塔里木盆地区域构造特征

本文通过对塔里木盆地航磁资料的综合解释,探讨了该区深部基底构造及区域构造特征。指出在盆地深部存在一个较古老的结晶地块,它对盆地的形成及发展起着明显的控制作用。通过对重、磁及地震测量资料的分析,探讨了该区古生界、中生界及新生界等构造层发育的一般概况;并将盆地内划分为中央隆起带、西南拗陷带、塔东拗陷区、塔北隆起区、库车山前拗陷及塔东南断阶构造带等单元;指出了该区断裂发育及华力西期基性岩的分布情况。最后对西南拗陷带及塔东拗陷区的油气远景作了初步评价。

THE CHARACTERISTICS OF REGIONAL GEOLOGICAL STRUCTURE OF TARIM BASIN,CHINA

This paper discusses the basement structure and the characteristics of regional geological structure of Tarim basin on the basis of its aeromagnetic data. The author points out that there is an ancient crystalline basement which evidently controlled the development of the basin in its late stage. Through analyses of the gravimetric, magnetometric and seismometric data, the author discusses the general features of development of the Palaeozoic, Mesozoic and Cenozoic tectonic sequences in this region, and divides the basin into the following geotectonic elements: the Central upwarped Zone, the Southwestern downwarped Zone, the East-Tarim downwarped region, the North-Tarim upwarped region, the Kuche piedmont depressed Zone and the Southeast-Tarim Fault Block Zone. The development of the fractures and the distribution of basic rocks of Variscan age are also mentioned. Finally, a preliminary evaluation of the oil-bearing perspective of the Southwestern downwarped Zone and the East-Tarim downwarped Region is proposed.