摘要
孤东油田馆上段54—68小层为辫状河沉积,储层内部结构复杂。该油田面临综合含水率特高、剩余油高度分散、稳产难度大等问题,开展储层层次结构的精细解剖是解决该问题的关键。为此,以心滩内部的精细构型表征为切入点,通过对砂体内部结构单元的解剖,分析孤东油田六区馆上段远源砂质辫状河心滩构型,以明确砂质辫状河储层内部不同级别的构型特征。采用密井网精细对比的方式,实现了对砂质辫状河心滩内部增生体规模的定量表征;确定了心滩宽度、长度及厚度等4级构型单元的参数范围,其中心滩宽度为100～350 m,长度为400～500 m,厚度为4～12 m;明确了心滩长度与宽度呈正相关,宽度与厚度呈近似正相关。确定了落淤层与增生体等3级构型参数分布特征,落淤层在滩头、滩尾及两翼平均倾角分别为0.93°,0.53°和1.47°,长轴方向的心滩内部单一增生体的长度为280～800 m,宽度为165～400 m,估算落淤层长度为250～700 m,宽度为150～350 m。
The small layers 54-68 in the upper section of Guantao Formation in No.6 Block of Gudong Oilfield are braided river deposits that have complex architecture.At present,this oilfield has faced several problems including extra-high water cut,high distribution of remaining oil,difficulties in stable production.Therefore,the key to solving those problems is to carry out fine anatomy of the reservoir architecture.The fine architecture characterization of the inner part of the sandy braid bar is taken as the entry point.The internal architecture of the sandy braid bar in the upper section of Guantao Formation in No.6 Block of Gudong Oilfield was analyzed.Combined with the characteristics of sedimentary microfacies of the sandy braided river of Gudong Oilfield,the different hierarchical levels of architecture interfaces in the sandy braided-river reservoirs were identified.Based on the well correction in dense pattern,the quantitative characterization of the scale of the reproduction body in the braid bar of the braided-river reservoir was realized.The range of parameters for four-grade archiTecture was determined.Among them,width is 100-350 m,length is 400-500 m,thickness is 4-12 m of the braid bar.The length of the braid bar has positive correlation with the width of the braid bar,and the width of the braid has almost positive correlation with the thickness of the braid bar.The range of parameters for three-grade architecture of the off-silt and acCretion body was determined.The average dip of the off-silt at the head of bar is 0.93°and that at the end is 0.53°and that at two wings is 1.47°,and the length of single accretion body in the braid bar at direction of long axis is from 280 to 800 meters,and its width is from 165 to 400 meters.The width of the the off-silt may be from 250 to 700 meters and its length may be from 150 to 350 meters.
作者
宋子怡
陈德坡
邱隆伟
乔雨朋
宋璠
刘卫
SONG Ziyi;CHEN Depo;QIU Longwei;QIAO Yupeng;SONG Fan;LIU Wei(Key Laboratory of Deep Oil & Gas Geology and Geophysics China University of Petroleum (East China),Ministry of Education,Qingdao city,Shandong Province,266580,China;School of Geosciences,China University of Petroleum East China,Qingdaocity,Shandong Province,266580,China;Exploration and Development Research Institute,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257015,China;Marine Mineral Resources Evaluation and DetectionTechnology of Marine National Laboratory,Qingdao City,Shandong Province,266071,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2019年第2期68-75,共8页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"特高含水后期整装油田延长经济寿命期开发技术"(2016ZX05011-001)
关键词
辫状河
心滩
构型
剩余油
馆上段
孤东油田
braided river
braid bar
architecture
remaining oil
upper section of Guantao Formation
Gudong Oilfield
