辽西南洼东营组层序地层格架下的沉积相特征及演化  

Sedimentary Facies and Evolution of Dongying Sequence Stratigraphic Framework in Southern Liaoxi Sag

作　　者：柴永波 达丽亚 杨海风 王粤川 

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《山东科技大学学报（自然科学版）》2015年第4期37-42,共6页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家重大科技专项项目(2011ZX05023-002)

摘　　要：运用沉积学、层序地层学、地震学等多学科方法,结合钻测井、三维地震资料,将研究区古近系东营组划分为东三段层序、东二下亚段层序、东二上亚段层序和东一段层序共四个三级层序。受控于古地貌及断层活动性的时空差异,不同沉积时期沉积体系发育特征明显不同。东三段层序和东二下亚段层序沉积时期处于盆地断陷期,沉积体系类型主要为近源的扇三角洲;东二上亚段层序沉积时期为盆地的断-坳转换时期,沉积体系类型逐渐演变为远源的辫状河三角洲沉积;东一段层序沉积时期凹陷整体地形变缓,以外源沉积为主,形成全区统一的河流-泛滥平原沉积。By using the methods of sedimentology, sequence stratigraphy and seismology.and by analyzing the drilling and logging data as well as the 3D seismic data,the paleogene Dongying formation in the research area were divided into four third-order sequences： the third member of Dongying formalion sequence, the lower sub-member of the second member of Dongying formation sequence,the upper sub-member of the second member of Dongying formation sequence,and the first member of Dongying formation sequence. Controlled by palaeogeomorphology and fauh activi ty,the characteristics of depositional systems in different sedimentary periods differ from each other significantly. The sedimentary period from the third member of Dongying formation sequence to the lower sub-nlemher of the sec ond member of Dongying formation sequence is fault depression stage of the hasin,and the main type of the depositional system is near source fan-delta deposition. The sedimentary period of the upper sub member of the second member of Dongying formation is the rift-depression stage of the basin, and the main type of depositional system gradually turns into far source braided river delta deposition. During the sedimentary period of the first member of Dongying formation sequence,the terrain of the basin became gentle,and the dominant type of the depositional system is outside source deposition,forming the river-flood plain sediments in the whole research area.

关 键 词：辽西南洼 东营组 层序地层 沉积体系 

分 类 号：P628[天文地球—地质矿产勘探]