摘要
沉积构型对特高含水期隐蔽剩余油分布控制作用强,为实现构型及剩余油的量化表征,首先以典型曲流河点坝沉积模式为基础,在基于层面建模理念的指导下,提出了一套以曲流河点坝侧积泥岩顶底沉积界面的构建为核心的数学算法和计算机程序,实现了曲流河点坝概念模型建模。在此基础上,研发了实际构造分布和砂体分布背景下,侧积泥岩顶底界面形态的几何校正算法,实现了实际点坝的建模。以大港油田北部明化镇组曲流河点坝砂体为例,构建了概念和实体模型,通过基于概念模型的数值模拟提出了特高含水期点坝单砂体内部剩余油沿侧积泥岩与点坝顶面交线弧形条带状分布的特点。量化统计表明,点坝概念模型的数值上部1/3采出程度仅为7.8%,中部1/3采出程度为30.1%,底部1/3采出程度则高达65%,并以侧积体为单元量化分析了剩余油的富集规律。针对油田单一点坝内部直井注水-水平井采油的开发模式,通过设计模拟实验,比较了2种典型一注一采井配置关系对注水开发效果的影响。模拟实验表明,当注水直井在点坝上远离废弃河道处部署,水平井在靠近废弃河道一侧部署时,注水方向与侧积体加积方向一致,此时侧积泥岩的定向遮挡作用会增加注水流线的复杂程度,从而起到扩大波及系数、抑制含水上升的目的,具有较好的开发效果。
Reservoir architectures have a strong influence on the distribution of hidden remaining oil at extra high water cut stage. It is very crucial to implement the quantitative characterization of the reservoir architectures and the remaining oil bidden in them. This paper based on the classical sedimentary pattern of meandering fluvial reservoir and the concept of surface-based modelling, present a set of mathematical algorithm and computer programme for constructing the 3-D sedimentary top or bottom surfaces of lateral accre- tion mud layers, by which the 3-D conceptual model was built successfully. In order to build the 3-D architecture model of real sub- surface point bar, the geometrical correction algorithm of laterally-accreted mud layers for rugged terrain of reservoir top and varia- tion in thickness was developed. A case study was carried out in Minghuazhen Formation of Gangdong oilfield, in which both concep- tual and real models of point bar were built respectively. Based on the conceptual model, the reservoir simulation results show that the remaining oil at extra high water cut stage distribute along the arc-shaped intersecting line of lateral accretion surface and top of point bar. And from this simulation results at 95% water cut stage, the recovery factor of upper 1/3 part of the point bar conceptual model is 7.8%, middle 1/3 part is 30. 1%, and lower 1/3 part is 65%. Due to this surface-based modeling technique, the remaining oil analysis in each lateral accretion sandbody can be implemented easily. As a potential choice of meandering fluvial reservoir devel- opment in Gangdong oil{ield, the two kinds o{ well patterns, vertical well as water injector and horizontal well as oil producer, were studied through computer simulation experiments to compare the reservoir performance between each other. The simulation results showed that the well pattern, the horizontal producer is close to the clay plug in abandoned channel and the vertical injector is far from it, has a better performance than the opposite well pattern due to the complex stream line of injection water which results in the improvement of sweep efficiency and inhibition of water-cut.
作者
高兴军
宋新民
孟立新
纪淑红
和丽娜
陈建阳
周新茂
刘卓
Gao Xingjun Song Xinmin Meng Lixin Ji Shuhong He Lina Chen Jianyang Zhou Xinmao Liu Zhuo(PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China PetroChina Dagang Oil field Company, Tianjin 300280, China)
出处
《石油学报》
EI
CAS
CSCD
北大核心
2016年第B12期99-111,共13页
Acta Petrolei Sinica
基金
国家重大科技专项(2016ZX05010)资助
关键词
点坝
侧积泥岩
基于层面建模
剩余油
定量表征
注采井网
point bar
lateral-accretion mud layer
surface-based modelling
remaining oil
quantitative characterization
injection- production well pattern
