An experimental study on dielectric properties of hydrate sediments in radar wave propagation
DU Bing-rui1,2, BAI Dawei1,2, PEI Fagen1,2, QIU Gen'gen1,2, FANG Hui1,2, FU Shun3
1. Laboratory of Geophysical EM Probing Techno-logies, MLR, Langfang, Hebei 065000, China; 2. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang, Hebei 065000, China; 3. Chengdu University of Technology, Chengdu, Sichuan 610059, China
Abstract：As an effective way to detect hydrate in permafrost regions,the dielectric constant can be used to investigate the relations between dielectric constant characteristics of sandstone hydrate sediments and the hydrate saturation as well as the surrounding rock granularity with physical simulation tests,which is of great significance for the hydrate exploration and development.Soil samples of methane hydrate and tetrahydrofuran (THF) hydrate with different granularities of quartz sand framework are obtained through sample preparation in laboratory and their dielectric constants are analyzed.The following phenomena are observed:A.Under different granularities of quartz sands,the dielectric constants of two kinds of methane hydrate sediments decrease with the increase of saturation; B.Under the condition of same saturation,the dielectric constant of methane hydrate sediments with small granularity of surrounding rock is larger,which is inferred to be caused by the unreacted water in the pores; C.Under the same granularity of quartz sands,the changing trend of dielectric constant with the saturation in THF hydrate sediments is the same as that in methane hydrate sediments i.e.,both dielectric constant decreases with the increase of saturation; D.Under the condition of the same saturation,the dielectric constant of hydrate sediments is overall larger than that of THF hydrate,which is inferred to be caused by the combination of gas-phase factors in the pores of methane hydrate sediments and the presence of unreacted water.
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