裂缝性油藏离散裂缝网络随机生成及数值模拟  

Study on discrete fracture network random generation and numerical simulation of fractured reservoir

作　　者：杨坚[1] 吕心瑞[2] 李江龙[2] 袁向春[2] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2011年第6期74-77,116,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家重大专项"碳酸盐岩油田开发关键技术"(2008ZX05014)

摘　　要：裂缝性油藏裂缝表征及数值模拟是当前油田开发领域研究的难点和热点。为了克服连续性介质模型在裂缝描述和计算效率上的缺点,采用随机生成的离散裂缝网络进行裂缝性油藏数值模拟。首先应用地质统计学方法随机生成与实际裂缝在统计意义上等效的裂缝网络,并对其简化物理模型进行几何离散;然后通过计算不同维数控制体单元之间的传导系数,建立基于控制体积有限差分方法的油—水两相流动的数值计算格式;最后通过算例验证了该方法理论与算法的正确性。该方法对裂缝进行显式地降维处理,提高了网格生成效率,缩短了计算时间。Fracture characterization and numerical simulation of fracture reservoir are difficult and hot points in current research.To avoid the defects of fracture description and computational efficiency of continuous model,we use discrete fracture network for fractured reservoir numerical simulation in this paper,the method simplifies fracture by using (n-1)-dimensional cells in an n-dimensional domain,which has greatly improved the computational efficiency.In this paper,we firstly generate the equivalent fracture in the statistical sense using geostatistical method,and then discretize the simplified physical model.Then,through the calculation of transmissibility of different dimensions,the volume cells are controlled to establish the numerical discrete scheme of oil-water two-phase flow based on the volume control finite difference method.This theory and algorithms are well verified by the field application.

关 键 词：裂缝性油藏 离散裂缝网络 控制体积有限差分 两相流 数值模拟 

分 类 号：TE319[石油与天然气工程—油气田开发工程]