？其板块构造演化模式是什么？盆地基底断裂对后期构造变形有什么影响？四川盆地深部岩石圈结构特征，对中新生代构造变形及地温场有何影响等等，将是人们勘探油气关心的基础地质问题。该文在近几年来积累的大量地质和地球物理资料基础上，结合过去研究的成果，提出一些新认识，与读者探讨。

NEW RECOGNITION OF BASEMENT IN SICHUAN BASIN

The basement of Sichuan Basin has been researched for many years and got some of same recognition,but some basic geological questions still need discussing. For example,whether the block of basement on the western marginal Sichuan Basin belongs to the partment of huge Yangtze platform or not? The basement of Sichuan Basin is consisted of three formation textures. What effects will it have on the formation of the paleolift? and what is the model of evolution of plate teclonics? What effects will the fault, of basement have on the deformation of the later structure? What effects will the deep lithosphere have on the deformation of the Meso Eozoic structure and the geothermic field? These are some important questions for exploration petroleum. According to the large geological and geophysical data in last decade, this paper discusses these questions and suggests some new recongnition to discuss them with readers.