Digital rock physics and laboratory considerations on a high-porosity volcanic rock: micro-XRCT data sets

Reticulite (high-porosity volcanic rock) is a pyroclastic rock formed during intense Hawaiian fountaining events. The honeycombed network of bubbles is supported by glassy threads and forms a structure with a porosity of more than 80 %. It is an end-member for high-porosity materials with a high stiffness and brittleness. For this specific material, hydro-mechanical experiments are very difficult to perform. Therefore, digital rock physics plays an important role. Digital rock physics combines microtomographic imaging with advanced numerical simulations of effective material properties. It is used to complement laboratory investigations with the aim to gain a deeper understanding of relevant physical processes related to transport and effective mechanical properties. Two micro-XRCT data sets of two dry cubic reticulite samples under ambient conditions scanned at two different resolutions are provided ("Reticulite-01_AxMF01.rar" and "Reticulite_03_AxMF01.rar"). Further, for each of this data sets a subvolume with 400 x 400 x 400 voxels was extracted and segmented (binarized) into skeleton and pore space which are also provided ("Segmented_subsamples.rar") and can directly be used for digital rock physics. A third cubic reticulite sample was saturated with distilled water in three steps (500 microliters, 250 microliters and 250 microliters) with help of a pipette which was not removed during the CT scans. After each injection a scan was performed. The data sets are named according to the complete injected fluid volumes (“Reticulite-AxHP_wet_500ul.rar”, “Reticulite-AxHP_wet_750ul.rar” and “Reticulite-AxHP_wet_1ml.rar”).

网状岩（高孔隙率火山岩）是在剧烈的夏威夷喷发事件中形成的火山碎屑岩。其蜂窝状气泡网络由玻璃纤维支撑，形成孔隙率超过80%的结构。网状岩是高孔隙率材料中具有高刚度和脆性的端元。对于这种特定材料，进行水力-机械实验极为困难。因此，数字岩石物理在研究中扮演着至关重要的角色。数字岩石物理将显微断层扫描与有效材料属性的先进数值模拟相结合。其用途在于补充实验室研究，旨在更深入地理解与传输和有效力学性质相关的物理过程。提供了两个干立方网状岩样本在环境条件下的两种不同分辨率下的微-XRCT数据集（“Reticulite-01_AxMF01.rar”和“Reticulite_03_AxMF01.rar”）。此外，对于每个数据集，均提取了一个包含400 x 400 x 400体素的三维子体积，并将其分割（二值化）为骨架和孔隙空间，这些也被提供（“Segmented_subsamples.rar”），可以直接用于数字岩石物理。第三个立方网状岩样本在三个步骤中（500微升、250微升和250微升）被蒸馏水饱和，使用滴管进行饱和，滴管在CT扫描过程中未被移除。在每次注水后均进行了一次扫描。数据集按照完全注入的液体体积命名（“Reticulite-AxHP_wet_500ul.rar”、“Reticulite-AxHP_wet_750ul.rar”和“Reticulite-AxHP_wet_1ml.rar”）