摘要
油藏内部普遍存在阻碍或影响流体渗流的不连续界限,由于尺度小且难识别,不连续界限的等效表征是地质建模的主要技术手段。选取海上新近系河流相复合砂体,对其内部发育的接触型、切叠型、堆叠型3种不连续界限开展了等效表征方法研究。设计了机理模型和数值模拟基础方案,分别从连通网格数量、渗透率变化、传导率变化等3个方面开展了敏感性分析;在此基础上,对不同类型不连续界限等效表征方法的适用性进行了研究。结果表明,基于连通网格数量的等效表征方法较适合于接触型界限,基于模型渗透率的方法较适合于切叠型界限,基于网格面传导能力的方法更适合于堆叠型界限。心滩坝的等效表征实验及海上油田复合砂体表征结果表明,本文方法可实现储层不连续界限的精细表征。
There are generally discontinuity boundaries that hinder or affect fluid flow in oil reservoirs.Due to small scale and being difficult to identify,equivalent characterization is the main geological modeling method for discontinuity boundaries.Taking the offshore Neogene fluvial facies complex sand body as an example to study the equivalent characterization method of 3 types of discontinuity boundaries including contact channel type,stacked channel type and amalgamated channel type developed in the complex sand bodies.The mechanism model and the basic scheme of numerical simulation were designed,and sensitivity analysis was carried out from the 3 aspects,variation of connected grid number,permeability variation and conductivity variation.On this basis,the applicability of the equivalent characterization methods for different types of discontinuity boundaries was investigated.The results show that the equivalent characterization method based on the variation of the connected grid number is suitable for the contact channel type boundaries,the method based on the model permeability variation is suitable for the stack channel type boundaries,and the method based on the grid conductivity variation is suitable for amalgamated channel type boundaries.The equivalent characterization experiment of the mid-channel bar and the characterization of the sand body complex in the offshore oilfield show that the proposed method in the paper can realize the fine characterization of the reservoir discontinuity boundaries.
作者
肖大坤
范廷恩
范洪军
张显文
张利军
张晶玉
XIAO Dakun;FAN Tingen;FAN Hongjun;ZHANG Xianwen;ZHANG Lijun;ZHANG Jingyu(State Key Laboratory of Offshore Oil Exploitation,Beijing 100028,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)
出处
《中国海上油气》
CAS
CSCD
北大核心
2021年第2期114-122,共9页
China Offshore Oil and Gas
基金
中海石油(中国)有限公司科研课题“储层不连续界限预测及应用研究--三角洲沉积储层类型(编号:YXKY-2019-ZY-08)”部分研究成果。
关键词
河流相
复合砂体
不连续界限
等效表征
地质模型
fluvial facies
complex sand body
discontinuity boundary
equivalent characterization
geological model
