基于三维X射线显微镜的孔隙性砂岩中变形带微观结构解析

孔隙性砂岩中变形带对揭示其相关地质作用过程和工程应用具有重要的意义，而其微观结构是其相关科学与工程研究的关键点。常规的岩石微观结构分析手段对于全面解析岩石内部的微观结构具有一定的局限性，而近年发展起来的三维X射线显微成像技术可以无损地获得岩石内部微米尺度的三维精细数字化图像，是建立岩石微观结构并对其进行解析的有效手段。通过三维X射线显微镜对孔隙性砂岩中变形带扫面，建立了高分辨率三维微观结构图像，利用高密度切片图像，对其微观结构特征进行解析。根据变形带微观产出状带和颗粒破碎过程的解析，建立颗粒破碎-破碎颗粒与残余破碎颗粒重新排列-局部颗粒破碎带-弱颗粒破碎变形带-强颗粒破碎变形带-强弱颗粒破碎变形带相间排列-簇状变形带的完整时间发育序列。

Microstructure Analysis of Deformation Band in Porous Sandstone Based on Threedimensional X-ray Microscope

Deformation bans in porous sandstones is of great significance in revealing their related geological processes and engineering applications. Its microstructure is the key point of its related scientific and engineering research. Conventional methods of rock micro structural analysis have some limitations in comprehensively analyzing the internal microstructures of rocks. Three-dimensional X-ray micro-imaging technology developed in recent years can acquire three-dimensional fine digital images of micro-scale inside rocks nondestructively. It is an effective means to establish and analyze rock microstructures. High resolution three-dimensional micro structural image of deformation band in porous sandstones was established by scanning the deformation band with three-dimensional X-ray microscopy. The micro structural characteristics of deformation band in porous sandstones were analyzed by using continuous slice images. Based on the analysis of micro-occurrence zones and particle breaking process of deformation band, a complete time series of grain breaking-broken particles and residual broken particles rearrangement-local particle breaking zones-weak particle breaking deformation zones-strong particle breaking deformation zones-strong and weak particle breaking deformation zones-cluster deformation zones was established.