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首页> 外文期刊>Geophysical Prospecting >Micro X-Ray computed tomography imaging and ultrasonic velocity measurements in tetrahydrofuran-hydrate-bearing sediments
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Micro X-Ray computed tomography imaging and ultrasonic velocity measurements in tetrahydrofuran-hydrate-bearing sediments

机译：含四氢呋喃水合物的沉积物的显微X射线计算机断层摄影成像和超声速度测量

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Naturally occurring gas hydrates contain significant amounts of natural gas that might be produced as an energy resource in the foreseeable future. Thus, it is necessary to understand the pore-space characteristics of hydrate reservoirs, particularly the pore-scale distribution of the hydrate and its interaction with the sediment. Four end-member models for hydrate distribution in the pore space are pore filling, sediment-frame component, envelope cementing, and contact cementing. The goal of this study is to compare the models with pore-scale hydrate distributions obtained in laboratory-formed hydrates. Our results verify hydrate pore-scale distributions by direct, visual observations that were previously implied by indirect, elastic property measurements. Laboratory measurements were conducted using tetrahydrofuran as a guest molecule since tetrahydrofuran hydrate can be used as a proxy for naturally occurring hydrates. We performed micro X-ray computed tomography to obtain information about the distribution of hydrate in the pore space of synthetic sediment (glass beads). We also made ultrasonic velocity measurements on the same samples. Micro X-ray computed tomography images and ultrasonic velocity measurements both indicate that the tetrahydrofuran hydrate forms in the pore space with a part of the hydrate bridging the grains without touching the grain surfaces. These hydrate-bearing sediments appear to follow a pore-filling model with a portion of the hydrate becoming a load-bearing part of the sediment frame.
机译：天然存在的天然气水合物含有大量天然气，在可预见的将来可能会作为能源生产。因此，有必要了解水合物储层的孔隙空间特征，特别是水合物的孔隙尺度分布及其与沉积物的相互作用。孔隙空间中水合物分布的四个最终成员模型是孔隙填充，沉积物框架成分，包埋固井和接触固井。这项研究的目的是将模型与实验室形成的水合物中的孔尺度水合物分布进行比较。我们的结果通过直接的，直观的观察来验证水合物的孔尺度分布，而这种观察先前被间接的，弹性的测量所暗示。由于四氢呋喃水合物可以用作天然水合物的替代物，因此使用四氢呋喃作为客体分子进行实验室测量。我们进行了X射线计算机断层扫描，以获取有关合成沉积物（玻璃珠）的孔隙空间中水合物分布的信息。我们还对相同的样品进行了超声波速度测量。显微X射线计算机断层扫描图像和超声速度测量结果均表明，四氢呋喃水合物在孔隙空间中形成，一部分水合物桥接晶粒而未接触晶粒表面。这些含水合物的沉积物似乎遵循孔隙填充模型，其中一部分水合物成为沉积物框架的承重部分。

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