海底多组分水合物分解气好氧氧化实验研究
发布时间：2018-11-04 21:24
【摘要】：海洋区域蕴藏了丰富的天然气水合物资源,是地球上巨大的碳储库之一。当海洋环境发生变化时,部分水合物会分解释放出大量天然气,其向上运移过程中会发生厌氧或好氧氧化反应,从而减少由海洋向大气的碳排放量,起到消耗截流的作用。本文选取含烷烃好氧氧化菌的海底沉积物进行了水合物分解气的微生物好氧降解模拟实验,实验中用混合气(C_1+C_2+C_3)来模拟多组分水合物分解气。实验结果显示,在微生物作用下烃类混合气发生好氧氧化降解反应至消耗殆尽,反应优先顺序为C_1C_2C_3,降解速率C_1C_2C_3。且随着烃类组分含量的减少,其碳氢同位素组成发生了微生物降解分馏效应,并呈现出不同程度的富集趋势。C_1、C_2和C_3的碳同位素富集变化量分别为71.05‰、12.03‰和4.61‰,碳同位素分馏系数(εC)的平均值分别为-11.219‰、-2.951‰和-1.539‰;氢同位素富集变化量分别为368.64‰、156.00‰和111.97‰,氢同位素分馏系数(εH)的平均值分别为-56.092‰、-99.696‰和-73.303‰。可见,三者的碳位素富集程度C_1C_2C_3,而氢同位素富集程度C_2C_3C_1。此外,水合物分解气在微生物降解过程中气体成分组成及碳氢同位素特征发生了改变,对判别气体成因起到一定的干扰作用,因此,利用分解溢出气体样品进行气体溯源时需要适当考虑这一影响因素。
[Abstract]:The marine area contains abundant natural gas hydrate resources and is one of the huge carbon reservoirs on the earth. When the marine environment changes, some hydrates will decompose and release a large amount of natural gas, and anaerobic or aerobic oxidation will occur during their upward migration, which will reduce the carbon emissions from the ocean to the atmosphere and play the role of consumption and closure. In this paper, the microbial aerobic degradation simulation experiment of hydrate decomposition gas was carried out in seabed sediments containing alkane aerobic bacteria. In the experiment, the multicomponent hydrate decomposition gas was simulated by C _ 1C _ S _ 2C _ 3 (C _ 1C _ S _ 2C _ 3). The experimental results show that the aerobic oxidation degradation reaction of hydrocarbon mixture under the action of microorganism is exhausted, the priority of the reaction is C1C _ 2C _ 3 and C _ 1C _ 2C _ 3, and the degradation rate is C _ 1C _ 2C _ 2C _ 3. With the decrease of hydrocarbon composition, microbial degradation fractionation effect occurred in the hydrocarbon isotopic composition, and the enrichment trend of C _ 1C _ 2 and C _ 3 was 71.05 鈥，
本文编号：2311178
[Abstract]:The marine area contains abundant natural gas hydrate resources and is one of the huge carbon reservoirs on the earth. When the marine environment changes, some hydrates will decompose and release a large amount of natural gas, and anaerobic or aerobic oxidation will occur during their upward migration, which will reduce the carbon emissions from the ocean to the atmosphere and play the role of consumption and closure. In this paper, the microbial aerobic degradation simulation experiment of hydrate decomposition gas was carried out in seabed sediments containing alkane aerobic bacteria. In the experiment, the multicomponent hydrate decomposition gas was simulated by C _ 1C _ S _ 2C _ 3 (C _ 1C _ S _ 2C _ 3). The experimental results show that the aerobic oxidation degradation reaction of hydrocarbon mixture under the action of microorganism is exhausted, the priority of the reaction is C1C _ 2C _ 3 and C _ 1C _ 2C _ 3, and the degradation rate is C _ 1C _ 2C _ 2C _ 3. With the decrease of hydrocarbon composition, microbial degradation fractionation effect occurred in the hydrocarbon isotopic composition, and the enrichment trend of C _ 1C _ 2 and C _ 3 was 71.05 鈥，
本文编号：2311178
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