塔里木盆地顺托果勒地区三叠系划分与对比

摘要

The Triassic in Shuntuoguole area of Tarim basin is composed of lower Ketuer formation, middle Akekule formation and upper Halabatang formation, and characterized by individual electric property and lithology, of whieh the pure mudstone member of Ketuer forma- tion and the mud-sihstone member of Halahatang formation ,are marker beds for regional correlation, and six abundant sporopollen assem- blages are built up. This paper discusses in detail the characteristics and time-space distribution of these assemblages, and verifies that there exist stratigraphic breaks between Lower and Middle Triassic strata or Middle and Upper ones, and in the top of the Upper Triassic se- rious denudation was undergone, and one or two sporupollen assemblages were missing. Moreover, the Triassic can be divided into three two -order seismic sequences which correspond to above three series of Triassic, and three two-order and/or five th tee-order drilling sequences.%塔里木盆地顺托果勒地区下三叠统柯吐尔组（上、下段）、中三叠统阿克库勒组（上、下段）和上三叠统哈拉哈塘组，岩性、电性特征明显，柯吐尔组下段上部的“纯泥岩段”及哈拉哈塘组上部的“大泥巴”为区域对比标志层。在3个组中均获丰富的孢粉化石，建立了6个化石组合，详细讨论了孢粉组合特征与时空分布。确定该区下三叠统与中三叠统、中三叠统与上三叠统之间均存在地层缺失，上三叠统顶部遭受严重剥蚀，缺失1-2个孢粉组合；三叠系可划分为3个二级地震层序，分别对应于3个统；钻井层序地层可划分为3个二级层序、5个三级层序。