摘要
沉积微相分析是剩余油分布研究的基础。以东营凹陷东辛油田辛23断块区沙二段为对象,综合利用测井、录井、岩心等资料,从岩石类型及其组合特征、沉积构造和古生物特征、粒度特征、电测曲线特征等方面入手,对沙二段沉积微相进行详细研究;并进一步分析其对研究区剩余油分布的控制作用。结果表明:辛23断块区沙二段发育三角洲相、河流相、湖泊相3种沉积相,可划分出三角洲前缘亚相、三角洲平原亚相、曲流河亚相、滨浅湖亚相4种亚相,共识别出主河道砂坝、分流河道、河口坝、决口扇、水下分流河道等14种沉积微相。沙二段2砂组、3砂组、5砂组、6砂组主要发育主河道砂坝、分流河道及河口坝等优质沉积微相,砂体发育厚度大、孔渗性好,是研究区目的层剩余油分布的重要层位,蕴含70%的剩余油量。
Sedimentary microfacies study is the basis of the remaining oil distribution investigation. Workflow includes,integrating palaeontological feature with sedimentary texture and structures,rock types and their assemblages were presented,to investigate sedimentary microfacies of Es2 member of Xin 23 fault blocks,Dongxin Oilfield,Dongying Depression based on the drilling,well logging,and core data. It also includes determining the sedimentary microfacies controlling on remaining oil distribution of the target zones. The result indicates Es2 member of Xin23 Fault Blocks developed three types of sedimentary facies： delta,lake,and fluvial facies. They can be divided into 4 subfacies： delta plain,delta front,meandering river,and shallow lake subfacies. In addition,14 sedimentary microfacies could be recognizes,such as channel sand bars,river mouth bar,distributary channel,crevasse splay,and underwater distributary channel. Meanwhile,the main sedimentary microfacies of the Es2,3,5,and 6 formations are channel sand bars,river mouth bar,and distributary channel sand,which had large thickness of sand bodies with high porosity and permeability. Subsequently,remaining oil with higher percentage（ occupying70%） is distributed in the five formations of the study area.
出处
《科学技术与工程》
北大核心
2017年第26期208-214,共7页
Science Technology and Engineering
基金
国家自然科学基金(40772132)
中国石油大学胜利学院重点科研计划(KY2015013)资助
关键词
沉积微相
沙二段
辛23断块
剩余油分布
sedimentary microfacies Es2 member Xin23 Fault Block remaining oil distribution
