东营凹陷下第三系高分辨率层序地层研究

本文基于构造层序分析和基准面分析原理，建立了高分辨率地层格架，强调了构造演化对层序样式的控制。断陷湖盆的层序由低位体系域、湖扩展体系域和高位体系域组成，依据其低位体系域特征以及沉积体系的空间配置关系，划分出三种层序样式，其中生长断层型的低位体系域最发育；构造坡折型低位、湖扩展和高位体系域发育齐全，这与海相被动大陆边缘层序样式有类似性；滨岸缓坡型以浅水环境沉积体系为主。构造坡折的存在，为低位扇的发 育提供了广阔的空间，形成了低位三角洲、浊积扇及扇三角洲三种类型低位扇，它们是隐蔽油气藏勘探的主要对象。依据构造坡折带及低位扇发育规律，结合油气成藏条件分析，提出了新的勘探领域，经钻探取得了较好的经济效益，充分证明了层序地层学在陆相盆地中具有广阔的应用前景。

High-resolution Sequence Stratigraphy of Paleogene in Dongying Depression

Based on the analyses of structural sequences and base level, high-resolution stratigraphic framework is established and suggested a tectonic control on sequences formation in Dongying depression. The sequences developed in faulted lake-basin are composed of lomstand(LST),lake expansion(EST) and highstand system tracts(HST).They can be further grouped into three sequence styles, growth -fault style,structuracl-break style and ramp style, in the light of the features of lomstand system tracts and spatial configurations of depositional systems. The former is dominated by lowstand system tracts, the second is composed of complete three component system tracts(LST, EST and HST),which is similar to the pattern developed in marine passive continental margin, the last one is dominated by shallow-lake depositional packages. The structural break provides substantial accommodation space for the development of lowstand fan, which include lowstand deltas, turbiditic fans and fan-deltas. They are the major exploration targets for subtle hydrocarbon reservoir, which are of good commerical siginificances proven by drilling. This study shows a prosperous application of sequence stratigraphy into the esploration in continental basins.