基于数字岩心技术研究低渗砂岩渗流特征  

Study on seepage characteristics of low permeability sandstone core using digital core technology

作　　者：王春生[1] 刘洋[1] 孙启冀[1] 张凯[1] 梁超[1] 

机构地区：[1]东北石油大学石油工程学院,大庆163318

出　　处：《物探化探计算技术》2017年第4期573-578,共6页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：黑龙江省创新训练项目(201610220047);东北石油大学优秀科研人才培育基金(SCXHB201602)

摘　　要：以传统岩石物理实验研究低孔、低渗、高复杂性孔隙结构储层的宏观岩石物理性质,不仅成本高、周期长、误差大且难以定量研究储层微观因素对岩石物理属性的影像规律。通过Micro-CT扫描与高级成像处理技术,构建与真实岩心相等价的精确代表性孔隙空间模型,利用Avizo-XLab求解器数值模拟计算以N-S为控制方程的孔隙流体流动及以达西定律计算岩石渗流参数。通过计算结果的可视化处理,以三维流线展示孔隙空间流体流动,以高度梯度图展示孔隙压力分布场,使模拟结果清晰直观。研究表明,基于数字平台仿真孔隙微流动及测量岩石渗流参数具有高可信度。该研究方式弥补了传统岩石物理实验的不足,为数字化研究岩石物理属性提供借鉴。When we adopt the traditional rock physics experiments to study the macroscopic petrophysical properties of low porosity,low permeability and high complexity pore structure reservoirs,there will be such disadvantages as high cost,long cycle,large error of image,as well as the difficulty on how to quantitatively study the microscopic factors in reservoir influence rock physical properties.Through Micro-CT scanning and advanced imaging processing technology,an accurate representative pore space model equivalent to true core is constructed.In addition,we use numerical simulation of Avizo-XLab solver to calculate the flow of pore fluid with N-S as control equation and adopt Darcy＇s to calculate the parameter of rock seepage.Through the visualization of the results,the pore-space fluid flow is displayed in a three-dimensional streamline,and the pore pressure distribution field is displayed with a high gradient,all these make the simulation result clear and intuitive.The research shows that the numerical simulation based on the digital platform has a high credibility in the micro flow of pore fluid and the measurement of rock seepage parameters.This paper makes up the deficiency of the traditional rock physics experiment,and providing a new method for digital research on rock physical properties.

关 键 词：岩石物理实验 微观因素 Micro-CT扫描 孔隙微流动 岩石渗流参数 

分 类 号：TE135.4[石油与天然气工程—油气勘探]