岩石三维微观结构定量研究方案与应用实例

微观CT技术可以提供微米(或更小)分辨率的三维高精度数字图像,为研究岩石内部结构提供了强有力的技术支持。微观CT数据的定量分析主要包含三个方面:(1)图像数据中岩石微观结构的定量表征;(2)流体力学代表性体元的确定和流体力学参数计算;(3)固体力学代表性体元的确定及固体力学参数计算。简要介绍了三个方面定量分析的实施方案,并将可视化技术作为数据分析的辅助手段。给出了糜棱岩、砂岩和灰岩三个不同样品的计算分析实例。岩石微观三维CT数据量大,尤其是包含了时间序列的四维CT数据量更为巨大,其中包含了丰富且独特的信息,处理过程复杂多变,构成了地学大数据的一个重要组成部分。

Quantitative analysis of 3D microtomographic data of rocks and its applications in geosciences

Microtomography provides digital images at microns or sub-micron resolution and enables the study of rock microstructures. Quantitative analyses of microtomographic data mainly include three parts: (1) characterizing rock microstructures; (2) determining representative volume element (RVE) size and pore-scale fluid simulation for extracting fluid transport properties; and (3) determining mechanical RVE size and extracting mechanical properties. Here, we briefly introduced the implementing schemes of quantitative analyses of microtomography, using visualization methods to assistant data analyses. We analyzed three typical samples—a mylonite, a synthetic sandstone and a carbonate sample-to illustrate the procedure and validity of our method. Microtomographic data are voluminous, vary at different processing stages, and contain plentiful yet specific information, thus they are important components of geoscience big-data.