MEASURING GAS CONTENT OF THE NATURAL GAS HYDRATES IN SEDIMENTS
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摘要: 建立了沉积物中水合物含气量的测定方法;测定了人工松散沉积物中甲烷水合物、南海神狐海域及祁连山冻土区天然气水合物样品的含气量;计算了样品的表观水合指数(水与气体的摩尔比);探讨了水合物含气量的影响因素。测试结果表明,人工甲烷水合物样品表观水合指数与晶体水合指数相近,样品中水合物的浓度大,含气量较高;南海神狐海域及祁连山冻土区天然气水合物样品的表观水合指数较其晶体水合指数大得多,水合物的浓度普遍较小,样品含气量较低,其主要原因是样品中含有大量孔隙水。Abstract: The vacuum volumetric method was used to determine the gas contents of both the man-made methane hydrates in various sediments and the natural gas hydrates recovered from the Shenhu area in the South China Sea and the Qilian Mountain permafrost.Apparent hydration numbers (water/gas molar ratio) of the samples were calculated,and the methods for measuring gas content from the gas hydrate samples discussed.The experimental results show that the synthetic methane hydrates have small apparent hydration numbers which are close to the crystal hydration number.The pure hydrate concentration of the samples as well as the gas contents is high.However,the apparent hydration numbers of the samples from the Shenhu area and Qilian Mountain permafrost are generally low,but much higher than their crystal hydration number.In these samples,both the pure hydrate concentration and gas contents are low due to the high amount of pore water in the samples.
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Key words:
- natural gas hydrates /
- gas content /
- apparent hydration number /
- crystal hydration number
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[1] Technology and Methodology
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