塔里木盆地盆内震旦系特征

结合前人对盆地周边露头研究成果,根据钻井和地震资料给出了盆地上、下震旦统的沉积体系分布。以阿满地区相对隆起为界,震旦系厚度总体上为东西厚、中间薄,沉积中心分布在盆地的东、西两端,并以东北角的库鲁克塔格山前地带沉积最厚,下震旦统达3400m,上震旦统也达2000m以上。早震旦世塔里木盆地主要发育了塔东和塔西两个沉积沉降凹陷,构成了塔东海洋冰川—浅海沉积体系区、塔西滨浅海沉积体系区、阿满海岸沉积体系区以及塔西南浅海—次深海沉积体系区,塔东和塔西两个沉积区以阿满海岸沉积区为界近乎对称分布。晚震旦世是在早震旦世沉积填平补齐的基础上的继承性沉积。

Characteristics of Intrabasinal Sinian Sedimentary System in Tarim Basin

The intrabasinal Upper and Lower Sinian sedimentary systems in Tarim Basin are figured out according to the available data of drilled wells and seismic interpretation as well as outcrops of the basin. Awat-Manjar uplift separates Sinian deposits into the east and west deposcenters in the eastern and western parts of the basin. The thickest deposits are at the Kuruktag foreland zone in the northeastern part of the basin, in which Lower Sinian is up to 3400m and Upper Sinian is over 2000m thick. The thinnest deposits are at Awat-Manjar uplift in the middle part of the basin. The development of the east and west Tarim subsiding depressions during Early Simian constituted four areas of sedimentary systems: the East Tarim marine glacier-neritic system, the West Tarim littoral system, the Awat-Manjar coast system and the Southwest Tarim neritic-subabyssal system.