渤海湾盆地垦利6-1油田新近系明化镇组下段浅水三角洲沉积特征  

Sedimentary characteristics of shallow water delta in the Neogene lower member of Minghuazhen Formation,Kenli 6-1 Oilfield in Bohai Bay Basin

作　　者：廖新武 杨庆红 李超 郭诚 赵大林 LIAO Xinwu;YANG Qinghong;LI Chao;GUO Cheng;ZHAO Dalin(Bohai Petroleum Institute,Tianjin Branch of CNOOC Ltd.,Tianjin 300452,China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300452

出　　处：《岩性油气藏》2025年第2期1-11,共11页Lithologic Reservoirs

基　　金：中海石油中国有限公司(省部级纵向课题)“渤海水驱稠油油田特高含水期深度挖潜关键技术研究”(编号:KJZH-2024-2204)资助。

摘　　要：近年来,渤海湾盆地新近系发现了亿吨级储量规模的大油气田。综合利用地质、测井及地震资料,开展了渤海湾盆地垦利6-1油田新近系明化镇组下段浅水三角洲沉积特征及古环境研究。研究结果表明:①渤海湾盆地垦利6-1油田新近系明化镇组下段沉积时期为温带湿润气候,地形平缓,古地形坡度小于1°,平均水深小于6.5 m,物源来自北东方向且供给充足。②研究区储层岩性以岩屑长石砂岩为主,其次为长石砂岩域与长石岩屑砂岩,粒度概率曲线以2段式为主,发育多种反映水动力较强的沉积构造;测井曲线形态以钟形和箱形为主,地震剖面上可见低幅叠瓦状前积特征。③研究区V1小层水下分流河道延伸距离远,宽度窄,整体呈北东—南西向展布,最远延伸距离可达20.10 km,平均长度为10.06 km,水下分流河道砂体宽度为64~420 m,平均宽度为219.65 m,水下分流河道砂体平均厚度约9.42 m。综合沉积微相的平面展布和浅水沉积样式的刻画,研究成果可为油田后期新钻井的部署提供地质依据。In recent years,large oil and gas fields with reserves of billions of tons have been discovered of Neogene in Bohai Bay Basin.A comprehensive study was conducted on the sedimentary characteristics and paleoenvironment of the shallow water delta in the lower section of the Minghuazhen Formation of the Neogene in the Kenli 6-1 oilfield in the Bohai Bay Basin,utilizing geological,logging,and seismic data.The results show that:(1)The sedimentary period of Minghuazhen Formation in Kenli 6-1 Oilfield in Bohai Bay Basin was characterized by a temperate humid climate,gentle terrain,ancient terrain slope less than 1°,average water depth less than 6.5 m,and abundant supply of sediment from the northeast direction.(2)The reservoir lithology is mainly composed of lithic feldspar sandstone,followed by feldspar sandstone and feldspar lithic sandstone;the probability curve of grain size is mainly in a two-stage form,and various sedimentary structures reflecting strong hydrodynamics are developed;the logging curves are mainly bell shaped and box shaped,and low amplitude tile shaped progradation features can be seen on the seismic profile.(3)The V1 layer underwater distributary channel has a long extension distance and narrow width,and is distributed in northeast-southwest direction as a whole;the farthest extension distance can reach 20.10 km,and the average length is 10.06 km;the width of the underwater distributary channel sand body is between 64 m and 420 m,with an average width of 219.65 m;the average thickness of the underwater distributary channel sand body is about 9.42 m.Based on the comprehensive distribution of sedimentary microfacies,the shallow water sedimentary style of Minghuazhen Formation in Kenli 6-1 Oilfield in Bohai Bay Basin was summarized.The research results provide strong geological basis for new drilling in the later stage of the oilfield,and also provide comparative materials for the exploration and development of other shallow water delta sediments in the Bohai Bay Basin.

关 键 词：浅水三角洲 水下分流河道 叠瓦状前积 古气候 古水深 古物源 明化镇组下段 垦利6-1油田 渤海湾盆地 

分 类 号：TE121.31[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]