论文标题
水分含量变化下的Berea砂岩的纳米尺度变形
Nanometer-Scale Deformations of Berea Sandstone under Moisture Content Variations
论文作者
论文摘要
砂岩机械稳定性是涉及砂岩地质储层中二氧化碳注射的项目的关键问题，以进行长期存储。我们开发了一种实时测量砂岩变形的方法。我们证明了Berea砂岩在水合时会随着10^（-4）的相对变形而改变尺寸。如果水分含量增加，砂岩样品将显示出延伸，如果水分含量减少，则样品会收缩。我们还发现，在接触水后，砂岩立即暂时收缩几秒钟，然后开始缓慢的延伸，并继续持续到大约一半的液体蒸发。当样品暴露于丙酮，矿物烈酒或真空油时，也观察到了这种收缩。结果是使用高分辨率纳米定位器技术获得的，在独立的实验中，使用CODA波干涉测定法确认了结果。
Sandstone mechanical stability is of key concern in projects involving injections of CO2 in sandstone geological reservoirs, for the purpose of long-term storage. We developed a method to measure nanometer-scale deformations of sandstones in real time. We demonstrate that Berea sandstone, when hydrated, changes dimensions with a relative deformation of the order of 10^(-4). If the moisture content increases, sandstone samples exhibit an extension and if the moisture content decreases then the samples shrink. We also discover that, immediately after exposure to water, the sandstone temporarily shrinks, just for a few seconds, after which a slow extension begins, and continues until about half of the fluid evaporates. Such shrinkage followed by an extension has been observed also when the sample was exposed to acetone, Mineral Spirits or Vacuum Oil. The results are obtained using a high-resolution nano-positioner technique and, in independent experiments, confirmed using the technique of coda wave interferometry.
