三维数字岩心技术岩石物理应用研究进展

三维数字岩心可在孔隙尺度上对岩石的微观结构进行精细表征,以数字岩心为载体的岩石微观结构分析与岩石物理属性模拟研究已成为岩石物理分析的重要发展方向之一.本文从数字岩心建模、数字岩心图像分析及岩石物理属性模拟三个方面对数字岩心技术进行了介绍.将数字岩心技术在岩石物理领域的应用分为两大类:基于三维数字图像的直接分析和基于三维数字岩心的岩石物理属性数值模拟.通过三维图像分析可获得孔隙结构、矿物成分、粒度分布等信息;通过岩石物理属性模拟可以研究储层岩石电性、弹性、渗流和核磁共振特征.多种手段相结合建立多尺度、多组分数字岩心,突破分辨率与样品尺度的矛盾限制是数字岩心技术未来的发展趋势.数字岩心技术已发展成为岩石物理实验的重要组成部分,如何将孔隙尺度得到的岩石物理参数升尺度到数字井筒、数字油藏中是数字岩心技术发展亟需解决的难题.

Research advance of petrophysical application based on digital core technology

The three-dimensional digital core reflects the microscopic pore structure of the rock more realistically on the pore scale.The rock structure analysis and petrophysical numerical simulation based on digital core have become one of the important directions of petrophysical analysis.This paper introduces digital core technology from three aspects:digital core reconstruction,digital core image analysis and petrophysical property simulation.The application of digital core technology in the field of petrophysics is divided into two categories:direct analysis based on 3D digital images and numerical simulation of petrophysical properties based on 3D digital cores.The pore structure,mineral composition,grain size distribution and other information can be obtained through image analysis.The rock electrical,elastic,percolation characteristics and nuclear magnetic resonance characteristics can be simulated by rock physical numerical simulation.The combination of multiple methods to construct multiscale,multi-component digital cores and overcome the contradiction between resolution and sample size is the development trend of digital core technology.Digital core technology has developed into an important part of petrophysical experiments.How to upscale the petrophysical parameters obtained from the pore scale into digital wellbore and digital reservoirs is an urgent problem to be solved in the development of digital core technology.