Full scale, microscopically resolved tomographies of sandstone and carbonate rocks augmented by experimental porosity and permeability values

<strong>About the Data</strong> We report a dataset containing full-scale, three-dimensional images of rock plugs for application in digital rock and capillary network analysis. Specifically, we have acquired microscopically resolved tomography datasets of 18 cylindrical sandstone and carbonate rock samples having lengths of 25.4 mm and diameters of 9.5 mm, respectively. The rock plug samples measured in this work have porosity and permeability values ranging from 8% to 30% and 0.4 mD to above 5D, respectively. <br> <strong>Dataset Structure</strong> Researchers interested in using this dataset will find five different volume types and formats for each sample. The suffix inside the parenthesis designates the naming scheme used for the dataset files: <br> <strong>Full Frame</strong> <em><strong>(_grayscale_full</strong></em><strong>):</strong> Data obtained from the reconstruction of the µCT projections. During reconstruction, the volume edges are removed but the largest inscribed parallelepiped within the plug is retained, thus leading to different sized parallelepipeds. <strong>Standard</strong> <em><strong>(_grayscale_standard</strong></em><strong>):</strong> Volume cropped into a standard size of 2500x2500x7500 voxels. <strong>Cropped</strong> <strong>cubes (_grayscale_ROI-X) :</strong> 2500x2500x2500 voxel cubes extracted from the standard volume. The X designates the number of the cube, with values ranging from 1 to 3, cut top-down from the parallelepiped. <strong>Filtered cubes (_grayscale_filtered_ROI-X):</strong> Data obtained from the grayscale cubes through the application of contrast enhancement and noise reduction filters. The X designates the number of the cube, with values ranging from 1 to 3, cut top-down from the parallelepiped. <strong>Binarized cubes (_binary_ROI-X):</strong> Binary image data obtained from the filtered grayscale cubes. Each grayscale cube was segmented at threshold level calculated using the Multi-Otsu algorithm with a number of classes set to three. The X designates the number of the cube, with values ranging from 1 to 3, cut top-down from the parallelepiped. Alongside the volumes described above, the following supporting information is also provided: <strong>HDR file:</strong> File containing the cube size information for each sample. <em><strong>Dataset_Information.xlsx:</strong></em> File containing the naming convention used for all files as well as possible name changes that may happen during file decompression. This file also includes all acquisition and reconstruction parameters for each of the measurements encompassed in this work. <strong>qrm_10w__ir_rec_tra_(horizontal/vertical).raw: </strong>Data obtained from a standard microCT Bar pattern (NanoPhantom, QRM) on its horizontal/vertical silicon target (for more information, please see: https://www.qrm.de/en/products/micro-ct-bar-pattern-phantoms-airnano-customized?downloadfile=1701&amp;type=3451&amp;cHash=b0f142fb5d4e64ceeb84d57e6bafb08b). These files can be used for estimating the spatial resolution of the measurements. <br> File Naming The <strong>Dataset_Information.xlsx</strong> file contains the file naming scheme for each file type of each sample. <br> After extracting the compressed files from the original <strong>.tar.bz2 </strong>formats, the filename may change. Please refer to the table in case there is any problems identifying the files. <br> Further Information For further information on the methods used in this work, please check our related research paper at: https://www.nature.com/articles/s41597-023-02259-z <br>

**数据集说明**
本数据集包含用于数字岩石及毛细管网络分析的全尺寸三维岩芯图像。具体而言，我们采集了18个圆柱形砂岩和碳酸盐岩岩芯样品的显微分辨率断层扫描数据集，这些样品的长度为25.4 mm，直径为9.5 mm。本次研究中的岩芯样品孔隙度范围为8%~30%，渗透率范围为0.4 mD至5D以上。

**数据集结构**
使用本数据集的研究人员可获取每个样品的5种不同体数据类型与格式。括号内的后缀为数据集文件的命名规则标识：
**全视场体数据（_grayscale_full）**：该数据由显微CT（microCT）投影重建得到。重建过程中移除了体数据边缘，但保留了岩芯内最大内接平行六面体，因此各体数据的平行六面体尺寸存在差异。
**标准体数据（_grayscale_standard）**：将体数据裁剪为统一尺寸2500×2500×7500体素。
**裁剪立方体（_grayscale_ROI-X）**：从标准体数据中提取的2500×2500×2500体素立方体。其中X代表立方体编号，取值为1至3，沿平行六面体自上而下依次裁切。
**滤波立方体（_grayscale_filtered_ROI-X）**：对灰度立方体应用对比度增强与降噪滤波后得到的数据。X代表立方体编号，取值为1至3，沿平行六面体自上而下依次裁切。
**二值化立方体（_binary_ROI-X）**：由滤波后的灰度立方体转换得到的二值图像数据。每一个灰度立方体均采用多类Otsu算法（Multi-Otsu algorithm）进行阈值分割，分类数设置为3。X代表立方体编号，取值为1至3，沿平行六面体自上而下依次裁切。

除上述体数据外，本数据集还包含以下辅助信息：
**HDR文件**：包含每个样品的立方体尺寸信息。
**Dataset_Information.xlsx**：包含所有文件的命名规范，以及文件解压过程中可能出现的文件名变更情况。该文件同时收录了本次研究中所有测量项目的采集与重建参数。
**qrm_10w__ir_rec_tra_(horizontal/vertical).raw**：该文件为标准显微CT条形模体（NanoPhantom, QRM）在水平/垂直硅靶上的扫描数据（详细信息请参见：https://www.qrm.de/en/products/micro-ct-bar-pattern-phantoms-airnano-customized?downloadfile=1701&type=3451&cHash=b0f142fb5d4e64ceeb84d57e6bafb08b），可用于估算本次测量的空间分辨率。

**文件命名规则**
**Dataset_Information.xlsx**文件包含了每个样品各类文件的命名方案。
从原始.tar.bz2压缩格式解压文件后，文件名可能发生变更。若出现文件识别异常，请参考该文件内的表格信息。

**补充说明**
如需了解本次研究使用的方法详情，请查阅相关研究论文：https://www.nature.com/articles/s41597-023-02259-z