Grayscale REV Analysis
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The data provided here is used to investigate the representative elementary volume (REV) size directly from grayscale micro-CT images of porous media of sandstone and carbonate. Three datasets are provided per sample: 16-bit grayscale image, 8-bit grayscale image, and segmented image. The re-quantization of a 16-bit grayscale image to 8-bit is carried out using ImageJ. The choice of intensities used carrying out this operation is provided in the supplementary information of the related publication. This dataset includes: 1) Sand pack Image size: 600^3 voxels Resolution: 5.2 micrometer Imaging Facility Used: Tyree x-ray imaging (https://www.engineering.unsw.edu.au/minerals-energy-resources/facilities/tyree-x-ray) Porosity: 35.4% Average Permeability: 48.72 D 2) Bentheimer Sandstone Image size: 600^3 voxels Resolution: 5.4 micrometer Imaging Facility Used: Tyree x-ray imaging (https://www.engineering.unsw.edu.au/minerals-energy-resources/facilities/tyree-x-ray) Porosity: 23.9% Average Permeability: 4.27 D 3) Fieldstone Image size: 500^3 voxels Resolution: 4.98 micrometers Data Source: This is a subset of the dataset provided at https://www.digitalrocksportal.org/projects/297 Porosity: 20% Average Permeability: 0.993 D 4) Ketton Carbonate Image size: 600^3 voxels Resolution: 5 micrometer Data Source: This is a subset of the dataset provided at https://www.digitalrocksportal.org/projects/167 Porosity: 10% Average Permeability: 1.27 D
本数据集用于直接从砂岩与碳酸盐岩多孔介质的灰度显微CT(micro-CT)图像中求取表征体元(representative elementary volume, REV)尺寸。每个样本提供三类数据集:16位灰度图像、8位灰度图像以及分割图像。将16位灰度图像重量化为8位图像的操作通过ImageJ软件完成,该操作所采用的强度阈值选取规则详见相关发表论文的补充材料。 本数据集包含以下四类样本: 1) 砂充填体(Sand pack) 图像尺寸:600³体素(voxel) 成像分辨率:5.2微米 成像设备:泰瑞X射线成像系统(Tyree x-ray imaging),https://www.engineering.unsw.edu.au/minerals-energy-resources/facilities/tyree-x-ray 孔隙度:35.4% 平均渗透率:48.72达西(D) 2) 本特海姆砂岩(Bentheimer Sandstone) 图像尺寸:600³体素 成像分辨率:5.4微米 成像设备:泰瑞X射线成像系统(链接同上) 孔隙度:23.9% 平均渗透率:4.27达西 3) 菲尔德斯通样本(Fieldstone) 图像尺寸:500³体素 成像分辨率:4.98微米 数据来源:本数据集为https://www.digitalrocksportal.org/projects/297 发布的数据集的子集 孔隙度:20% 平均渗透率:0.993达西 4) 基顿碳酸盐岩(Ketton Carbonate) 图像尺寸:600³体素 成像分辨率:5.0微米 数据来源:本数据集为https://www.digitalrocksportal.org/projects/167 发布的数据集的子集 孔隙度:10% 平均渗透率:1.27达西




