辽河盆地东部凹陷古近系沙河街组层序地层及沉积相研究  

Sequence stratigraphy and sedimentary facies in the Shahejie formation of the Paleogene in Dongbu sag,Liaohe basin

作　　者：刘晓晶[1] 谢庆宾[1,2] 徐翔[1] 李军[3] 王旅丽 宋一帆[1] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [3]中国石油辽河油田分公司勘探开发研究院,辽宁盘锦124010

出　　处：《东北石油大学学报》2015年第6期1-11,13,共11页Journal of Northeast Petroleum University

基　　金：国家自然科学基金项目(ZX20120090)

摘　　要：根据岩心、测井和地震资料综合分析结果,研究辽河盆地东部凹陷沙河街组层序地层划分、沉积相类型及展布特征,东部凹陷沙河街组层序地层格架中识别出3个三级层序界面(SB1、SB2和SB3),划分2个三级层序(SQ1和SQ2);识别出冲积扇相、扇三角洲相、辫状河三角洲相、浊积扇相和湖泊相等沉积相类型.基于层序地层格架的划分和层序格架沉积砂体的特征研究,结合岩心相、测井相及地震相分析,绘制东部凹陷沙河街组不同层序的沉积相平面展布图.根据东部凹陷沙河街组沉积相空间展布及演化规律,结合沉积相分布控制因素分析,提出东部凹陷沙河街组沉积相模式,盆地陡坡带短距离搬运的沉积物质在陆上堆积形成冲积扇,进入水体发育扇三角洲、浊积扇体等;缓坡带沉积物搬运距离相对较远,多发育辫状河—辫状河三角洲等远源沉积体系.According to the integrated research on cores,well logs and seismic data,the sequence stratigraphic division and the features of sedimentary facies have been studied comprehensively.We identified three third-order sequence boundaries,thus divided the succession into two third-order sequences in the Shahejie formation.Besides,we identified many kinds of sedimentary facies,such as alluvial fan,fan delta,braided river delta,turbidite fan and lacustrine facies.Based on the study of sequence stratigraphic framework division and depositional bodies,in combination with analyses of cores,logs and sedimentary data,we delineated the sedimentary facies distribution map of two sequences in the Shahejie formation.According to the study of distribution features and evolution laws of sedimentary facies,and the analyses of control factors,the sedimentary facies model of this period was built.In the east steep slope zone of basin,sediments transport in a short distance and develop alluvial fan on land and fan-delta,turbidite fan under water.In the west gentle slope zone of basin,braid river-braid river delta distal sedimentary system is formed because of the relatively far transportation distance of sediments.

关 键 词：层序地层 沉积相 沉积模式 沙河街组 古近系 东部凹陷 辽河盆地 

分 类 号：TE122.3[石油与天然气工程—油气勘探]