准噶尔盆地腹部白垩系底界划分

准噶尔盆地腹部白垩系与侏罗系界限存在着不同的划分方案,这给综合研究造成了混乱。白垩系与侏罗系的界线对应于燕山构造运动第Ⅱ幕产生的不整合面，在其这一不整合面上下发育众多地层-岩性圈闭,因此,白垩系底界的划分将直接影响地层-岩性圈闭的识别。基于生物群组合特征、岩性组合特征、地质模型、正演模型、地震反射等多方面资料进行不同方案的对比和论证,确定了合理的分层方案。

Classification of Cretaceous Bottom Boundary in Hinterland of Junggar Basin

There are several opinions on boundary classification between Cretaceous and Jurassic in hinterland of Junggar basin,which have caused the confusion in the stratigraphic correlation and the integrated exploration researches.The unconformity surface between the Cretaceous and the Jurassic is resulted from the second episode of Yanshan tectonic movement.There could be many litho-stratigraphic traps between them,so proper stratigraphic classification has influenced the recognition of litho-stratigraphic traps directly.This paper presents the correlation and demonstration of several opinions on the boundary classification based on much information about the character of biological combination,the character of lithology combination,the geologic model,the forward model,the seismic feature,etc.,has established the rational program for the stratigraphic classification.