济阳坳陷古近系层序地层学研究综述

A SUMMARY OF THE PALEOGENE SEQUENCE STRATIGRAPHIC STUDIES OF THE JIYANG SAG

济阳坳的层序地层研究开始于20世纪80年代末期,经历了初始引用、逐步推广到全面应用几个阶段,并在层序地层界面的划分和层序地层发育控制因素及填充模式及高精度层序地层等方面取得了重要进展,包括建立了济阳坳陷层序等时地层格架、分析了一、二、三级层序界面特征及体系域划分,确立了3种类型的层序填充模式,分别为干旱盐湖型、深水断陷湖盆型和浅水断陷湖盆型模式,阐述了具有特色的陆相断裂坡折带和低位扇理论,认为同沉积断裂活动对低位扇起到重要的控制作用。另外,在东营、沾化凹陷广泛开展了高精度层序地层学研究。在此基础上,针对济阳坳陷层序地层学的研究现状提出了今后的发展方向。

The sequence stratigraphic studies of the Jiyang Sag were begun at the end of the 1980s and have passed through three stages of initial usage, gradual popularization, and universal application. Great advances have been made in the division of the sequence stratigraphic interfaces, control factors of the sequence stratigraphic development, infilling models and high-resolution sequence stratigraphy, including the establishment of the first-, second-, and third-order sequence interfaces and the division of the system tract, thus, forming three types of sequence infilling models, namely dry salt lake, deep-water rift lake basin, and shallow-water rift lake basin. Theory about the characteristic continental faulted slope-break zones and low fans is elaborated. It is regarded that synsedimentary fault movement had important controlling effects on the low fans. In addition, an extensive high-resolution sequence stratigraphic study has been carried on in the Dongying and Zhanhua depressions. On this basis, a developmental direction in the present sequence stratigraphic study of the Jiyang Sag has been suggested.