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Thermal Conductivity of Frozen Sediments Containing Self-Preserved Pore Gas Hydrates at Atmospheric Pressure: An Experimental Study

机译：在大气压下含有自保存孔气气水合物的冷冻沉积物的导热系数：实验研究

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The paper presents the results of an experimental thermal conductivity study of frozen artificial and natural gas hydrate-bearing sediments at atmospheric pressure (0.1 MPa). Samples of hydrate-saturated sediments are highly stable and suitable for the determination of their physical properties, including thermal conductivity, due to the self-preservation of pore methane hydrate at negative temperatures. It is suggested to measure the thermal conductivity of frozen sediments containing self-preserved pore hydrates by a KD-2 needle probe which causes very little thermal impact on the samples. As shown by the special measurements of reference materials with known thermal conductivities, the values measured with the KD-2 probe are up to 20% underestimated and require the respective correction. Frozen hydrate-bearing sediments differ markedly in thermal conductivity from reference frozen samples of the same composition but free from pore hydrate. The difference depends on the physical properties of the sediments and on changes in their texture and structure associated with the self-preservation effect. Namely, it increases proportionally to the volumetric hydrate content, hydrate saturation, and the percentage of water converted to hydrate. Thermal conductivity is anisotropic in core samples of naturally frozen sediments that enclose visible ice-hydrate lenses and varies with the direction of measurements with respect to the lenses. Thermal conductivity measurements with the suggested method provide a reliable tool for detection of stable and relict gas hydrates in permafrost.
机译：本文介绍了在大气压下冷冻人工和天然气水合物沉积物的实验导热性研究的结果（0.1MPa）。水合物饱和沉积物的样品是高度稳定的，并且适合于测定其物理性质，包括导热性，由于在负温度下的孔甲烷水合物的自我保存。建议测量含有KD-2针探针的含有自保存孔水合物的冷冻沉积物的导热率，这导致对样品的热撞击很小。如具有已知热导体的参考材料的特殊测量所示，用KD-2探针测量的值高达20％低估并要求各自的校正。冷冻水合物沉积物在相同组合物的参考冷冻样品中具有显着的导热率，但不含孔隙水合物。差异取决于沉积物的物理性质以及与自我保存效果相关的纹理和结构的变化。即，它与体积水合物含量，水合物饱和度和转化为水合物的水百分比成比例地增加。热导率在天然冷冻沉积物的核心样品中是各向异性的，其包围可见的冰水合物透镜并随着相对于镜片的测量方向而变化。用建议的方法的导热率测量提供了一种可靠的工具，用于检测多年冻土中的稳定和依赖水合物水合物。

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