Digital rock physics and laboratory considerations on a high-porosity volcanic rock
Digital rock physics and laboratory considerations on a high-porosity volcanic rock
复制标题
DOI：
10.1038/s41598-020-62741-1
复制
发表时间：
2020-03
影响因子：
4.6
通讯作者：
Laura L. Schepp;B. Ahrens;M. Balcewicz;M. Duda;M. Nehler;Maria Osorno;D. Uribe;H. Steeb;B. Nigon;Ferdinand Stöckhert;D. Swanson;Mirko Siegert;M. Gurris;E. Saenger
中科院分区：
文献类型：
--
作者：
Laura L. Schepp;B. Ahrens;M. Balcewicz;M. Duda;M. Nehler;Maria Osorno;D. Uribe;H. Steeb;B. Nigon;Ferdinand Stöckhert;D. Swanson;Mirko Siegert;M. Gurris;E. Saenger
数字岩石物理学将微层析成像与有效材料特性的高级数值模拟相结合。它用于补充实验室调查，目的是更深入地了解与运输和有效机械性能有关的相关物理过程。我们将数字岩石物理学应用于网纹岩，这是一种天然矿物，与合成的开孔泡沫有很强的相似性。我们认为网状物是高孔率材料的端部构件，具有高的刚性和脆性。对于这种特定的材料，流体力学实验是非常困难的。网纹岩是在激烈的夏威夷喷泉活动中形成的一种火山碎屑岩。蜂窝状的气泡网络由玻璃丝支撑，形成孔隙率超过80%的结构。将实验结果与数值结果和理论估算相比较，我们证明了原位表征在有效材料性质研究方面的巨大潜力。我们表明，目前为止应用于常规岩石的数字岩石物理流程对高孔率岩石产生了合理的结果，并可应用于具有类似性质的泡沫类材料。数值测定的孔隙率、有效弹性性质、导热系数和渗透率与需要非常高的实验工作量的实验结果吻合得很好。
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. We apply digital rock physics to reticulite, a natural mineral with a strong analogy to synthetic open-cell foams. We consider reticulite 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. Reticulite 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%. Comparing experimental with numerical results and theoretical estimates, we demonstrate the high potential of in situ characterization with respect to the investigation of effective material properties. We show that a digital rock physics workflow, so far applied to conventional rocks, yields reasonable results for high-porosity rocks and can be adopted for fabricated foam-like materials with similar properties. Numerically determined porosities, effective elastic properties, thermal conductivities and permeabilities of reticulite show a fair agreement to experimental results that required exeptionally high experimental efforts.