渤南洼陷北部陡坡带砂砾岩体沉积特征研究

摘要

为揭示渤南洼陷北部陡坡带沙四上亚段的砂砾岩发育演化规律,寻找有利储层发育区,应用测井、录井、分层、岩心资料对区内标准井进行单井相划分,随后根据标志层对全区可用井进行纵向地层划分和对比,再统计各层砂岩厚度与砂岩百分比数据,做砂岩百分比等值线图,对砂体横向发育和展布特征进行描述.结果表明:渤南洼陷北部陡坡带沙四上亚段可划分为4个砂层组,主要发育有近岸水下扇相、半深湖-深湖相、砂岩滩坝相、盐湖相等多种沉积相类型,该区域主要发育有3个以Y109-2井、Y159井、Y161井为中心的近岸水下扇扇体,且纵向上自下而上扇体分布范围逐渐缩小.近岸水下扇相发育有厚层砂砾岩,是最有利的油气聚集区.%In order to reveal the development and evolution rules of glutenite in the upper subsection of the fourth member of the Shahejie Formation of the northern steep slope zone of Bonan sag,the favorable res-ervoir development area is found,and the well logging,hierarchy and core data are used to divide the stand-ard wells in the area.Then,the vertical layers are divided and contrasted to the available wells in the whole area according to the mark layer,and the data of sandstone thickness and percentage of each layer is coun-ted,to prepare the contour map of sandstone percentage,and describe the horizontal development and dis-tribution characteristics of sand body.The results show that:The upper subsection of the fourth member of the Shahejie Formation of the northern steep slope zone of Bonan sag can be divided into four sand groups, which mainly develops nearshore subaqueous fan facies,semi-deep lake-deep lake facies,sandstone beach bar facies and salt-lake facies and other sedimentary facies.Such area mainly develops 3 nearshore subaque-ous fan facies with well Y109-2,Y159 and Y161 as the center,and the distribution range of the fan body is gradually reduced vertically from the bottom up.The thick glutenite develops in the nearshore subaqueous fan facies,which is the most favorable oil and gas accumulation areas.