摘要
盆地的成生和发展塔里木曾经历三个明显的发展阶段,即前震旦纪地槽、古生代地台和中新生代盆地。它具有统一的前震旦系结晶基底,广泛的古生界基础和巨厚的中新生界盖层。基底:由太古界、元古界(不包括震旦系,下同)的中深变质岩组成。据航磁资料,可分三个区,即北部平缓负异常区(柯坪—阿瓦提—库车一带)、南部北东向宽缓正负相间异常区(北纬39°以南)、中部东西向正异常区(北纬39°—40°)。其基底埋藏深度详见表1。
Abstract
The Tarim basin is the largest inland basin in China,covering an areaof about 0.56 m.sq.km.Considerable work was done in the past of petro-leum prospecting and exploration but was mainly confined to the Kuqa and the Southwestern depressions.Generally speaking,the basin has not been studiedfully.The writer has made an evaluation of the basin in three aspects.Firstly,based on data of stratigraphy,the sedimentary and tectonic evolution of the basin has been described;the structural systems and divisions,as well asthe features in the development of local structures has been expounded fromthe viewpoint of geomechanics and traditional geology;an explanation of main oil source beds,reservoirs and types of potential oil and gas traps hasbeen presented thereafter.Finally,the writer suggested that the Tarim basin would be a verypromising area for oil and gas.According to the available data,it is pointedout that the oil and gas potential varies in following descending order:the Southwestern depression,the Eastern depression and the Kuqa depression,the Central uplift,and the Southeast fault-step area.
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